endless loop

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endless loop

 
0
  #1
Oct 13th, 2009
Please help me find the endless loop and how to fix it:

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blade71(555)% showxbits_2
32
in itox, processing 32
Test Value (b div 16): 2
Value of b: 32
Value of b (# mod 16): 0
C Syntax (Toggle Plain Text) 
  1. /*
  2.  *  stubs for functions to study
  3.  *  integer-hex conversions
  4.  *
  5.  */
  6.  
  7. #include "xbits.h"
  8.  
  9. /* Helpful function to get around not being able to use strchr()
  10.  * Converts hex to decimal value
  11.  */
  12. int hex_Val(int c)
  13. {
  14.         char hex_values[] = "aAbBcCdDeEfF";
  15.         int i;
  16.         int answer = 0;
  17.  
  18.         for (i=0; answer == 0 && hex_values[i] != '\0'; i++)
  19.         {
  20.                 if (hex_values[i] == c)
  21.                 {
  22.                 answer = 10 + (i/2);
  23.                 }
  24.         }
  25.  
  26.         return answer;
  27. }
  28.  
  29. /* function represents the int n as a hexstring which it places in the
  30. hexstring array */
  31.  
  32. void itox( char hexstring[], int n)
  33.  {
  34.         printf("in itox, processing %d\n",n);
  35.         hexstring[0] = '0';
  36.         hexstring[1] = 'x';
  37.         int b,c=0, i=0, TEST = 0;
  38.         b=n;
  39.         while (b>=16)
  40.         {
  41.                 TEST = b/16;
  42.                 hexstring[i+2]=TEST;
  43.                 i++;
  44.                 printf("Test Value (b div 16): %d\n", TEST);
  45.                 printf("Value of b: %d\n", b);
  46.                 b = b%16;
  47.                 hexstring[i+2] = b;
  48.                 printf("Value of b (# mod 16): %d\n", b);
  49.                 i++;
  50.         }
  51.         while ( b>=0 && b<15 )
  52.         {
  53.                 int useless = b;
  54.                 if (hexstring[i+2]==10)
  55.                 hexstring[i+2] = 'A';
  56.                 else if (hexstring[i+2]==11)
  57.                 hexstring[i+2] = 'B';
  58.                 else if (hexstring[i+2]==12)
  59.                 hexstring[i+2] = 'C';
  60.                 else if (hexstring[i+2]==13)
  61.                 hexstring[i+2] = 'D';
  62.                 else if (hexstring[i+2]==14)
  63.                 hexstring[i+2] = 'E';
  64.                 else if (hexstring[i+2]==15)
  65.                 hexstring[i+2] = 'F';
  66.                 else
  67.                 hexstring[i+2]=hexstring[i+2];
  68.         useless--;
  69.         b=b-useless;
  70.         }
  71.         return;
  72. }
  73.  
  74. /* function converts hexstring array to equivalent integer value  */
  75. int xtoi(char hexstring[])
  76. {
  77.         printf("in xtoi, processing %s\n", hexstring);
  78.         int answer = 0;
  79.         int i = 0;
  80.         int valid = 1;
  81.         int hexit;
  82.  
  83.         if (hexstring[i] == '0')
  84.         {
  85.                 ++i;
  86.                 if (hexstring[i] == 'x' || hexstring[i] == 'X')
  87.                 {
  88.                         ++i;
  89.                 }
  90.         }
  91.         while(valid && hexstring[i] != '\0')
  92.         {
  93.                 answer = answer * 16;
  94.                 if(hexstring[i] >='0' && hexstring[i] <= '9')
  95.                 {
  96.                         answer = answer + (hexstring[i] - '0');
  97.                 }
  98.                 else
  99.                 {
  100.                         hexit = hex_Val(hexstring[i]);
  101.                         if (hexit == 0)
  102.                         {
  103.                                 valid = 0;
  104.                         }
  105.                         else
  106.                         {
  107.                         answer = answer + hexit;
  108.                         }
  109.                 }
  110.                 ++i;
  111.         }
  112.         if(!valid)
  113.         {
  114.                 answer = 0;
  115.         }
  116.  
  117.         return answer;
  118. }
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1
  #2
Oct 13th, 2009
I think first you need to simplify, so as that you can clearly follow and read it. For instance: that whole if(hexstring[i+2]==10 through 15) and then ending it with a redundantly unnecessary else hexstring[i+2]=hexstring[i+2]; , all of that could be summarized in a single line.

So crop off all the excess code and simplify; then, it should become apparent where what is happening to what.
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"I became very sensitive to what will happen to all this and all of us." -Two geniuses named Albert
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  #3
Oct 14th, 2009
I suppose you've made some mistake at while loop from line 39 to 50. Value of b can't fulfill the condition to end. This line made it
b = b%16;
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0
  #4
Oct 14th, 2009
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Originally Posted by Ineedhelpplz View Post
Please help me find the endless loop and how to fix it:



C Syntax (Toggle Plain Text) 
  1. /*
  2.  *  stubs for functions to study
  3.  *  integer-hex conversions
  4.  *
  5.  */
  6.  
  7. #include "xbits.h"
  8.  
  9. /* Helpful function to get around not being able to use strchr()
  10.  * Converts hex to decimal value
  11.  */
  12. int hex_Val(int c)
  13. {
  14.         char hex_values[] = "aAbBcCdDeEfF";
  15.         int i;
  16.         int answer = 0;
  17.  
  18.         for (i=0; answer == 0 && hex_values[i] != '\0'; i++)
  19.         {
  20.                 if (hex_values[i] == c)
  21.                 {
  22.                 answer = 10 + (i/2);
  23.                 }
  24.         }
  25.  
  26.         return answer;
  27. }
  28.  
  29. /* function represents the int n as a hexstring which it places in the
  30. hexstring array */
  31.  
  32. void itox( char hexstring[], int n)
  33.  {
  34.         printf("in itox, processing %d\n",n);
  35.         hexstring[0] = '0';
  36.         hexstring[1] = 'x';
  37.         int b,c=0, i=0, TEST = 0;
  38.         b=n;
  39.         while (b>=16)
  40.         {
  41.                 TEST = b/16;
  42.                 hexstring[i+2]=TEST;
  43.                 i++;
  44.                 printf("Test Value (b div 16): %d\n", TEST);
  45.                 printf("Value of b: %d\n", b);
  46.                 b = b%16;
  47.                 hexstring[i+2] = b;
  48.                 printf("Value of b (# mod 16): %d\n", b);
  49.                 i++;
  50.         }
  51.         while ( b>=0 && b<15 )
  52.         {
  53.                 int useless = b;
  54.                 if (hexstring[i+2]==10)
  55.                 hexstring[i+2] = 'A';
  56.                 else if (hexstring[i+2]==11)
  57.                 hexstring[i+2] = 'B';
  58.                 else if (hexstring[i+2]==12)
  59.                 hexstring[i+2] = 'C';
  60.                 else if (hexstring[i+2]==13)
  61.                 hexstring[i+2] = 'D';
  62.                 else if (hexstring[i+2]==14)
  63.                 hexstring[i+2] = 'E';
  64.                 else if (hexstring[i+2]==15)
  65.                 hexstring[i+2] = 'F';
  66.                 else
  67.                 hexstring[i+2]=hexstring[i+2];
  68.         useless--;
  69.         b=b-useless;
  70.         }
  71.         return;
  72. }
  73.  
  74. /* function converts hexstring array to equivalent integer value  */
  75. int xtoi(char hexstring[])
  76. {
  77.         printf("in xtoi, processing %s\n", hexstring);
  78.         int answer = 0;
  79.         int i = 0;
  80.         int valid = 1;
  81.         int hexit;
  82.  
  83.         if (hexstring[i] == '0')
  84.         {
  85.                 ++i;
  86.                 if (hexstring[i] == 'x' || hexstring[i] == 'X')
  87.                 {
  88.                         ++i;
  89.                 }
  90.         }
  91.         while(valid && hexstring[i] != '\0')
  92.         {
  93.                 answer = answer * 16;
  94.                 if(hexstring[i] >='0' && hexstring[i] <= '9')
  95.                 {
  96.                         answer = answer + (hexstring[i] - '0');
  97.                 }
  98.                 else
  99.                 {
  100.                         hexit = hex_Val(hexstring[i]);
  101.                         if (hexit == 0)
  102.                         {
  103.                                 valid = 0;
  104.                         }
  105.                         else
  106.                         {
  107.                         answer = answer + hexit;
  108.                         }
  109.                 }
  110.                 ++i;
  111.         }
  112.         if(!valid)
  113.         {
  114.                 answer = 0;
  115.         }
  116.  
  117.         return answer;
  118. }
C Syntax (Toggle Plain Text) 
  1.              while ( b>=0 && b<15 )

this is where its getting infinite
the value of b is always >0 according to your code

i think it works fine with the following changes
if(b>0 && b <=15)
{
if ( code
replacing 10 with 'A'
:
:
15 with 'F' goes here)
else
copy as it is.
}
i dint find the use of variables "useless" and "b", so i removed.
Minds are like parachutes - they only work when they are open
Gaiety
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0
  #5
Oct 14th, 2009
Corrected:
C Syntax (Toggle Plain Text) 
  1. void itox(char hexstring[], int n)
  2.  {
  3.         int b = 0, TEST = 0, index =0, r[100], i=0;
  4.         printf("in itox, processing %d\n",n);
  5.         hexstring[i++] = '0';
  6.         hexstring[i++] = 'x';
  7.         for (index = 0; n>=16; index++)
  8.         {
  9.         r[index] = n %16;
  10.         n = n/16;
  11.         printf("Value of n divided by 16: %d\n",n);
  12.         }
  13.         r[index] = n;
  14.         for (;index>=0;index--)
  15.         {
  16.                 if (r[index] == 0)
  17.                 {
  18.                 hexstring[i] = '0';
  19.                 i++;
  20.                 }
  21.                 else if (r[index] == 1)
  22.                 {
  23.                 hexstring[i] = '1';
  24.                 i++;
  25.                 }
  26.                 else if (r[index] == 2)
  27.                 {
  28.                 hexstring[i] = '2';
  29.                 i++;
  30.                 }
  31.                 else if (r[index] == 3)
  32.                 {
  33.                 hexstring[i] = '3';
  34.                 i++;
  35.                 }
  36.                 else if (r[index] == 4)
  37.                 {
  38.                 hexstring[i] = '4';
  39.                 i++;
  40.                 }
  41.                 else if (r[index] == 5)
  42.                 {
  43.                 hexstring[i] = '5';
  44.                 i++;
  45.                 }
  46.                 else if (r[index] == 6)
  47.                 {
  48.                 hexstring[i] = '6';
  49.                 i++;
  50.                 }
  51.                 else if (r[index] == 7)
  52.                 {
  53.                 hexstring[i] = '7';
  54.                 i++;
  55.                 }
  56.                 else if (r[index] == 8)
  57.                 {
  58.                 hexstring[i] = '8';
  59.                 i++;
  60.                 }
  61.                 else if (r[index] == 9)
  62.                 {
  63.                 hexstring[i] = '9';
  64.                 i++;
  65.                 }
  66.                 else if (r[index] == 10)
  67.                 {
  68.                 hexstring[i] = 'A';
  69.                 i++;
  70.                 }
  71.                 else if (r[index] == 11)
  72.                 {
  73.                 hexstring[i] = 'B';
  74.                 i++;
  75.                 }
  76.                 else if (r[index] == 12)
  77.                 {
  78.                 hexstring[i] = 'C';
  79.                 i++;
  80.                 }
  81.                 else if (r[index] == 13)
  82.                 {
  83.                 hexstring[i] = 'D';
  84.                 i++;
  85.                 }
  86.                 else if (r[index] == 14)
  87.                 {
  88.                 hexstring[i] = 'E';
  89.                 i++;
  90.                 }
  91.                 else if (r[index] == 15)
  92.                 {
  93.                 hexstring[i] = 'F';
  94.                 i++;
  95.                 }
  96.                 else
  97.                 {
  98.                 printf("Err %d\n", r[index]);
  99.                 }
  100.         }
  101.         return;
  102. }
xtoi is now in an endless loop during the execution; because I never end hexstring[i] with '\0'. That is the next thing I will be working on
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  #6
Oct 14th, 2009
Completed entirely:
C Syntax (Toggle Plain Text) 
  1. blade71(60)% cat xbits.c
  2. /*
  3.  *  stubs for functions to study
  4.  *  integer-hex conversions
  5.  *
  6.  */
  7.  
  8. #include "xbits.h"
  9.  
  10. /* Helpful function to get around not being able to use strchr()
  11.  * Converts hex to decimal value
  12.  */
  13. int hex_Val(int c)
  14. {
  15.         char hex_values[] = "aAbBcCdDeEfF";
  16.         int i;
  17.         int answer = 0;
  18.  
  19.         for (i=0; answer == 0 && hex_values[i] != '\0'; i++)
  20.         {
  21.                 if (hex_values[i] == c)
  22.                 {
  23.                 answer = 10 + (i/2);
  24.                 }
  25.         }
  26.  
  27.         return answer;
  28. }
  29.  
  30. /* function represents the int n as a hexstring which it places in the
  31. hexstring array */
  32. void itox(char hexstring[], int n)
  33.  {
  34.         int b = 0, TEST = 0, index =0, r[100], i=0;
  35.         printf("in itox, processing %d\n",n);
  36.         hexstring[i++] = '0';
  37.         hexstring[i++] = 'x';
  38.         for (index = 0; n>=16; index++)
  39.         {
  40.         r[index] = n %16;
  41.         n = n/16;
  42.         }
  43.         r[index] = n;
  44.         r[index+1] = '\0';
  45.         for (;index>=0;index--)
  46.         {
  47.                 if (r[index] == 0)
  48.                 {
  49.                 hexstring[i] = '0';
  50.                 i++;
  51.                 }
  52.                 else if (r[index] == 1)
  53.                 {
  54.                 hexstring[i] = '1';
  55.                 i++;
  56.                 }
  57.                 else if (r[index] == 2)
  58.                 {
  59.                 hexstring[i] = '2';
  60.                 i++;
  61.                 }
  62.                 else if (r[index] == 3)
  63.                 {
  64.                 hexstring[i] = '3';
  65.                 i++;
  66.                 }
  67.                 else if (r[index] == 4)
  68.                 {
  69.                 hexstring[i] = '4';
  70.                 i++;
  71.                 }
  72.                 else if (r[index] == 5)
  73.                 {
  74.                 hexstring[i] = '5';
  75.                 i++;
  76.                 }
  77.                 else if (r[index] == 6)
  78.                 {
  79.                 hexstring[i] = '6';
  80.                 i++;
  81.                 }
  82.                 else if (r[index] == 7)
  83.                 {
  84.                 hexstring[i] = '7';
  85.                 i++;
  86.                 }
  87.                 else if (r[index] == 8)
  88.                 {
  89.                 hexstring[i] = '8';
  90.                 i++;
  91.                 }
  92.                 else if (r[index] == 9)
  93.                 {
  94.                 hexstring[i] = '9';
  95.                 i++;
  96.                 }
  97.                 else if (r[index] == 10)
  98.                 {
  99.                 hexstring[i] = 'A';
  100.                 i++;
  101.                 }
  102.                 else if (r[index] == 11)
  103.                 {
  104.                 hexstring[i] = 'B';
  105.                 i++;
  106.                 }
  107.                 else if (r[index] == 12)
  108.                 {
  109.                 hexstring[i] = 'C';
  110.                 i++;
  111.                 }
  112.                 else if (r[index] == 13)
  113.                 {
  114.                 hexstring[i] = 'D';
  115.                 i++;
  116.                 }
  117.                 else if (r[index] == 14)
  118.                 {
  119.                 hexstring[i] = 'E';
  120.                 i++;
  121.                 }
  122.                 else if (r[index] == 15)
  123.                 {
  124.                 hexstring[i] = 'F';
  125.                 i++;
  126.                 }
  127.                 else
  128.                 {
  129.                 printf("Err %d\n", r[index]);
  130.                 }
  131.         }
  132.         return;
  133. }
  134.  
  135. /* function converts hexstring array to equivalent integer value  */
  136. int xtoi(char hexstring[])
  137. {
  138.         printf("in xtoi, processing %s\n", hexstring);
  139.         int answer = 0;
  140.         int i = 0;
  141.         int valid = 1;
  142.         int hexit;
  143.  
  144.         if (hexstring[i] == '0')
  145.         {
  146.                 ++i;
  147.                 if (hexstring[i] == 'x' || hexstring[i] == 'X')
  148.                 {
  149.                         ++i;
  150.                 }
  151.         }
  152.         while(valid && hexstring[i] != '\0')
  153.         {
  154.                 answer = answer * 16;
  155.                 if(hexstring[i] >='0' && hexstring[i] <= '9')
  156.                 {
  157.                         answer = answer + (hexstring[i] - '0');
  158.                 }
  159.                 else
  160.                 {
  161.                         hexit = hex_Val(hexstring[i]);
  162.                         if (hexit == 0)
  163.                         {
  164.                                 valid = 0;
  165.                         }
  166.                         else
  167.                         {
  168.                         answer = answer + hexit;
  169.                         }
  170.                 }
  171.                 ++i;
  172.         }
  173.         if(!valid)
  174.         {
  175.                 answer = 0;
  176.         }
  177.  
  178.         return answer;
  179. }

Desired Output:
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blade71(108)% showxbits_2
4
in itox, processing 4
in xtoi, processing 0x4Ì
4 0x4Ì 0
128
in itox, processing 128
in xtoi, processing 0x80
128 0x80 128
32
in itox, processing 32
in xtoi, processing 0x20
32 0x20 32
64
in itox, processing 64
in xtoi, processing 0x40
64 0x40 64
2312321
in itox, processing 2312321
in xtoi, processing 0x234881
2312321 0x234881 2312321
123143536523452352643
in itox, processing -1850210173
Err -1850210173
in xtoi, processing 0x234881
-1850210173 0x234881 2312321
^[[12~^[[13~^[[14~^[[12~
Where I have marked red I was wondering why I get that funny 'I'. If someone could solve this it would be greatly appreciated! Thanks guys for all your help
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  #7
Oct 15th, 2009
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Originally Posted by Ineedhelpplz View Post
Completed entirely:
C Syntax (Toggle Plain Text) 
  1. blade71(60)% cat xbits.c
  2. /*
  3.  *  stubs for functions to study
  4.  *  integer-hex conversions
  5.  *
  6.  */
  7.  
  8. #include "xbits.h"
  9.  
  10. /* Helpful function to get around not being able to use strchr()
  11.  * Converts hex to decimal value
  12.  */
  13. int hex_Val(int c)
  14. {
  15.         char hex_values[] = "aAbBcCdDeEfF";
  16.         int i;
  17.         int answer = 0;
  18.  
  19.         for (i=0; answer == 0 && hex_values[i] != '\0'; i++)
  20.         {
  21.                 if (hex_values[i] == c)
  22.                 {
  23.                 answer = 10 + (i/2);
  24.                 }
  25.         }
  26.  
  27.         return answer;
  28. }
  29.  
  30. /* function represents the int n as a hexstring which it places in the
  31. hexstring array */
  32. void itox(char hexstring[], int n)
  33.  {
  34.         int b = 0, TEST = 0, index =0, r[100], i=0;
  35.         printf("in itox, processing %d\n",n);
  36.         hexstring[i++] = '0';
  37.         hexstring[i++] = 'x';
  38.         for (index = 0; n>=16; index++)
  39.         {
  40.         r[index] = n %16;
  41.         n = n/16;
  42.         }
  43.         r[index] = n;
  44.         r[index+1] = '\0';
  45.         for (;index>=0;index--)
  46.         {
  47.                 if (r[index] == 0)
  48.                 {
  49.                 hexstring[i] = '0';
  50.                 i++;
  51.                 }
  52.                 else if (r[index] == 1)
  53.                 {
  54.                 hexstring[i] = '1';
  55.                 i++;
  56.                 }
  57.                 else if (r[index] == 2)
  58.                 {
  59.                 hexstring[i] = '2';
  60.                 i++;
  61.                 }
  62.                 else if (r[index] == 3)
  63.                 {
  64.                 hexstring[i] = '3';
  65.                 i++;
  66.                 }
  67.                 else if (r[index] == 4)
  68.                 {
  69.                 hexstring[i] = '4';
  70.                 i++;
  71.                 }
  72.                 else if (r[index] == 5)
  73.                 {
  74.                 hexstring[i] = '5';
  75.                 i++;
  76.                 }
  77.                 else if (r[index] == 6)
  78.                 {
  79.                 hexstring[i] = '6';
  80.                 i++;
  81.                 }
  82.                 else if (r[index] == 7)
  83.                 {
  84.                 hexstring[i] = '7';
  85.                 i++;
  86.                 }
  87.                 else if (r[index] == 8)
  88.                 {
  89.                 hexstring[i] = '8';
  90.                 i++;
  91.                 }
  92.                 else if (r[index] == 9)
  93.                 {
  94.                 hexstring[i] = '9';
  95.                 i++;
  96.                 }
  97.                 else if (r[index] == 10)
  98.                 {
  99.                 hexstring[i] = 'A';
  100.                 i++;
  101.                 }
  102.                 else if (r[index] == 11)
  103.                 {
  104.                 hexstring[i] = 'B';
  105.                 i++;
  106.                 }
  107.                 else if (r[index] == 12)
  108.                 {
  109.                 hexstring[i] = 'C';
  110.                 i++;
  111.                 }
  112.                 else if (r[index] == 13)
  113.                 {
  114.                 hexstring[i] = 'D';
  115.                 i++;
  116.                 }
  117.                 else if (r[index] == 14)
  118.                 {
  119.                 hexstring[i] = 'E';
  120.                 i++;
  121.                 }
  122.                 else if (r[index] == 15)
  123.                 {
  124.                 hexstring[i] = 'F';
  125.                 i++;
  126.                 }
  127.                 else
  128.                 {
  129.                 printf("Err %d\n", r[index]);
  130.                 }
  131.         }
  132.         return;
  133. }
  134.  
  135. /* function converts hexstring array to equivalent integer value  */
  136. int xtoi(char hexstring[])
  137. {
  138.         printf("in xtoi, processing %s\n", hexstring);
  139.         int answer = 0;
  140.         int i = 0;
  141.         int valid = 1;
  142.         int hexit;
  143.  
  144.         if (hexstring[i] == '0')
  145.         {
  146.                 ++i;
  147.                 if (hexstring[i] == 'x' || hexstring[i] == 'X')
  148.                 {
  149.                         ++i;
  150.                 }
  151.         }
  152.         while(valid && hexstring[i] != '\0')
  153.         {
  154.                 answer = answer * 16;
  155.                 if(hexstring[i] >='0' && hexstring[i] <= '9')
  156.                 {
  157.                         answer = answer + (hexstring[i] - '0');
  158.                 }
  159.                 else
  160.                 {
  161.                         hexit = hex_Val(hexstring[i]);
  162.                         if (hexit == 0)
  163.                         {
  164.                                 valid = 0;
  165.                         }
  166.                         else
  167.                         {
  168.                         answer = answer + hexit;
  169.                         }
  170.                 }
  171.                 ++i;
  172.         }
  173.         if(!valid)
  174.         {
  175.                 answer = 0;
  176.         }
  177.  
  178.         return answer;
  179. }

Desired Output:


Where I have marked red I was wondering why I get that funny 'I'. If someone could solve this it would be greatly appreciated! Thanks guys for all your help

better you supply the code how you are passing the the arguments to functions or the main program
Minds are like parachutes - they only work when they are open
Gaiety
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