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Rot 13 Help

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Rot 13 Help

 
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  #1
21 Days Ago
I made a program that finds the ROT 13, but theres a little thing thats messing it up for me. Its supposed to find the ROT 13 of each character but when i run it, it gives me some funky character in return
C Syntax (Toggle Plain Text) 
  1. #include <stdio.h>
  2. #include <string.h>
  3.  
  4. int rot13(int c)
  5. {
  6.   if (c >= 'A' && c < 'N')
  7.     {
  8.       return c + 13;
  9.     }
  10.   if (c >= 'N' && c <= 'Z')
  11.     {
  12.       return c - 13;
  13.     }
  14.   if (c >= 'a' && c < 'n')
  15.     {
  16.       return c + 13;
  17.     }
  18.   if (c >= 'n' && c <= 'z')
  19.     {
  20.       return c - 13;
  21.     }
  22.  
  23. }
  24. int main(void)
  25. {
  26.   int c; 
  27.   printf("Enter a character: ");
  28.  
  29.   while((c == getchar())!= EOF)
  30.     { 
  31.       char a = rot13(c);
  32.       printf("%c", a);   
  33.       c++;
  34.     }
  35.   return 0;
  36. }
Can some one help me out please
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Dave Sinkula Dave Sinkula is offline Offline
long time no c
 
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  #2
21 Days Ago 
while((c = getchar())!= EOF)
And what does your function return for non-alpha input?
"One of the methods used by statists to destroy capitalism consists in establishing controls that tie a given industry hand and foot, making it unable to solve its problems, then declaring that freedom has failed and stronger controls are necessary." --Ayn Rand
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  #3
21 Days Ago
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Originally Posted by Dave Sinkula View Post 
while((c = getchar())!= EOF)
And what does your function return for non-alpha input?
It just returns the number
if I input 10, it returns 10
if I input ? it returns ?

This program is supposed to do only one of the characters
If i input Apple, its supposed to return N and nothing else
Last edited by yasaswyg; 21 Days Ago at 7:46 pm.
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Dave Sinkula Dave Sinkula is offline Offline
long time no c
 
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  #4
21 Days Ago
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Originally Posted by yasaswyg View Post
It just returns the number
if I input 10, it returns 10
if I input ? it returns ?
I don't see that return c; line.
"One of the methods used by statists to destroy capitalism consists in establishing controls that tie a given industry hand and foot, making it unable to solve its problems, then declaring that freedom has failed and stronger controls are necessary." --Ayn Rand
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  #5
21 Days Ago
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Originally Posted by Dave Sinkula View Post
I don't see that return c; line.
I put that in.

my new code looks like this
C Syntax (Toggle Plain Text) 
  1. #include <stdio.h>
  2. #include <string.h>
  3.  
  4.  
  5. int rot13(int c)
  6. {
  7.   if (c >= 'A' && c < 'N')
  8.     {
  9.       return c + 13;
  10.     }
  11.   if (c >= 'N' && c <= 'Z')
  12.     {
  13.       return c - 13;
  14.     }
  15.   if (c >= 'a' && c < 'n')
  16.     {
  17.       return c + 13;
  18.     }
  19.   if (c >= 'n' && c <= 'z')
  20.     {
  21.       return c - 13;
  22.     }
  23. 	return c;
  24. }
  25. int main(void)
  26. {
  27.   int c; 
  28.   printf("ROT 13 Converter\n\nEnter a Character: ");
  29.  
  30. 	while((c = getchar())!= EOF) 
  31. 	{ 
  32.       char a = rot13(c);
  33.       printf("%c", a);   
  34.       c++;
  35.     }
  36.   return 0;
  37. }
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