print the number 7011 as 011 (take off a 7)

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print the number 7011 as 011 (take off a 7)

 
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  #1
Feb 5th, 2008
I need to print out a number that begins with 7, without the seven. For example, print 71011 as 1011 or 701 as 01. I've tried many techniques and just can't get it to work. Is there a printf format that will let me print out everything left of the decimal minus that very left number? I've also tried to make a string that will contain the 0's and 1's, but not the 7... it is not working however.

Any help would be greatly appreciated. Thanks
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Re: print the number 7011 as 011 (take off a 7)

 
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Feb 5th, 2008
Use sprintf to convert the number to a string and then print all but the first character:
c Syntax (Toggle Plain Text) 
  1. sprintf ( buffer, "%d", value );
  2. puts ( &buffer[1] );
Last edited by Narue; Feb 5th, 2008 at 5:24 pm.
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Re: print the number 7011 as 011 (take off a 7)

 
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  #3
Feb 5th, 2008
try the modulus operator %

ie

int x = (71011 % 70000);

and x = 1011
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Re: print the number 7011 as 011 (take off a 7)

 
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  #4
Feb 5th, 2008
Thanks for the help guys, I finally got it working with the sprintf tip. The modulus wont work if my number starts with 0 however, learned that the hard way already, but thanks for the help!
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Re: print the number 7011 as 011 (take off a 7)

 
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Feb 6th, 2008
>The modulus wont work if my number starts with 0
Your number won't start with 0 if you store it in an integer type. Leading zeros are ignored on formatted integer input and during integer processing. The only way to get the leading zero is to convert the number to a formatted string that specifies a field width and zero fill:
c Syntax (Toggle Plain Text) 
  1. sprintf ( buffer, "%0*d", digits + 1, value );
The real problem with the remainder operator is that you're extracting the most significant digit, which involves finding the width of the number to create an appropriate mask if the value can have a variable number of digits:
c Syntax (Toggle Plain Text) 
  1. #include <stdio.h>
  2.  
  3. int get_mask ( int value )
  4. {
  5.   int mask = 1;
  6.  
  7.   do {
  8.     mask *= 10;
  9.     value /= 10;
  10.   } while ( value > 9 );
  11.  
  12.   return mask;
  13. }
  14.  
  15. int main ( void )
  16. {
  17.   int value = 123;
  18.  
  19.   value %= get_mask ( value );
  20.   printf ( "%d\n", value );
  21.  
  22.   return 0;
  23. }
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Re: print the number 7011 as 011 (take off a 7)

 
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Feb 6th, 2008
Alternative way from Narue:

C Syntax (Toggle Plain Text) 
  1. // input your num here.
  2. for (temp = num; temp > 9; temp /= 10)
  3.   printf("%c", '0' + (temp % 10));
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Re: print the number 7011 as 011 (take off a 7)

 
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Feb 6th, 2008
>Alternative way from Narue:
Maybe I missed something, but I don't think the original question included reversing the digits as well as trimming the most significant digit.
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Re: print the number 7011 as 011 (take off a 7)

 
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Feb 6th, 2008
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Originally Posted by Narue View Post
>Alternative way from Narue:
Maybe I missed something, but I don't think the original question included reversing the digits as well as trimming the most significant digit.
Sorry. Without much thinking, I jumped to answer this question.
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