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  1. #include <stdio.h>
  2.  
  3. int
  4. main()
  5. {
  6.   char            s1[] = "10110001";
  7.   char            s2[] = "00101110";
  8.   char           *p1, *p2;
  9.   int             carry;
  10.  
  11.   printf("  %s\n- %s\n----------\n", s1, s2);
  12.  
  13.   p2 = s2;
  14.   while (*p2) {
  15.     if (*p2 == '0')
  16.       *p2 = '1';
  17.     else
  18.       *p2 = '0';
  19.     /* *p2 = (*p2 == '0' ? '1' : '0'); */
  20.     p2++;
  21.   }
  22.  
  23.   for (p1 = s1; *p1; p1++);
  24.   for (p2 = s2; *p2; p2++);
  25.  
  26.   carry = 1;
  27.   while (s1 < p1) {
  28.     p1--;
  29.     p2--;
  30.     carry += (*p1 - '0') + (*p2 - '0');
  31.     *p2 = '0' + (carry % 2);
  32.     carry /= 2;
  33.   }
  34.  
  35.   printf("= %s\n", s2);
  36.  
  37.   return 0;
  38. }
Success #stdin #stdout 0.02s 1720KB
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stdin
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Standard input is empty
stdout
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  10110001
- 00101110
----------
= 10000011
https://ideone.com/EQvG1
language:
C (gcc 8.3)
created:
12 years ago
visibility:
secret

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