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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <limits.h>
  4.  
  5. unsigned int multiply (unsigned short a, unsigned short b)
  6. {
  7.   register unsigned int result = 0;
  8.   char n;
  9.  
  10.   for (n = 0; b & (1 << n); n++)
  11.   {
  12.     if ( b & (1 << n) )
  13.       result += a << n;
  14.   }
  15.   return result;
  16. }
  17.  
  18. int main(void)
  19. {
  20.  
  21.   unsigned short a, b;
  22.   a = 0;
  23.   b = 0;
  24.  
  25.   {
  26.     if (multiply(a, b) != a * b)
  27.     {
  28.       fprintf(stderr,
  29.                "ERROR:\n"
  30.                "my: %u\n"
  31.                "norm: %u\n"
  32.                "\n",
  33.                multiply(a, b), a * b
  34.              );
  35.     }
  36.     if (USHRT_MAX == a)
  37.     {
  38.       b++;
  39.     }
  40.     a++;
  41.  
  42.   } while ( (a != 0) && (b != 0) );
  43.  
  44.   printf("Done!");
  45.  
  46.   return 0;
  47. }
  48.  
Success #stdin #stdout 0s 1788KB
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Done!
https://ideone.com/pqGb8R
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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