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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <limits.h>
  4. #include <inttypes.h>
  5.  
  6. uint32_t multiply (uint16_t a, uint16_t b)
  7. {
  8.   //uint16_t mask = 0b0000000000000001;
  9.  
  10.   register uint32_t result = 0;
  11.   char n = 0;
  12.   /*
  13.   for (n = 0; b >= (1 << n); n++)
  14.   {
  15.     if ( b & (1 << n) )
  16.       result += a << n;
  17.   }*/
  18.   if ( b & (1 << n) )
  19.     result += a << n;  
  20.   n++;
  21.   if ( b & (1 << n) )
  22.     result += a << n;  
  23.   n++;
  24.   if ( b & (1 << n) )
  25.     result += a << n;  
  26.   n++;
  27.   if ( b & (1 << n) )
  28.     result += a << n;  
  29.   n++;
  30.   if ( b & (1 << n) )
  31.     result += a << n;  
  32.   n++;
  33.   if ( b & (1 << n) )
  34.     result += a << n;  
  35.   n++;
  36.   if ( b & (1 << n) )
  37.     result += a << n;  
  38.   n++;
  39.   if ( b & (1 << n) )
  40.     result += a << n;  
  41.   n++;
  42.   if ( b & (1 << n) )
  43.     result += a << n;  
  44.   n++;
  45.   if ( b & (1 << n) )
  46.     result += a << n;  
  47.   n++;
  48.   if ( b & (1 << n) )
  49.     result += a << n;  
  50.   n++;
  51.   if ( b & (1 << n) )
  52.     result += a << n;  
  53.   n++;
  54.   if ( b & (1 << n) )
  55.     result += a << n;  
  56.   n++;
  57.   if ( b & (1 << n) )
  58.     result += a << n;  
  59.   n++;
  60.   if ( b & (1 << n) )
  61.     result += a << n;  
  62.   n++;
  63.   if ( b & (1 << n) )
  64.     result += a << n;  
  65.   return result;
  66. }
  67.  
  68. int main(void)
  69. {
  70.  
  71.   uint16_t a, b;
  72.   a = 0;
  73.   b = 0;
  74.  
  75.   do
  76.   {
  77.     if (multiply(a, b) != a * b)
  78.  
  79.  
  80.       fprintf(stderr,
  81.                "ERROR:\n"
  82.                "my: %u\n"
  83.                "norm: %u\n"
  84.                "%hu * %hu\n"
  85.                "\n",
  86.                multiply(a, b), (a * b),a, b
  87.              );
  88.  
  89.     if (UINT16_MAX == a)
  90.     {
  91.       b++;
  92.     }
  93.     a++;
  94.   //fprintf(stderr, "%hu * %hu\n", a, b);
  95.   } while ( ( a != 0 ) || (b != 0) );
  96.  
  97.   fprintf(stderr, "%"PRIu16"* ""%"PRIu16"\n", a, b);
  98.   printf("Done!\n");
  99.  
  100.   return 0;
  101. }
  102.  
Time limit exceeded #stdin #stdout 5s 1828KB
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https://ideone.com/9kH1J6
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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