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  1. #include <stdio.h>
  2. #include <stdint.h>
  3.  
  4. uint16_t mul(uint16_t a, uint16_t b) {
  5.   uint16_t res = 0;
  6.  
  7.   if (!a || !b) {
  8.     return 0;
  9.   }
  10.  
  11.   int i = 0;
  12.   while (i < 16) {
  13.     if (a & (1 << i)) {
  14.       res += b;
  15.     }
  16.     b <<= 1;
  17.     i++;
  18.   }
  19.   return res;
  20. }
  21.  
  22. void example_mul(uint16_t a, uint16_t b) {
  23.   printf("%d*%d = %d\n", a, b, mul(a, b));
  24. }
  25.  
  26. int main() {
  27.   example_mul(5, 6);
  28.   example_mul(7, 4);
  29.   example_mul(3, 21);
  30.   return 0;
  31. }
  32.  
Success #stdin #stdout 0s 4188KB
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stdin
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Standard input is empty
stdout
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5*6 = 30
7*4 = 28
3*21 = 63
https://ideone.com/5JwO34
language:
C (gcc 8.3)
created:
5 years ago
visibility:
public

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