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  1. #include <stdio.h>
  2. #include <stdbool.h>
  3.  
  4. bool divisible15(unsigned int x)
  5. {
  6.     //286331153 = (2^32 - 1) / 15
  7.     //4008636143 = (2^32) - 286331153
  8.     return x * 4008636143 <= 286331153;
  9. }
  10.  
  11. int main(void) {
  12. 	printf("%d\n", divisible15(15));
  13. 	return 0;
  14. }
Success #stdin #stdout 0s 2248KB
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https://ideone.com/HKqjiw
language:
C99 (gcc 8.3)
created:
11 years ago
visibility:
public

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