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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. int main(void) {
  5. 	int tests[] = { 1, 5, 10, 25, 100, 125, 250, 625, 1000 };
  6. 	int num_tests = sizeof(tests) / sizeof(tests[0]);
  7. 	int i;
  8.  
  9. 	for (i = 0; i < num_tests; ++i)
  10. 	{
  11. 		int x = tests[i];
  12. 		int n = (int)(log(x) / log(5)); // get n = log5(x), truncated to integer
  13.         if (pow(5, n) == x)         // test to see whether x == 5^n
  14.             printf("%d is a power of 5\n", x);
  15.         else
  16.             printf("%d is not a power of 5\n", x);
  17. 	}
  18. 	return 0;
  19. }
  20.  
Success #stdin #stdout 0s 2248KB
comments (?)
stdin 
Standard input is empty
stdout 
1 is a power of 5
5 is a power of 5
10 is not a power of 5
25 is a power of 5
100 is not a power of 5
125 is a power of 5
250 is not a power of 5
625 is a power of 5
1000 is not a power of 5
https://ideone.com/6MYwO9
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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