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  1. #include <stdio.h>
  2. #include <stdbool.h>
  3.  
  4. bool isPowerOfThree(int n) {
  5.     return n > 0 && 1162261467 % n == 0;    //利用int範圍內最大的power of three判斷
  6. }
  7.  
  8. int main(){
  9.     int n;
  10.     scanf("%d",&n);
  11.     bool result=isPowerOfThree(n);
  12.     (result==0)? printf("false"):printf("true");
  13.     return 0;
  14. }
Success #stdin #stdout 0s 5316KB
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stdin
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Standard input is empty
stdout
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false
https://ideone.com/iWLqlb
判斷power of three（不用迴圈，用最大的整數）
language:
C (gcc 8.3)
created:
9 hours ago
visibility:
public

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