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  1. #include <stdio.h>
  2. #include <stdbool.h>
  3.  
  4. bool isPowerOfThree(int n) {
  5.     if(n<=0) return 0;
  6.     while(n%3==0)
  7.         n/=3;
  8.     if(n==1) return 1;
  9.     else return 0;
  10. }
  11. int main(){
  12.     int n;
  13.     scanf("%d",&n);
  14.     bool result=isPowerOfThree(n);
  15.     (result==0)? printf("false"):printf("true");
  16.     return 0;
  17. }
Success #stdin #stdout 0.01s 5292KB
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stdin
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6
stdout
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false
https://ideone.com/LQRDMm
判斷power of three（利用迴圈）
language:
C (gcc 8.3)
created:
21 hours ago
visibility:
public

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