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  1. //入力した数字のオイラーのφ関数を出力
  2.  
  3. #include <stdio.h>
  4.  
  5. int main(void){
  6. 	int num,euler;
  7. 	scanf("%d",&num);
  8. 	euler=num;
  9. 	for(int i=2;i>(num/2);i++){
  10. 		if(num%i==0){
  11. 			euler=euler*(1-1/i);
  12. 		}
  13. 	}
  14. 	printf("φ(%d)=%d",num,euler);
  15.  
  16. 	return 0;
  17. }
Success #stdin #stdout 0s 5316KB
comments (?)
stdin
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30
stdout
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φ(30)=30
https://ideone.com/k0fnBE
language:
C (gcc 8.3)
created:
59 minutes ago
visibility:
public

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