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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;
  7. 	double euler;
  8. 	scanf("%d",&num);
  9. 	euler=num;
  10. 	for(int i=2;i<num/2;i++){
  11. 		if(num%i==0){
  12. 			euler=euler*(1-1/i);
  13. 		}
  14. 	}
  15. 	printf("φ(%d)=%d",num,euler);
  16.  
  17. 	return 0;
  18. }
Success #stdin #stdout 0s 5308KB
comments (?)
stdin
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30
stdout
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φ(30)=0
https://ideone.com/IiUzNc
language:
C (gcc 8.3)
created:
53 minutes ago
visibility:
public

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