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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,count;
  7. 	scanf("%d",&num);
  8. 	for(int i=1;i<=num;i++){
  9. 		for(int j=1;j<=i;j++){
  10. 			if(i%j==0&&num%j==0){
  11. 				count++;
  12. 			}
  13. 		}
  14. 	}
  15. 	printf("φ(%d)=%d",num,count);
  16. 	return 0;
  17. }
Success #stdin #stdout 0s 5320KB
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stdin
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2
stdout
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φ(2)=3
https://ideone.com/TfZHxJ
language:
C (gcc 8.3)
created:
1 hour ago
visibility:
public

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