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  1. #include <stdio.h>
  2. int prime_factor(int n, int factor){
  3. 	if(n<=2){
  4. 	return 0;
  5. 	}
  6. 	if(n%factor==0){
  7. 		if(n/factor!=1) printf("%dx",factor);
  8. 		else printf("%d",factor);
  9. 		prime_factor(n/factor,factor);
  10. 	}
  11. 	else{
  12. 		prime_factor(n,factor+1);
  13. 	}
  14. }
  15. int main() {
  16. 	int num;
  17. 	printf("3以上の整数を入力してください:");
  18. 	scanf("%d",&num);
  19. 	printf("\n%d=",num);
  20. 	prime_factor(num,2);
  21. 	return 0;
  22. }
  23.  
Success #stdin #stdout 0.01s 5320KB
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1974
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3以上の整数を入力してください:
1974=2x3x7x47
https://ideone.com/m10znz
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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