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  1. #include<stdio.h>
  2.  
  3. int rev_fact(int n)
  4. {
  5. 	if(n<1)
  6. 		return -1;
  7. 	if(n==0)
  8. 		return 1;
  9. 	int f=1, i=1;
  10. 	while(f<n){
  11. 		i++;
  12. 		f*=i;	
  13. 	}
  14. 	if(f==n)
  15. 		return i;
  16. 	return -1;
  17.  
  18. }
  19. int main(int argc, char const *argv[])
  20. {
  21. 	int x;
  22. 	printf("Please give x");
  23. 	scanf("%d",&x);
  24. 	if(rev_fact(x)==-1)
  25. 		printf("No factorial is equal to %d",x);
  26. 	else
  27. 		printf("%d!=%d",rev_fact(x),x);
  28. 	return 0;
  29. }
  30.  
Success #stdin #stdout 0s 5328KB
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Standard input is empty
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Please give xNo factorial is equal to 0
https://ideone.com/xP4jXr
language:
C (clang 8.0)
created:
8 days ago
visibility:
public

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