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  1. #include <stdio.h>
  2. int mod(int n){
  3. 	int a;
  4. 	if(n<=0){
  5. 		return 0;
  6. 	}else{
  7. 	a=n*n;
  8. 	if(a%10==n){
  9. 	return n+mod(n-1);
  10. 	}else{
  11. 		return mod(n-1);
  12. 	}
  13. 	}
  14. }
  15. int main(void) {
  16. 	printf("%d",mod(10));
  17. 	return 0;
  18. }
  19.  
Success #stdin #stdout 0s 5316KB
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stdin 
Standard input is empty
stdout 
12
https://ideone.com/mG9z1W
language:
C (gcc 8.3)
created:
7 days ago
visibility:
public

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