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  1. #include <stdio.h>
  2.   int sum( int n){   
  3.          if (n==0|| n==1) return n;
  4.          else return n+sum(n-1);
  5.    }
  6.  
  7. int main(void) {
  8. 	int n;
  9.     printf("Enter the value of n: \n");
  10.     scanf("%d",&n);
  11.     int x = sum(n);
  12.     printf("%d",x);
  13. 	return 0;
  14. }
Success #stdin #stdout 0s 5320KB
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stdin
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5
stdout
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Enter the value of n: 
15
https://ideone.com/2YReCC
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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