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  1. #include <stdio.h>
  2. int sigma(int n){
  3.     if (n == 1){
  4.         return 1;
  5.     }
  6.     else{
  7.         return 2*n + sigma(n-1);
  8.     }
  9. }
  10.  
  11. int main(void) {
  12.     int n = 3;
  13.     printf("a_%d=%d\n", n, sigma(n));
  14. 	return 0;
  15. }
  16.  
Success #stdin #stdout 0s 5288KB
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stdin
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Standard input is empty
stdout
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a_3=11
https://ideone.com/l93WA0
language:
C (gcc 8.3)
created:
5 days ago
visibility:
public

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