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  1. #include <stdio.h>
  2. void rec(int *p, int n) {
  3.     if (n == 0) return;
  4.     *p += n;
  5.     rec(p, n - 1);
  6. }
  7. int main(void) {
  8.     int sum = 0;
  9.     rec(&sum, 100);
  10.     printf("sum is %d\n", sum);
  11. }
  12.  
Success #stdin #stdout 0s 4492KB
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stdin
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Standard input is empty
stdout
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sum is 5050
https://ideone.com/dJWxaP
recurse with pointer
language:
C (gcc 8.3)
created:
6 years ago
visibility:
secret

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