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  1. #include <stdio.h>
  2.  
  3. float sum(float *p, int n) {
  4.     if (n == 1) return *p;
  5.     for (int i = 0; i < n/2; i++) {
  6.         p[i] += p[i+n/2];
  7.     }
  8.     return sum(p, n/2);
  9. }
  10.  
  11. int main(void) {
  12.     float x[1024*1024];
  13.     for (int i = 0; i < 1024*1024; i++) {
  14.         x[i] = 30504.00005f;
  15.     }
  16.  
  17.     float acc = sum(x, 1024*1024);
  18.  
  19.     acc /= (1024*1024);
  20.     printf("%f\n", acc);
  21.     return 0;
  22. }
Success #stdin #stdout 0.01s 5800KB
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stdin
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Standard input is empty
stdout
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30504.000000
https://ideone.com/QDUD9D
language:
C99 (gcc 8.3)
created:
10 years ago
visibility:
public

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