fork download 
  1. #include <stdio.h>
  2. #include <omp.h>
  3.  
  4. #define N 1000000
  5.  
  6. int dotProduct(int *a, int *b, int n) {
  7.     int dot = 0;
  8.     #pragma omp parallel for reduction(+:dot)
  9.     for (int i = 0; i < n; i++) {
  10.         dot += a[i] * b[i];
  11.     }
  12.     return dot;
  13. }
  14.  
  15. int main() {
  16.     int a[N], b[N];
  17.  
  18.     // Initialize arrays a and b
  19.     for (int i = 0; i < N; i++) {
  20.         a[i] = i;
  21.         b[i] = 2 * i;
  22.     }
  23.  
  24.     // Compute dot product
  25.     int result = dotProduct(a, b, N);
  26.  
  27.     // Display the result
  28.     printf("Dot product: %d\n", result);
  29.  
  30.     return 0;
  31. }
  32.  
Success #stdin #stdout 0.01s 9300KB
comments (?)
stdin 
Standard input is empty
stdout 
Dot product: 1168289984
https://ideone.com/c55Ufb
language:
C (gcc 8.3)
created:
12 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!