(cache)[Wandbox]三へ( へ՞ਊ ՞)へﾊｯﾊｯ

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Load template

Warnings

Optimization

Verbose

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-fopenmp

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About sponsors(Japanese)

created by

anonymous

1 minute ago

​x
    elapsed = (double) (tv2.tv_sec-tv1.tv_sec) + (double) (tv2.tv_usec-tv1.tv_usec) * 1.e-6;
 
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <omp.h>
#include <sys/time.h>
​
​
#define N 10000
​
int A[N][N];
int B[N][N];
int C[N][N];
​
int main(){
​
    int i,j,k;
    struct timeval tv1, tv2;
    struct timezone tz;
    double elapsed;
    for (i= 0; i< N; i++){
        for (j= 0; j< N; j++)
        {
            A[i][j] = 3;
            B[i][j] = 3;
        }
    }
    gettimeofday(&tv1, &tz);
    omp_set_num_threads(4);

Editor settings:

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$ gcc prog.c -Wall -Wextra -std=gnu11 "-fopenmp"

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#permlink

Code

Start

prog.c: In function 'main':
prog.c:29:35: error: expected 'none' or 'shared' before 'private'
   29 |     #pragma omp parallel default (private) shared (A,B,C,N) num_threads(4)
      |                                   ^~~~~~~
prog.c:29:58: error: expected ')' before numeric constant
   29 |     #pragma omp parallel default (private) shared (A,B,C,N) num_threads(4)
      |                                                   ~      ^
      |                                                          )

Finish

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