块错误的openmp [英] openmp for block error

问题描述

为什么 openmp 给我这个错误:-

Why does openmp give me this error :-

error: for statement expected before ‘{’ token

error: for statement expected before ‘{’ token

#include <stdio.h>
#include <stdlib.h>
#include <omp.h>
#include <unistd.h>

int main (int argc, char *argv[]) 
{

#pragma omp parallel 
{

int a[100],b[100],c[100];
int i =0;

    for(; i < 100; i++){
    a[i] = i;
    b[i] = i;
    }

    #pragma omp parallel for schedule(static,5)
    {
    int i = 0;
        for( ; i < 100 ; i++){ // this is the for loop that is referred in the error message
    c[i] = a[i] + b[i];
    }

    }

}

printf("Outside parallel block \n");

}

推荐答案

首先，第二个 OpenMP pragma 不应该有parallel"；您已经打开了一个并行块，您现在需要共享 for 循环的工作.

First, the second OpenMP pragma shouldn't have a "parallel" in it; you've already opened a parallel block, you just now need to share the work of the for loop.

其次，你不能用平行来包围一个通用块；它必须是一个 for 循环.如果您真的想要一个不同于上面使用的 i，请执行以下操作:

Second, you can't have the parallel for enclose a general block; it has to be a for loop. If you really want a different i than is used above, do:

#pragma omp for schedule(static,5)
for (int i=0; i < 100; i++)
{
    c[i] = a[i] + b[i];
}

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