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#include "cuda_runtime.h"
#include "device_launch_parameters.h"
#include <stdio.h>
#define N 10
__global__ void add(int *a, int *b, int *c)
{
int tid = blockIdx.x;
c[tid] = a[tid] + b[tid];
}
int main()
{
int a[N], b[N], c[N];
int *deva, *devb, *devc;
//在GPU上分配内存
cudaMalloc((void **)&deva, N * sizeof(int));
cudaMalloc((void **)&devb, N * sizeof(int));
cudaMalloc((void **)&devc, N * sizeof(int));
//在CPU上为数组赋值
for (int i = 0; i < N; i++)
{
a[i] = -i;
b[i] = i*i;
}
//将数组a和b传到GPU
cudaMemcpy(deva, a, N * sizeof(int), cudaMemcpyHostToDevice);
cudaMemcpy(devb, b, N * sizeof(int), cudaMemcpyHostToDevice);
cudaMemcpy(devc, c, N * sizeof(int), cudaMemcpyHostToDevice);
add << <N, 1 >> >(deva, devb, devc);
//将数组c从GPU传到CPU
cudaMemcpy(c, devc, N * sizeof(int), cudaMemcpyDeviceToHost);
for (int i = 0; i < N; i++)
{
printf("%d+%d=%d\n", a[i], b[i], c[i]);
}
cudaFree(deva);
cudaFree(devb);
cudaFree(devc);
return 0;
}