#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;
}