A simple Sum

[xgiovio]

#include <iostream>

__global__ void sum (int * a, int *b, int* c){

    *c = (*a + *b);
}


int main( void ) {

    int a,b,c;
    a=10;
    b=20;

    int * d_a_pointer;
    int * d_b_pointer;
    int * d_c_pointer;

    cudaMalloc ((void **)&d_a_pointer, sizeof(int));
    cudaMalloc ((void **)&d_b_pointer, sizeof(int));
    cudaMalloc ((void **)&d_c_pointer, sizeof(int));


    cudaMemcpy( d_a_pointer, &a, sizeof(int), cudaMemcpyHostToDevice);
    cudaMemcpy( d_b_pointer, &b, sizeof(int), cudaMemcpyHostToDevice);

    sum<<<1,1>>>(d_a_pointer, d_b_pointer, d_c_pointer);
    cudaMemcpy( &c, d_c_pointer , sizeof(int), cudaMemcpyDeviceToHost);


    std::cout << c;

    std::cin.get();


return 0;
}