#include "stdio.h"

__global__ void add(int a, int b, int *c) {
    *c = a + b;
}

int main() {

    int a,b,c;
    int* dev_c;

    a=3;
    b=4;

    cudaMalloc((void**)&dev_c, sizeof(int));

    add<<<1,1>>>(a,b,dev_c);

    cudaMemcpy(&c, dev_c, sizeof(int), cudaMemcpyDeviceToHost);

    printf("%d + %d is %d\n", a, b, c);

    cudaFree(dev_c);

    return 0;
}