#include <stdio.h>

// For the CUDA runtime routines (prefixed with "cuda_")
#include <cuda_runtime.h>
#include <curand.h>
#include <curand_kernel.h>

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

int main(void)
{
	int a, b, c; // host copies of a, b, c
	int *d_a, *d_b, *d_c; // device copies of a, b, c
	int size = sizeof(int);
	
	// Allocate space for device copies of a, b, c
	cudaMalloc((void **)&d_a, size);
	cudaMalloc((void **)&d_b, size);
	cudaMalloc((void **)&d_c, size);
	
	// Setup input values
	a = 2;
	b = 7;
	
	// Copy inputs to device
	cudaMemcpy(d_a, &a, size, cudaMemcpyHostToDevice);
	cudaMemcpy(d_b, &b, size, cudaMemcpyHostToDevice);
	// Launch add() kernel on GPU
	add<<<1,1>>>(d_a, d_b, d_c);
	// Copy result back to host
	cudaMemcpy(&c, d_c, size, cudaMemcpyDeviceToHost);
	// Cleanup
	cudaFree(d_a); cudaFree(d_b); cudaFree(d_c);

	printf("c =  %d\n", c);
	
    return 0;
}