#include <stdio.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);

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

		// Cleanup
		cudaFree(d_a); cudaFree(d_b); cudaFree(d_c);
		return 0;
	}