#include <stdio.h>

__global__ void cuda_hello(int* number, int* out) {
    *out = *number;
    for(int i = 0; i < 255; i++) {
        *out += 1;
    }
}

int main() {
    int *number, *out;
    int *d_number, *d_out;
    number = (int*)malloc(sizeof(int));
    out = (int*)malloc(sizeof(int));

    *number = 22;
    *out = 0;

    cudaMalloc((void**)&d_number, sizeof(int));
    cudaMemcpy(d_number, number, sizeof(int), cudaMemcpyHostToDevice);
    cudaMalloc((void**)&d_out, sizeof(int));
    cudaMemcpy(d_out, out, sizeof(int), cudaMemcpyHostToDevice);


    cuda_hello<<<1,1>>>(d_number, d_out);

    cudaDeviceSynchronize();

    cudaMemcpy(out, d_out, sizeof(int), cudaMemcpyDeviceToHost);

    cudaFree(d_number);
    cudaFree(d_out);


    printf("Number: %i\n", *out);

    free(number);
    free(out);

    return 0;
}