#include <mpi.h>
#include <stdio.h>

int main(int argc, char *argv[]) {
    int rank, size;
    MPI_Init(&argc, &argv);          // Initialize MPI environment
    MPI_Comm_rank(MPI_COMM_WORLD, &rank); // Get the rank of the process
    MPI_Comm_size(MPI_COMM_WORLD, &size); // Get the number of processes

    if (rank == 0) {
        // Process 0 sends a message to process 1
        int msg = 100;
        printf("Process %d sending message: %d\n", rank, msg);
        MPI_Send(&msg, 1, MPI_INT, 1, 0, MPI_COMM_WORLD);
    } else if (rank == 1) {
        // Process 1 receives the message from process 0
        int msg;
        MPI_Recv(&msg, 1, MPI_INT, 0, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
        printf("Process %d received message: %d\n", rank, msg);
    }

    MPI_Finalize(); // Finalize MPI environment
    return 0;
}