MPI_C_DOUBLE_COMPLEX

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

/**
 * @brief Illustrate how to communicate a complex double precision float between
 * 2 MPI processes.
 * @details This application is meant to be run with 2 MPI processes: 1 sender
 * and 1 receiver. The former sends a complex double precision float to the
 * latter, which prints it.
 **/
int main(int argc, char* argv[])
{
    MPI_Init(&argc, &argv);

    // Check that 2 MPI processes are used.
    int size;
    MPI_Comm_size(MPI_COMM_WORLD, &size);
    if(size != 2)
    {
        printf("This application is meant to be run with 2 MPI processes.\n");
        MPI_Abort(MPI_COMM_WORLD, EXIT_FAILURE);
    }

    // Get my rank and do the corresponding job.
    enum role_ranks { SENDER, RECEIVER };
    int my_rank;
    MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
    switch(my_rank)
    {
        case SENDER:
        {
            // Send the double complex
            double _Complex complexToSend = I * I;
            printf("[MPI process %d] I send double complex: %.1f+%.1fi.\n", my_rank, creal(complexToSend), cimag(complexToSend));
            MPI_Ssend(&complexToSend, 1, MPI_C_DOUBLE_COMPLEX, RECEIVER, 0, MPI_COMM_WORLD);
            break;
        }
        case RECEIVER:
        {
            // Receive the double complex
            double _Complex complexReceived;
            MPI_Recv(&complexReceived, 1, MPI_C_DOUBLE_COMPLEX, SENDER, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
            printf("[MPI process %d] I received double complex: %.1f+%.1fi.\n", my_rank, creal(complexReceived), cimag(complexReceived));
            break;
        }
    }

    MPI_Finalize();

    return EXIT_SUCCESS;
}

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

/**
 * @brief Illustrate how to communicate an array of double precision floats
 * between 2 MPI processes.
 * @details This application is meant to be run with 2 MPI processes: 1 sender
 * and 1 receiver. The former sends an array of double precision floats to the
 * latter, which prints it.
 **/
int main(int argc, char* argv[])
{
    MPI_Init(&argc, &argv);

    // Check that 2 MPI processes are used.
    int size;
    MPI_Comm_size(MPI_COMM_WORLD, &size);
    if(size != 2)
    {
        printf("This application is meant to be run with 2 MPI processes.\n");
        MPI_Abort(MPI_COMM_WORLD, EXIT_FAILURE);
    }

    // Get my rank and do the corresponding job.
    enum role_ranks { SENDER, RECEIVER };
    int my_rank;
    MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
    switch(my_rank)
    {
        case SENDER:
        {
            // Send the double complexes
            double _Complex complexesToSend[2] = { I * I, 2 * I * I };
            printf("[MPI process %d] I send double complexes: %.1f+%.1fi and %.1f+%.1fi.\n", my_rank, creal(complexesToSend[0]), cimag(complexesToSend[0]), creal(complexesToSend[1]), cimag(complexesToSend[1]));
            MPI_Ssend(complexesToSend, 2, MPI_C_DOUBLE_COMPLEX, RECEIVER, 0, MPI_COMM_WORLD);
            break;
        }
        case RECEIVER:
        {
            // Receive the double complexes
            double _Complex complexesReceived[2];
            MPI_Recv(complexesReceived, 2, MPI_C_DOUBLE_COMPLEX, SENDER, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
            printf("[MPI process %d] I received double complexes: %.1f+%.1fi and %.1f+%.1fi.\n", my_rank, creal(complexesReceived[0]), cimag(complexesReceived[0]), creal(complexesReceived[1]), cimag(complexesReceived[1]));
            break;
        }
    }

    MPI_Finalize();

    return EXIT_SUCCESS;
}