send third row of a matrix from process 0 to process 1

/* send_row.c -- send third row of a matrix from process 0 to process 1
*
* Input: none
* Output: the row received by process 1
*
* Note: Program should only be run with 2 processes
*
* See Chap 6, p. 96 in PPMPI
*/
#include
#include "mpi.h"

main(int argc, char* argv[]) {
int p;
int my_rank;
float A[10][10];
MPI_Status status;
int i, j;

MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);

if (my_rank == 0) {
for (i = 0; i < 10; i++)
for (j = 0; j < 10; j++)
A[i][j] = (float) i;
MPI_Send(&(A[2][0]), 10, MPI_FLOAT, 1, 0,
MPI_COMM_WORLD);
} else { /* my_rank = 1 */
MPI_Recv(&(A[2][0]), 10, MPI_FLOAT, 0, 0,
MPI_COMM_WORLD, &status);
for (j = 0; j < 10; j++)
printf("%3.1f ", A[2][j]);
printf("\n");
}

MPI_Finalize();
} /* main */