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

	int main(int argc, char * argv[]) {
	int myrank, mysize;
	int buf[100];

	MPI_Status status;

	MPI_Init(&argc, &argv);
	MPI_Comm_rank(MPI_COMM_WORLD, &myrank);
	MPI_Comm_size(MPI_COMM_WORLD, &mysize);

	if (myrank == 0) {
	MPI_Send(buf, 100, MPI_INT, 1, 0, MPI_COMM_WORLD);
	} else if (myrank == 1) {
	MPI_Recv(buf, 100, MPI_INT, 0, 0, MPI_COMM_WORLD, &status);
	}

	MPI_Finalize();
	}