mpihell

#include<mpi.h>
#include<stdio.h>
#include<stdlib.h>
#include<iostream>
#include<conio.h>
using namespace std;

int main(int argc, char** argv)
{
	int rank,size,len,handle;
	char str[50],str1[50],str2[50];
	MPI_Status status;
	MPI_Init(&argc,&argv);
	MPI_Comm_rank(MPI_COMM_WORLD,&rank);
	MPI_Comm_size(MPI_COMM_WORLD,&size);

	if(rank==0)
	{
		cout<<"Enter a string that is a multiple of 3\n";
		fflush(stdout);
		gets(str);
		fflush(stdin);
		len = strlen(str);
		handle = len/size;
		for(int i=1;i<size;i++)
		MPI_Send(&handle,1,MPI_INT,i,i,MPI_COMM_WORLD);
	}
	if(rank!=0)
	{
		MPI_Recv(&handle,1,MPI_INT,0,rank,MPI_COMM_WORLD,&status);
	}
	MPI_Scatter(&str[0],handle,MPI_CHAR,&str1[0],handle,MPI_CHAR,0,MPI_COMM_WORLD);
	for(int i=0;i<handle;i++)
	{
		str1[i] = str1[i] + 1;
	}
	MPI_Gather(&str1[0],handle,MPI_CHAR,&str2[0],handle,MPI_CHAR,0,MPI_COMM_WORLD);
	if(rank==0)
	{
		cout<<"Output is:\n";
		str2[len]='\0';
		puts(str2);
		fflush(stdout);
	}
	MPI_Finalize();
	getch();
	return 0;
}