I don't know how can i conver c++ code to c# code can ypu help me? code: /* 2 * This is a MPI based sorting program. 3 * Copyright (c) Microsoft Corporation. All rights reserved. 4 */ #include "mpi.h" #include <stdio.h> #include <stdlib.h> #include <string.h> #include <math.h> int rank, size; #define MAX_ALLOC_SIZE 1000000000 int isValidAlloc(int alloc){ return (alloc>0&&alloc<MAX_ALLOC_SIZE); } void swap(int* data, int i, int j){ int t; t = data[i]; data[i] = data[j]; data[j] = t; } // Q-sort algorithm void myqsort(int* data, int left, int right){ int i,last; if(left>=right||left<0||right<0) return; //swap(data,left,(left+right)/2); last = left; for(i=left+1;i<=right;i++) if(data[i]<data[left]) swap(data,++last,i); swap(data,left,last); myqsort(data,left,last-1); myqsort(data,last+1,right); } void qSort(int* buf , int bufSize){ myqsort(buf, 0, bufSize-1); } // Bubble sort algorithm void bubbleSort(int* buf, int bufSize){ for(int i=0;i<bufSize;i++) for(int j=0;j<bufSize-i-1;j++){ if(buf[j]>buf[j+1]) swap(buf, j, j+1); } } // Merging sort algorithm void merge(int* input, int* output, int bufSize, int totalSize){ int* track=(int*)calloc(size, sizeof(int)); if(!track) MPI_Abort(MPI_COMM_WORLD, -1); for(int i=0;i<totalSize;i++){ int min=INT_MAX; int minsite=-1; for(int j=0;j<size;j++){ if(track[j]<bufSize&&*(input+bufSize*j+track[j])<=min){ min=*(input+bufSize*j+track[j]); minsite=j; } } output[i]=min; track[minsite]++; } if(track) free(track); } // Reads the sequence data and scatters to all the processes. void init_root(char* input_fn, int** smallBuffer, int* bufSize, int* cnt){ FILE* fp=fopen(input_fn, "r"); if(!fp){ printf("Can't find the file: %sn.", input_fn); fflush(stdout); MPI_Abort(MPI_COMM_WORLD, -1); } fscanf_s(fp, "%d", cnt); *bufSize=*cnt/size+1; int toAlloc=sizeof(int)**bufSize*size; if(!isValidAlloc(toAlloc)) MPI_Abort(MPI_COMM_WORLD, -1); int* bigBuffer=(int*)malloc(toAlloc); if(!bigBuffer) MPI_Abort(MPI_COMM_WORLD, -1); for(int i=0;i<*bufSize*size;i++) *(bigBuffer+i)=INT_MAX; toAlloc=sizeof(int)**bufSize; if(!isValidAlloc(toAlloc)) MPI_Abort(MPI_COMM_WORLD, -1); *smallBuffer=(int*)malloc(toAlloc); if(!smallBuffer) MPI_Abort(MPI_COMM_WORLD, -1); int proc=0; int iter=0; for(int i=0;i<*cnt;i++){ fscanf_s(fp, "%d", bigBuffer+proc**bufSize+iter); if(++proc==size){ proc=0; iter++; } } if(fp) fclose(fp); MPI_Bcast(bufSize, 1, MPI_INT, 0, MPI_COMM_WORLD); MPI_Scatter(bigBuffer, *bufSize, MPI_INT, *smallBuffer, *bufSize, MPI_INT, 0, MPI_COMM_WORLD); if(bigBuffer) free(bigBuffer); } // Gets the sequence data scattered from the root process. void init_worker(int** smallBuffer, int* bufSize){ int* bigBuffer=NULL; MPI_Bcast(bufSize, 1, MPI_INT, 0, MPI_COMM_WORLD); int toAlloc=sizeof(int)**bufSize; if(!isValidAlloc(toAlloc)) MPI_Abort(MPI_COMM_WORLD, -1); *smallBuffer=(int*)malloc(toAlloc); if(!smallBuffer) MPI_Abort(MPI_COMM_WORLD, -1); MPI_Scatter(bigBuffer, *bufSize, MPI_INT, *smallBuffer, *bufSize, MPI_INT, 0, MPI_COMM_WORLD); } void main(int argc, char* argv[]){ MPI_Init(&argc, 0); MPI_Comm_rank(MPI_COMM_WORLD, &rank); MPI_Comm_size( MPI_COMM_WORLD, &size ); if(argc!=3){ if(rank==0){ printf("Usage: mpiexec -np <nProcs> sort.exe <input_file> <output_file>n"); fflush(stdout); } MPI_Finalize(); return; } char* input_fn=argv[1]; char* output_fn=argv[2]; int* inBuf=NULL; int bufSize=0; int totalSize=0; if(rank==0) init_root(input_fn, &inBuf, &bufSize, &totalSize); else init_worker(&inBuf, &bufSize); int *tmpBuf,*finalBuf; tmpBuf=finalBuf=NULL; if(rank==0) { int toAlloc=sizeof(int)*bufSize*size; if(!isValidAlloc(toAlloc)) MPI_Abort(MPI_COMM_WORLD, -1); tmpBuf=(int*)malloc(toAlloc); if(!tmpBuf) MPI_Abort(MPI_COMM_WORLD, -1); toAlloc=sizeof(int)*totalSize; if(!isValidAlloc(toAlloc)) MPI_Abort(MPI_COMM_WORLD, -1); finalBuf=(int*)malloc(toAlloc); if(!finalBuf) MPI_Abort(MPI_COMM_WORLD, -1); } // Chooses a sorting algorithm for each process respectively. void (*mysort)(int*, int)=(rank%2?qSort:bubbleSort); //(*mysort) (int*, int) = qSort ; // Sorting mysort(inBuf, bufSize); // Gathers all the sorted sections back to the root process. MPI_Gather(inBuf, bufSize, MPI_INT, tmpBuf, bufSize, MPI_INT, 0, MPI_COMM_WORLD); if(rank==0) { // Merges all the well-sorted sequence sections together to the final result. merge(tmpBuf, finalBuf, bufSize, totalSize); // Outputs to file. FILE* fp=fopen(output_fn, "w"); if(!fp) MPI_Abort(MPI_COMM_WORLD, -1); fprintf(fp, "%dn", totalSize); for(int i=0;i<totalSize;i++){ fprintf(fp, "%d ", *(finalBuf+i)); } if(fp) fclose(fp); } if(inBuf) free(inBuf); MPI_Finalize(); } thanks

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