矩阵的输入输出demo code...

#include <iostream.h>#include <math.h>#include <memory.h>/*函数声明*//*为矩阵分配空间并且初始化为0*/void allocMemAndInit(int ***matrixName, int rowNum, int columnNum);/*释放空间*/void deallocMem(int **matrixName, int rowNum, int columnNum);/*矩阵输入*/void inputMatrix(int ***matrixName, int* rowNum, int* columnNum);/*矩阵输出*/void outputMatrix(int** matrixName, int rowNum, int columnNum);/***********************************end*********************************//*函数定义*/void allocMemAndInit(int ***matrixName, int rowNum, int columnNum){if(matrixName == NULL){return;}//first free the former memerydeallocMem(*matrixName, rowNum, columnNum);*matrixName = new int*[rowNum];for(int i=0; i<rowNum; i++){(*matrixName)[i] = new int[columnNum];memset((*matrixName)[i], 0x0000, sizeof(columnNum * sizeof(int)));}}//used to dealloc the memoryvoid deallocMem(int **matrixName, int rowNum, int columnNum){if(matrixName == NULL){return;}for(int i= 0; i< rowNum; i++){if(matrixName[i] != NULL){delete[] matrixName[i];matrixName[i] = NULL;}}delete[] matrixName;matrixName = NULL;}void inputMatrix(int ***matrixName, int* rowNum, int* columnNum){if(matrixName == NULL){cout<<"Bad pointer"<<endl;return;} cout<<"Please input the row number of the matrix: ";cin>>*rowNum;cout<<endl;cout<<"Please input the column number of the matrix: ";cin>>*columnNum;cout<<endl;allocMemAndInit(matrixName, *rowNum, *columnNum);for(int i=0; i<(*rowNum); i++){for(int j=0; j<(*columnNum); j++){cout<<"Please input the row: "<<i<<"th, "<<"column: "<<j<<"th value: ";cin>>(*matrixName)[i][j];cout<<endl;}}}void outputMatrix(int** matrixName, int rowNum, int columnNum){if(matrixName == NULL){return;}cout<<"The input matrix is a "<<rowNum<<" * "<<columnNum<<" and the value is as follow:"<<endl;for(int i=0; i<rowNum; i++){for(int j=0; j<columnNum; j++){cout<<matrixName[i][j]<<" ";}cout<<endl;}}void main(){int rowNum = 0;int columnNum = 0;int** matrixName = NULL;inputMatrix(&matrixName, &rowNum, &columnNum);outputMatrix(matrixName, rowNum, columnNum);deallocMem(matrixName, rowNum, columnNum);}