C语言编写能加减乘矩阵的程序

学弟的小练习

#include "stdafx.h"#include<stdlib.h>#include <stdio.h>//新建int **newArr(int X, int Y) {    int **p, i;    p = (int **)malloc(X * sizeof(int *));    for (i = 0; i < X; i++) {        p[i] = (int *)malloc(Y * sizeof(int));    }    return p;}//释放内存void deleteArr(int **p, int X) {    int i;    for (i = 0; i < X; i++)        free(p[i]);     free(p);}//计算矩阵相加    参数1:矩阵A 参数2:矩阵B 参数3:矩阵行数,列数int **addArr(int **A, int **B,int X,int Y){    int **p, i,j;    p = (int **)malloc(X * sizeof(int *));      for (i = 0; i < X; i++)             p[i] = (int *)malloc(Y * sizeof(int));    for (i = 0; i < X; i++)    {        for (j = 0; j < Y; j++)            p[i][j] = A[i][j] + B[i][j];            }    return p;}//计算矩阵相减    参数1:矩阵A 参数2:矩阵B 参数3:矩阵行数,列数int **subArr(int **A, int **B, int X, int Y){    int **p, i, j;    p = (int **)malloc(X * sizeof(int *));    for (i = 0; i < X; i++)        p[i] = (int *)malloc(Y * sizeof(int));    for (i = 0; i < X; i++)    {        for (j = 0; j < Y; j++)            p[i][j] = A[i][j] - B[i][j];    }    return p;}//计算矩阵相乘    参数1:矩阵A 参数2:矩阵B 参数3,4,5,6:矩阵行数,列数int **multiplyArr(int **A, int **B, int aX, int aY, int bX, int bY){    //A[aX][aY] * B[bX][bY] =C[aX][bY]    int **p, i,j,k;    p = (int **)malloc(aX * sizeof(int *));    for (i = 0; i < aX; i++)        p[i] = (int *)malloc(bY * sizeof(int));    for (i = 0; i < aX; i++)    {        for (j = 0; j < bY; j++)        {            p[i][j] = 0;        }    }    for (i = 0; i<aX; i++)     {        for (j = 0; j<bY; j++)         {            for (k = 0; k<aY; k++)             {                p[i][j] += A[i][k] * B[k][j];            }        }    }    return p;}//打印矩阵  参数1:矩阵  参数2,3:矩阵行数,列数void printArr(int **arr,  int X, int Y){    int i, j;    printf("输出矩阵开始:\n");    for (i = 0; i < X; i++) {        for (j = 0; j < Y; j++) {            printf(" %5d", arr[i][j]);        }        printf("\n");    }    printf("输出矩阵结束:\n");}void main(){    int **aArr, **bArr, i, j, aX, aY, bX, bY;    printf("输入矩阵A的行数:\n");    scanf("%d", &aX);    printf("输入矩阵A的列数:\n");    scanf("%d", &aY);    printf("输入A矩阵:\n");    aArr = newArr(aX, aY);    for (i = 0; i < aX; i++) {        for (j = 0; j < aY; j++) {            scanf("%d", &aArr[i][j]);        }    }    printf("输入矩阵B的行数:\n");    scanf("%d", &bX);    printf("输入矩阵B的列数:\n");    scanf("%d", &bY);    printf("输入B矩阵:\n");    bArr = newArr(bX, bY);    for (i = 0; i < bX; i++)    {        for (j = 0; j < bY; j++)            scanf("%d", &bArr[i][j]);    }    //打印 A,B 矩阵    printArr(aArr, aX, aY);    printArr(bArr, bX, bY);    //计算    //判断是否能进行加减运算    if (aX==bX&&aY==bY)    {        printf("矩阵A,B可进行加减运算\n");        //矩阵相加        int **resultAdd = addArr(aArr, bArr, aX, aY);        //打印矩阵相加结果        printArr(resultAdd, aX, aY);        //释放内存        deleteArr(resultAdd, aX);        //矩阵相减        int **resultSub = subArr(aArr, bArr, aX, aY);        //打印矩阵相减结果        printArr(resultSub, aX, aY);        //释放内存        deleteArr(resultSub, aX);    }    else    {        printf("矩阵A,B不可进行加减运算\n");    }    //判断是否能进行乘法运算    if (aY==bX)    {        printf("矩阵A,B可进行乘法运算\n");        int **resultMultiply = multiplyArr(aArr, bArr, aX, aY,bX,bY);        //打印矩阵相减结果        printArr(resultMultiply, aX, bY);        //释放内存        deleteArr(resultMultiply, aX);    }    else    {        printf("矩阵A,B不可进行乘法运算\n");      }    //释放内存    deleteArr(aArr, aX);    deleteArr(bArr, bX);}