C/C++实现矩阵各种运算
程序很简单，重要的是二维指针的动态分配内存type **Matrix ;//row为行,col为列Matrix=(type **) malloc(row*sizeof(type *)) ;
for(int i=0; i<row; i++)
Matrix = (type *)malloc(col * sizeof(type ));
类似数组a，他一共两行，每一行有3个元素，所以为他先分配两行内存，然后每一行再分配3列内存
Matrix类型是type**，先为它分配row行内存，内存类型与Matrix一样
Matrix=(type**) malloc(rowsizeof(type))
每一行分配col列内存，内存类型与Matix一样，也就是type*
Matrix = (type*)malloc(col * sizeof(type ));
其中一个功能的结果：
下面是完整代码#include <iostream>
#include <malloc.h>
#include <stdio.h>
using namespace std;
typedef struct
{
//结构体
int row,col;
//二维指针，目的是动态分配内存
float **matrix;
} Matrix;
typedef struct
{
char *name;
char *number;
} Student;
Matrix CreateMatrix()
{
Matrix m;
int row,col;
cout << "输入行数与列数：" << endl;
cin >> row >> col;
float **enterMatrix ;
enterMatrix=(float**) malloc(row*sizeof(float*)) ;
for(int i=0; i<row; i++)
enterMatrix = (float *)malloc(col * sizeof(float));
cout<<"输入你的矩阵："<<endl;
for(int i=0; i<row; i++)
{
for(int j=0; j<col; j++)
{
cin >> enterMatrix;
}
}
m.col = col;
m.row = row;
m.matrix = enterMatrix;
return m;
}
//初始化一个行为row列为col矩阵
Matrix InitMatrix(int row,int col)
{
Matrix m;
float **matrix ;
matrix=(float**) malloc(row*sizeof(float*)) ;
for(int i=0; i<row; i++)
matrix = (float *)malloc(col * sizeof(float));
for(int i=0; i<row; i++)
{
for(int j=0; j<col; j++)
{
matrix = 0;
}
}
m.col = col;
m.row = row;
m.matrix = matrix;
return m;
}
Matrix add(Matrix m1, Matrix m2)
{
for(int i=0; i<m1.row; i++)
{
for(int j=0; j<m1.col; j++)
{
m1.matrix = m1.matrix +m2.matrix;
}
}
return m1;
}
Matrix sub(Matrix m1, Matrix m2)
{
for(int i=0; i<m1.row; i++)
{
for(int j=0; j<m1.col; j++)
{
m1.matrix = m1.matrix -m2.matrix;
}
}
return m1;
}
int calRowCol(Matrix M1,Matrix M2,int row,int col)//row为M1的行 col为m2的列
{
int result = 0;
int same = M1.col;
for(int j=0; j<same; j++)
{
result+=M1.matrix*M2.matrix;
}
return result;
}
Matrix Mul(Matrix m1, Matrix m2)
{
Matrix result = InitMatrix(m1.row,m2.col);
for(int i=0; i<m1.row; i++)
{
for(int j=0; j<m2.col; j++)
{
result.matrix = calRowCol(m1,m2,i,j);
}
}
return result;
}
Matrix numMul(Matrix m, int num)
{
cout<<"数值:"<<num<<endl;
for(int i=0; i<m.row; i++)
{
for(int j=0; j<m.col; j++)
{
m.matrix = m.matrix*num;
}
}
return m;
}
Matrix printMatrix(Matrix m)
{
for(int i=0; i<m.row; i++)
{
for(int j=0; j<m.col; j++)
{
cout << m.matrix << "";
}
cout<<endl;
}
}
int main()
{
int num = 0;
do
{
cout<<"*************************************\n";
cout<<"* 菜单 *\n";
cout<<"* 1.矩阵相加 *\n";
cout<<"* 2.矩阵相减 *\n";
cout<<"* 3.矩阵相乘 *\n";
cout<<"* 4.矩阵数乘 *\n";
cout<<"* 5.退出 *\n";
cout<<"*************************************\n";
cin>>num;
if(1 == num|| 2 == num || 3 == num)
{
cout<<"请输入矩阵1"<<endl;
Matrix m1 = CreateMatrix();
cout<<"请输入矩阵2"<<endl;
Matrix m2 = CreateMatrix();
cout<<"两矩阵为"<<endl;
printMatrix(m1);
cout<<endl;
printMatrix(m2);
switch(num)
{
case 1:
{
if(m1.col!=m2.col || m1.row!=m2.row)
{
cout<<"行列不同"<<endl;
}
else{
cout<<"结果为："<<endl;
printMatrix(add(m1,m2));
}
break;
}
case 2:
{
if(m1.col!=m2.col || m1.row!=m2.row)
{
cout<<"参数错误"<<endl;
}
else{
cout<<"结果为："<<endl;
printMatrix(sub(m1,m2));
}
break;
}
case 3:
{
if(m1.col!=m2.row)
{
cout<<"参数错误"<<endl;
}
else{
cout<<"结果为："<<endl;
printMatrix(Mul(m1,m2));
}
break;
}
default:
break;
}
}
else if(4 == num)
{
int number = 1;
cout<<"请输入矩阵"<<endl;
Matrix m = CreateMatrix();
cout<<"请输入数值"<<endl;
cin>>number;
cout<<"矩阵为："<<endl;
printMatrix(m);
cout<<"数值为："<<endl;
cout<<number<<endl;
printMatrix(numMul(m,number));
}
cout<<"按回车继续....";
getchar();
getchar();
system("cls");
}
while(1 == num|| 2 == num || 3 == num ||4 == num);
return 0;
}
学生党表示很舒适~~~~ fuut115 发表于 2020-6-17 15:08
学生党表示很舒适~~~~
为啥? 啥也不说了，加入收藏！ 支持学逆向论坛，资源不错！ 非常喜欢学逆向论坛，资源我先收下了！ 太给力了，这么多好东西！ roger 发表于 2020-6-17 15:25
为啥?
有用啊~~~~~~~~~~~
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