矩阵乘法.txt

用于计算多边形的面积,体积,长度, 用于操作系统的开发 用于数据的加密

#include<iostream.h>
#include<iomanip.h>
int a[3][4]={{5,7,8,2},{-2,4,1,1},{1,2,3,4}};
int b[4][5]={{4,-2,3,3,9},{4,3,8,-1,2},{2,3,5,2,7},{1,0,6,3,4}};
int c[3][5];
int MultiMatrix(int a[][4],int arow,int acol,int b[][5],int brow,int bcol,int c[][5],int crow,int ccol);
void main()
{
	if(MultiMatrix(a,3,4,b,4,5,c,3,5))
	{
		cout<<"illegal matrix multiplication.\n";
		return;
	}
	for(int i=0;i<3;i++)
	{
		for(int j=0;j<5;j++)
			cout<<setw(5)<<c[i][j];
		cout<<endl;
	}
}
int MultiMatrix(int a[][4],int arow,int acol,int b[][5],int brow,int bcol,int c[][5],int crow,int ccol)
{
	if(acol!=brow)
		return 1;
	if(crow!=arow)
		return 1;
	if(ccol!=bcol)
		return 1;
	for(int i=0;i<crow;i++)
		for(int j=0;j<ccol;j++)
		{
			c[i][j]=0;
			for(int n=0;n<acol;n++)
				c[i][j]+=a[i][n]*b[n][j];
		}
		return 0;
}