//**********************
//** ch15_7.cpp **
//**********************
#include <iostream.h>
#include <stdlib.h>
class Vector{
public:
Vector(int);
~Vector(){ delete[]v; } //将堆中数组空间返还
Vector(Vector & );
int Size(){ return sz; }
void Display();
int& Elem(int); //返回向量元素
protected:
int* v; //指向一个数组,表示向量
int sz; //元素个数
};
Vector::Vector(int s)
{
if(s<=0){
cerr <<"bad Vector size.\n";
exit(1);
}
sz=s;
v =new int[s]; //从堆中分配一个数组存放向量元素
}
int& Vector::Elem(int i) //引用返回的目的是返回值可以作左值
{
if(i<0||sz<=i){
cerr <<"Vector index out of range.\n";
exit(1);
}
return v[i];
}
Vector::Vector(Vector& vec)
{
v = new int[sz=vec.sz];
memcpy((void*)v,(void*)vec.v,sz*sizeof(int));
}
void Vector::Display()
{
for(int i=0; i<sz; i++)
cout <<v[i] <<" ";
cout <<endl;
}
class Matrix{
public:
Matrix(int,int);
Matrix(Matrix & );
~Matrix(){ delete[]m; }
int SizeL(){ return szl; }
int SizeR(){ return szr; }
int& Elem(int,int);
protected:
int* m;
int szl;
int szr;
};
Matrix::Matrix(int i,int j)
{
if(i<=0||j<=0){
cerr <<"bad Matrix size.\n";
exit(1);
}
szl=i;
szr=j;
m =new int[i*j];
}
Matrix::Matrix(Matrix& mat)
{
szl=mat.szl;
szr=mat.szr;
m=new int[szl*szr];
memcpy((void*)m,(void*)mat.m, szl*szr*sizeof(int));
}
int& Matrix::Elem(int i,int j) //引用返回的目的是返回值可以作左值
{
if(i<0||szl<=i||j<0||szr<=j){
cerr <<"Matrix index out of range.\n";
exit(1);
}
return m[i*szr+j];
}
Vector Multiply(Matrix& m, Vector& v) //矩阵乘向量的普通函数
{
if(m.SizeR()!=v.Size()){
cerr <<"bad multiply Matrix with Vector.\n";
exit(1);
}
Vector r(m.SizeL()); //创建一个存放结果的空向量
for(int i=0; i<m.SizeL(); i++){
r.Elem(i)=0;
for(int j=0; j<m.SizeR(); j++)
r.Elem(i) +=m.Elem(i,j)*v.Elem(j);
}
return r;
}
void main()
{
Matrix ma(4,3);
ma.Elem(0,0)=1; ma.Elem(0,1)=2; ma.Elem(0,2)=3;
ma.Elem(1,0)=0; ma.Elem(1,1)=1; ma.Elem(1,2)=2;
ma.Elem(2,0)=1; ma.Elem(2,1)=1; ma.Elem(2,2)=3;
ma.Elem(3,0)=1; ma.Elem(3,1)=2; ma.Elem(3,2)=1;
Vector ve(3);
ve.Elem(0)=2; ve.Elem(1)=1; ve.Elem(2)=0;
Vector va =Multiply(ma,ve);
va.Display();
}
c＋＋程序设计教材（钱能）源代码
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2008-10-05
19:57:12
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c＋＋程序设计教材（钱能）源代码 （198个子文件） 
ch15_7.cpp 2KB jose3.cpp 2KB jose2.cpp 2KB jose6.cpp 1KB ch7_12.cpp 1KB jose1.cpp 1KB ch18_1.cpp 1KB ch16_3.cpp 1KB ch21_3.cpp 1KB josexx.cpp 1KB ch16_1.cpp 1KB ch15_6.cpp 1KB ch18_5.cpp 1KB ring.cpp 1KB ch15_4.cpp 1KB josex.cpp 1012B ch15_1.cpp 996B ch11_5.cpp 977B ch18_4.cpp 958B ch10_11.cpp 945B ch9_8.cpp 930B ch18_2.cpp 920B ch10_6.cpp 916B ch14_2.cpp 914B ch9_7.cpp 909B ch4_9.cpp 908B ch10_5.cpp 903B ch8_6.cpp 877B ch18_7.cpp 858B ch7_11.cpp 850B ch12_3.cpp 831B ch7_10.cpp 827B ch18_3.cpp 823B ch12_6.cpp 816B ch17_2.cpp 813B ch8_26.cpp 808B ch14_1.cpp 807B ch12_1.cpp 802B ch7_9.cpp 774B ch17_4.cpp 773B ch14_4.cpp 747B ch19_16.cpp 743B ch19_14.cpp 718B ch17_3.cpp 716B ch12_11.cpp 716B ch12_12.cpp 693B ch12_10.cpp 693B student.cpp 674B ch10_10.cpp 671B ch19_3.cpp 669B ch17_1.cpp 657B ch12_2.cpp 657B ch10_9.cpp 648B ch4_8.cpp 636B ch9_5.cpp 624B ch8_9.cpp 621B ch2_1.CPP 619B ch8_8.cpp 599B ch5_2.cpp 596B ch18_6.cpp 585B ch8_24.cpp 585B ch12_5.cpp 580B ch12_7.cpp 573B ch9_3.cpp 573B ch7_2.cpp 570B ch16_4.cpp 569B ch11_1.cpp 559B ch10_7.cpp 542B ch10_8.cpp 538B ch8_14.cpp 529B ch14_3.cpp 524B ch4_4.cpp 522B ch21_1.cpp 514B ch7_7.cpp 513B ch11_4.cpp 508B ch7_8.cpp 500B ch9_11.cpp 498B ch8_7.cpp 498B ch8_3.cpp 496B ch11_6.cpp 492B ch21_2.cpp 490B ch7_6.cpp 479B ch12_4.cpp 479B ch16_5.cpp 477B ch16_2.cpp 473B ch8_25.cpp 467B ch9_6.cpp 463B ch10_4.cpp 461B ch15_5.cpp 458B ch17_5.cpp 457B ch6_5.cpp 453B ch10_3.cpp 449B ch8_20.cpp 448B student.cpp 434B ch4_7.cpp 433B ch19_4.cpp 429B ch12_8.cpp 428B ch5_3.cpp 418B ch8_5.cpp 417B ch4_6.cpp 408B共 198 条
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