课本与课件例题

p225求一串数字的最大值最小值

#include "iostream"

using namespace std;

void f(int a[],int n,int &max,int &min)

{

max=min=a[0];

for (int i=1;i

{

if (max

if (min>a[i]) min=a[i];

}

}

void main()

{

int a[10]={2,5,2,9,0,8,6,1,7,4};

int max,min;

f(a,10,max,min);

cout << "Max:" << max << endl;

cout << "Min:" << min << endl;

system("pause");

}

p230求一元二次方程的根

#include "iostream"

#include "math.h"

using namespace std;

int solve(double a,double b,double c,double &x1,double &x2) { double d;

int count;

d=b*b-4*a*c;

if (d>0)

{

count=2;

x1=(-b+sqrt(d))/(2*a);

x2=(-b-sqrt(d))/(2*a);

}

else if (d==0)

{ count=1;

x1=(-b)/(2*a);

}

else count=0;

return count;

}

void disp(double a,double b,double c)

{ double x1,x2;

cout << "(" << a << "," << b << "," << c << "):";

switch (solve(a,b,c,x1,x2))

{

case 0:

cout<< "无实根"<< endl;

break;

case 1:

cout << "x=" << x1 << endl;

break;

case 2:

cout << "x1=" << x1 << ",x2=" <

break;

}

}

void main()

{ disp(2,6,4);

disp(2,4,2);

disp(5,2,3);

system("pause");

}

p237将成绩转化为等级

#include"iostream"

#include"string"

#include"iomanip"

using namespace std;

class stud

{

char name[10];

int deg;

char level[7];

public:

stud(char na[],int d){strcpy(name,na);deg=d;}

char *getname(){return name;}

friend void trans(stud&s)

{

if(s.deg >=90)

strcpy(s.level,"优");

else if(s.deg >=80)

strcpy(s.level,"良");

else if(s.deg >=70)

strcpy(s.level,"中");

else if(s.deg >=60)

strcpy(s.level ,"及格");

else strcpy(s.level,"不及格");

}

void disp()

{cout<<" "<

}

};

void main()

{

stud st[]={stud("王华",78),stud("李明",92),stud("张伟",62),stud("孙强",88)};

cout<<"输出结果"<

for(int i=0;i<4;i++)

{

trans(st[i]);

st[i].disp();

}

system("pause");

}

p242银行例题

#include"iostream"

using namespace std;

class BBank; //这里预先说明，类BBank在后面定义

class GBank; //这里预先说明，类GBank在后面定义

class CBank //说明中国银行类CBank

{

private:

int balance;

public:

CBank() {balance=0;}

CBank(int b) {balance=b;}

void getbalance(){

cout<<"输入中国银行存款数:";

cin>>balance;

}

void disp(){

cout<<"中国银行存款数:"<

}

friend void total(CBank,BBank,GBank);

};

class BBank //说明工商银行类Bbank {

private:

int balance;

public:

BBank() { balance=0; }