第七周

例题5-1

#include<iostream>
using namespace std;

void display()
{
	cout<<"This is an example."<<endl;
}

int main()
{
	display();
	return 0;
}

例题5-2

#include<iostream>
using namespace std;

double min(double x,double y)
{
	return x<y?x:y;
}

int main()
{
	cout<<min(6.0,5.0)<<endl;

	return 0;
}

例题5-3

#include<iostream>
using namespace std;

double circleArea(double);

int main()
{
	double area = circleArea(5.0);
	cout<<"area="<<area<<endl;
	return 0;
}

double circleArea(double r)
{
	double pi=3.14;
	double area =pi*r*r;
	return area;
}

例题5-4

#include<iostream>
using namespace std;

int sum(int x,int y)
{
	int temp;
	temp=x+y;
	return temp;
}

int main()
{
	int a,b,c;
	a=10;b=5;
	c=sum(a,b);
	cout<<a<<"+"<<b<<"="<<c<<endl;

	return 0;
}

例题5-5

#include<iostream>
using namespace std;

int ncomp(int i,int j)
{
	if(i>j)return 1;
	if(i==j)return 0;
	return-1;
}

int main()
{
	int k=2;
	int n=ncomp(k,++k);
	cout<<n;
	return 0;
}

例题5-6

#include<iostream>
using namespace std;

int max(int u,int v)
{
	int w;
	w=u>v?u:v;
	return w;
}

int main()
{
	int a,b,c;
	cout<<"please input two numbers:";
		cin>>a>>b;
	c=max(a,b);
	cout<<"a="<<a<<"b="<<b<<endl;
	cout<<"Max is"<<c<<endl;

	return 0;
}

例题5-7

#include<iostream>
using namespace std;
int sqr(int x)
{
	x=x*x;
	return x;
}

int main()
{
	int t=10;
	int s=sqr(t);
	cout<<"t="<<t<<'t'
		<<"sqr("<<t<<")="<<s<<endl;

	return 0;
}

例题5-8

#include<iostream>
using namespace std;
void swap(int u,int v);

int main()
{
	int a=3;
	int b=4;
	cout<<"a="<<a<<"\tv="<<b<<endl;
	swap(a,b);
	cout<<"a="<<a<<"\tb="<<b<<endl;

	return 0;
}

void swap(int u,int v)
{
	int temp;
	temp=u;
	u=v;
	v=temp;
}

例题5-9

#include<iostream>
using namespace std;

void swap(int &u,int &v);

int main()
{
	int a=3;
	int b=4;
	cout<<"a="<<a<<"\tb="<<b<<endl;
	swap(a,b);
	cout<<"a="<<a<<"\tb="<<b<<endl;

	return 0;
}

void swap (int &u,int &v)
{
	int temp=v;
	v=u;
	u=temp;
}

例题5-10

#include<iostream>
using namespace std;

void display(int x,float y)
{
	cout<<x<<""<<y;
	return;
}

int main()
{
	float a;
	int b;
	cin>>b>>a;
	display(b,a);

	return 0;
}

例题5-11