第七周作业1

例题部分

1

#include "stdafx.h"#include<iostream>using namespace std;void display(){     cout<<"This is an example."<<endl;}int main(){     display();     return 0;}

2.

#include "stdafx.h"#include<iostream>using namespace std;float min(float x,float y){return x<y?x:y;}int main(){cout<<min(6.0,5.0)<<endl;return 0;}

3.

#include "stdafx.h"#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;}

4.

#include "stdafx.h"#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;}

5.

#include "stdafx.h"#include<iostream>using namespace std;int ncomp=(int i,int j){if(i>j) return 1;if(i==j) return 0;else -1;}int main(){        int k=2;int n=ncomp(k,k++);cout<<nreturn 0;}

6.

#include "stdafx.h"#include<iostream>#include<iomanip>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;}

7.

#include "stdafx.h"#include<iostream>#include<iomanip>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;}

8.

#include "stdafx.h"#include<iostream>#include<iomanip>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;temp=u;u=v;v=temp;}

9.

#include "stdafx.h"#include<iostream>#include<iomanip>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;}

10.

#include "stdafx.h"#include<iostream>#include<iomanip>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;}

11.