Cplus 实验一

比眉伴天荒 2021-12-23 22:27 202阅读 0赞

习题2-28源码

if...else版本

#include<iostream>
    using namespace std;
    int main()
    {
        cout<<"Menu:A(dd) D(elete) S(ort) Q(uit) Select one"<<endl;
        while(1){
        char selection;    
        int A,D,S,Q;
        cin>>selection;
        {
        if(selection=='A')
        cout<<"数据已经增加"<<endl;    
        else if(selection=='D')
        cout<<"数据已经删除"<<endl;
        else if(selection=='S')
        cout<<"数据已经排序"<<endl;
        else if(selection=='Q')
        break;}
    }
        return 0; 
    }

运行结果如图

![1359507-20190317181347629-789511915.png][]

switch版本

#include<iostream>
    using namespace std;
    int main()
    {
        cout<<"Menu:A(dd) D(elete) S(ort) Q(uit) Select one"<<endl;
        while(1){
        char(selection);
        int A,D,S,Q;
        cin>>selection;
        switch(selection){
        case'A':
            cout<<"数据已经增加"<<endl;
            break;
        case'D':
            cout<<"数据已经删除"<<endl;
            break;
        case'S':
            cout<<"数据已经排序"<<endl;
            break;
        }
        if(selection=='Q')
            break; 
        }
    }

运行结果如图

![1359507-20190317184242311-163012405.png][]

习题2-29源码

while版本

#include <iostream>
    #include <math.h>
    using namespace std;
    int main()
    {
    	int x,y,z,parameter;
    	x=2;
    	cout<<"1-100内质数有"<<" ";
    	while(x<=100){
    		y=1;
    		parameter=sqrt(x);
    		z=2;
    		while(z<=parameter){
    		if(x%z==0){
    	    y=0;
    	    break;}
    	    z++;}
    		if(y)
            cout<<x<<" ";
            x++;
    	}
    	}

运行结果如图

![1359507-20190317235453814-1589644146.png][]

do..while版本

#include <iostream>
    #include <math.h>
    using namespace std;
    int main()
    {
        int x,y,z,parameter;
        x=2;
        cout<<"1-100内质数有"<<" ";
        do{
            y=1;
            parameter=sqrt(x);
            z=2;
        do{
            if(x%z==0){
            y=0;
            break;}
            z++;}
            while(z<=parameter);
                if(y)
                cout<<x<<" ";
                x++;
                }
                while(x<=100);
    }

运行结果如下

![1359507-20190318002956998-815904782.png][]

for版本

#include <iostream>
    #include <math.h>
    using namespace std;
    int main()
    {
        int x,y,z,parameter;
        cout<<"1-100内质数有"<<" ";
        for(x=2;x<=100;x++){
            y=1;
            parameter=sqrt(x);
        for(z=2;z<=parameter;z++){
            if(x%z==0){
            y=0;
            break;}}
            if(y)
            cout<<x<<" ";
        }
        }

运行结果如下

![1359507-20190318003712506-771800777.png][]习题2-32源码

while版本

#include<iostream>
    using namespace std;
    int main()
    {
        int x,y;
        x=14;
        while(y!=x){
        cout<<"please input an number"<<endl;
        cin>>y;    
        if(y<x)
        cout<<"The number you guess is smaller than given"<<endl;
        else if(y>x)
        cout<<"The number you guess is bigger than given"<<endl;
        else
        cout<<"you are right"<<endl;}
    }

（emmm懒得中英文切换了就打了蹩脚的英语）

运行结果如下

![1359507-20190318011342608-1523016859.png][]

do...while版本

#include<iostream>
    using namespace std;
    int main()
    {
        int x,y;
        x=14;
        do{
        cout<<"please input an number"<<endl;
        cin>>y;
        if(y<x)
        cout<<"The number you guess is smaller than given"<<endl;
        else if(y>x)
        cout<<"The number you guess is bigger than given"<<endl;
        else
        cout<<"you are right"<<endl;}
        while(y!=x);
    }

运行结果如下

![1359507-20190318013102761-1562042750.png][]

习题2-34源码

转载于:https://www.cnblogs.com/heyha/p/10547872.html

[1359507-20190317181347629-789511915.png]: /images/20211223/f52f7eccd7d24828857bbcb8b084beef.png
[1359507-20190317184242311-163012405.png]: /images/20211223/e5d4a17fa4bb423891d75cdc32956806.png
[1359507-20190317235453814-1589644146.png]: /images/20211223/9db2b91e89614fd0a128cbca807233e3.png
[1359507-20190318002956998-815904782.png]: /images/20211223/a37f7c20341e4ba1aebffba6e592ae9f.png
[1359507-20190318003712506-771800777.png]: /images/20211223/0b9eed8b6a2244faa0f1d26f1c082d30.png
[1359507-20190318011342608-1523016859.png]: /images/20211223/450cf05c175c4d5caa344f3bbdc6a166.png
[1359507-20190318013102761-1562042750.png]: /images/20211223/079fef13994a4a299d4e2b457dad12aa.png