【C++】几个简单课本例题

//

//  main.cpp

//  2_1

//

//  Created by T.P on 2018/2/28.

//  Copyright © 2018年 T.P. All rights reserved.

//

#include <iostream>

#include <iomanip>

using namespace std;

int main() {

    cout<<"Hello!"<<endl;

    cout<<"Welcome to C++!"<<endl;

    cout<<setw(10)<<setprecision(3)<<3.1415<<endl;

    int score=61;

    cout<<(score>=60? "pass":"fail")<<endl

    <<endl;

    return 0;

}

//

//  main.cpp

//  2_2

//

//  Created by T.P on 2018/3/4.

//  Copyright © 2018年 T.P. All rights reserved.

//

//判断闰年

//:闰年可以被4整除而不能被100整除，或者能被400整除。

//表达式((year%4==0&&year%100!=0)||(year%400==0))

#include <iostream>

#include <iomanip>      //包含IO类库操作符

using namespace std;    //没写 using namespace std; 用 std::cout

                        //写了 using namespace std; 用 cout 就可以了。

int main(int argc, const char * argv[]) {

    // insert code here...

    //std::cout << "Hello, World!\n";

    int year;

    bool isLeapYear;

    cout<<"Enter the year:";

    cin>>year;

    isLeapYear=((year%4==0&&year%100!=0)||(year%400==0));

    if(isLeapYear)

        cout<<year<<"is a leap year"<<endl;

    else

        cout<<year<<" is not a leap year"<<endl;

    return 0;

}

//

//  main.cpp

//  2_3

//

//  Created by T.P on 2018/3/4.

//  Copyright © 2018年 T.P. All rights reserved.

//

//比较两个数的大小

#include <iostream>

#include <iomanip>

using namespace std;

int main(int argc, const char * argv[]) {

    int x,y;

    cout<<"Please Enter x and y : ";

    cin>>x>>y;

    cout<<endl;

    if(x!=y){

        if(x>y)

            cout << "x>y";

        else

            cout << "x<y";

    }

    else

        cout << "x=y";

    cout << endl;

    return 0;

}

//

//  main.cpp

//  2_4

//

//  Created by T.P on 2018/3/4.

//  Copyright © 2018年 T.P. All rights reserved.

//

//输入一个0~6的整数，转换成星期输出

#include <iostream>

#include <iomanip>

using namespace std;

int main(int argc, const char * argv[]) {

    // insert code here...

    //std::cout << "Hello, World!\n";

    int day;

    cin>>day;

    switch (day) {

        case 0:

            cout<<"Sunday";

            break;

        case 1:

            cout<<"Monday";

            break;

        case 2:

            cout<<"Tuesday";

            break;

        case 3:

            cout<<"Wednesday";

            break;

        case 4:

            cout<<"thursday";

            break;

        case 5:

            cout<<"Friday";

            break;

        case 6:

            cout<<"Saturday";

            break;

        default:

            cout<<"Day out of range Sunday...Saturday";

            break;

    }

    cout<<endl;

    return 0;

}

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【C++】几个简单课本例题

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