C++基础知识（三）

# include<iostream>#include<string>
using namespace std;
int main(){
  string name = "Audrey Hepburn";  int age = 18;  string country = "Belgium";    cout << "Her name is:\t" << name << endl;  cout<< "Her age is:\t" << age << endl;  cout << "She comes from:\t"<<country<< endl;
  system("pause");  return 0;  }

Her name is:    Audrey HepburnHer age is:     18She comes from: Belgium

# include<iostream>#include<string>
using namespace std;
int main(){  int age = 0;
  cout << "Please input your age:\t" << endl;  cin >> age;
  if (age < 0){    cout << "The age is nagtive!\a" << endl;;  }  else  {    cout << "your age is:\t" << age << endl;  }
  system("pause");  return 0;}

Please input your age:-10The age is nagtive!

# include<iostream>#include<string>
using namespace std;
int main(){  bool judge = 0;  cout << "明天上午有没有早八课\?" << endl;  cin >> judge;
  if (judge == true){    cout << "明天上午要上早八。" << endl;  }  else{    cout << "明天上午可以睡懒觉。" << endl;  }    system("pause");  return 0;}

明天上午有没有早八课?1明天上午要上早八。

明天上午有没有早八课?0明天上午可以睡懒觉。

#include<iostream>#include<string>
using namespace std;
int main(){
  int age =0;  string name = "";  bool gender = 0;
  cout << "Please input your name:\t";  cin >> name;
  cout << "Please input your age:\t";  cin >> age;
  cout << "Please input gender(1 means male and 0 means female):\t";  cin >> gender;

  cout << "Your name is:\t" << name<<endl;  cout << "Your age is:\t" << age<<endl;  if (gender == 1){    cout << "Your gender is:" << "male" << endl;      }  else{    cout << "Your gender is:" << "female" << endl;  }
  system("pause");  return 0;}

Please input your name: tudouerPlease input your age:  19Please input gender(1 means male and 0 means female):   1Your name is:   tudouerYour age is:    19Your gender is:male