C++学习代码

Author: dairycode

Diff for: README.md

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+# C++学习代码
+## 学习资料源自:C++面向对象程序设计(第二版)
+## 学习资料作者:谭浩强

Diff for: 第1章 C++的初步知识/1.10_无法实现两个变量的值互换的程序.cpp

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+#include <iostream>
+using namespace std;
+
+void swap(int a,int b)
+{
+	int temp;
+	temp=a;
+	a=b;
+	b=temp;
+}
+
+int main()
+{
+	int i=3,j=5;
+	swap(i,j);
+	cout<<i<<","<<j<<endl;
+	return 0;
+}
+

Diff for: 第1章 C++的初步知识/1.11_使用指针变量作为形参,实现两个变量的值互换.cpp

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+#include <iostream>
+using namespace std;
+
+void swap(int *p1,int *p2)
+{
+	int temp;
+	temp=*p1;
+	*p1=*p2;
+	*p2=temp;
+}
+
+int main()
+{
+	int i=3,j=5;
+	swap(&i,&j);
+	cout<<i<<","<<j<<endl;
+	return 0;
+}

Diff for: 第1章 C++的初步知识/1.12_利用引用形参实现两个变量的值互换.cpp

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+#include <iostream>
+using namespace std;
+
+void swap(int &a,int &b)
+{
+	int temp;
+	temp=a;
+	a=b;
+	b=temp;
+}
+
+int main()
+{
+	int i=3,j=5;
+	swap(i,j);
+	cout<<"i="<<i<<" "<<"j="<<j<<endl;
+	return 0;
+}

Diff for: 第1章 C++的初步知识/1.13_将函数指定为内置函数.cpp

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+#include <iostream>
+using namespace std;
+
+inline int max(int a,int b,int c)
+{
+	if(b>a) a=b;
+	if(c>a) a=c;
+	return a;
+}
+
+int main()
+{
+	int i=7,j=10,k=25,m;
+	m=max(i,j,k);
+	cout<<"max="<<m<<endl;
+	return 0;
+}

Diff for: 第1章 C++的初步知识/1.14_局部变量和全局变量同名.cpp

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+#include <iostream>
+using namespace std;
+
+float a=13.5;
+
+int main()
+{
+	int a=5;
+	cout<<a<<endl;
+	return 0;
+}
+
+/*
+int main()
+{
+	int a=5;
+	cout<<a<<endl;	//输出局部变量a的值
+	cout<<::a<<endl;//输出全局变量a的值
+}
+*/

Diff for: 第1章 C++的初步知识/1.15_输入3个字符串,要求按字母由小到大顺序输出.cpp

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+#include <iostream>
+#include <string>
+using namespace std;
+
+int main()
+{
+	string string1,string2,string3,temp;
+	cout<<"Please input three strings:";
+	cin>>string1>>string2>>string3;
+	if(string2>string3) {temp=string2;string2=string3;string3=temp;}
+	//使串2<=串3
+	if(string1<=string2) cout<<string1<<" "<<string2<<" "<<string3<<endl;
+	//如果串1<=串2,则串1<=串2<=串3
+	else if(string1<=string3) cout<<string2<<" "<<string1<<" "<<string3<<endl;
+        //如果串1>串2,且串1<=串3,则串2<串1<=串3
+	else cout<<string2<<" "<<string3<<" "<<string1<<endl;
+        //如果串1>串2,且串1>串3,则串2<=串3<=串1
+	return 0;
+}

Diff for: 第1章 C++的初步知识/1.16_开辟空间以存放一个结构体变量.cpp

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+#include <iostream>
+#include <string>
+using namespace std;
+
+struct Student
+{
+	char name[10];
+	int num;
+	char sex;
+};
+
+int main()
+{
+	Student *p;
+	p=new Student;
+	strcpy(p->name,"Wang Yun");
+	p->num=10123;
+	p->sex='M';
+	cout<<p->name<<" "<<p->num<<" "<<p->sex<<endl;
+	delete p;
+	return 0;
+}

Diff for: 第1章 C++的初步知识/1.1_最简单的C++程序.cpp

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+#include <iostream>
+using namespace std;
+
+int main()
+{
+	cout<<"This is C++ program.\n";
+	return 0;
+}

Diff for: 第1章 C++的初步知识/1.2_求a,b两个数之和.cpp

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+#include <iostream>
+using namespace std;
+
+int main()
+{
+	int a,b,sum;
+	cin>>a>>b;
+	sum=a+b;
+	cout<<"a+b="<<sum<<endl;
+	return 0;
+}

Diff for: 第1章 C++的初步知识/1.3_求a,b两个数中的大者.cpp

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+#include <iostream>
+using namespace std;
+
+int main()
+{
+	int max(int x,int y);
+	int a,b,c;
+	cin>>a>>b;
+	c=max(a,b);
+	cout<<"max="<<c<<endl;
+	return 0;
+}
+
+int max(int x,int y)
+{
+	int z;
+	if(x>y) z=x;
+	else z=y;
+	return (z);
+}

Diff for: 第1章 C++的初步知识/1.4_包含类的C++程序.cpp

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+#include <iostream>
+using namespace std;
+
+class Student
+{
+private:
+	int num;
+	int score;
+public:
+	void setdate()
+	{
+		cin>>num;
+		cin>>score;
+	}
+	void display()
+	{
+		cout<<"num="<<num<<endl;
+		cout<<"score="<<score<<endl;
+	}
+};
+Student stud1,stud2;
+
+int main()
+{
+	stud1.setdate();
+	stud2.setdate();
+	stud1.display();
+	stud2.display();
+	return 0;
+}

Diff for: 第1章 C++的初步知识/1.5_用cin和cout实现数据的输入输出.cpp

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+#include <iostream>
+using namespace std;
+
+int main()
+{
+	cout<<"please enter your name and age:"<<endl;
+	char name[10];
+	int age;
+	cin>>name;
+	cin>>age;
+	cout<<"your name is "<<name<<endl;
+	cout<<"your age is "<<age<<endl;
+	return 0;
+}

Diff for: 第1章 C++的初步知识/1.6_求3个数中最大的数(分别考虑整数,实数,长整数).cpp

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+#include <iostream>
+using namespace std;
+
+int max(int a,int b,int c)
+{
+	if(b>a) a=b;
+	if(c>a) a=c;
+	return a;
+}
+
+float max(float a,float b,float c)
+{
+	if(b>a) a=b;
+	if(c>a) a=c;
+	return a;
+}
+
+long max(long a,long b,long c)
+{
+	if(b>a) a=b;
+	if(c>a) a=c;
+	return a;
+}
+
+int main()
+{
+	int a,b,c;
+	float d,e,f;
+	long g,h,i;
+	cin>>a>>b>>c;
+	cin>>d>>e>>f;
+	cin>>g>>h>>i;
+	int m;
+	m=max(a,b,c);
+	cout<<"max_i="<<m<<endl;
+	float n;
+	n=max(d,e,f);
+	cout<<"max_f="<<n<<endl;
+	long int p;
+	p=max(g,h,i);
+	cout<<"max_l="<<p<<endl;
+}

Diff for: 第1章 C++的初步知识/1.7_求2个整数或3个整数中的最大者.cpp

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+#include <iostream>
+using namespace std;
+
+int max(int a,int b,int c)
+{
+	if(b>a) a=b;
+	if(c>a) a=c;
+	return a;
+}
+
+int max(int a,int b)
+{
+	if(a>b) return a;
+	else return b;
+}
+
+int main()
+{
+	int a=7,b=-4,c=9;
+	cout<<"max_3="<<max(a,b,c)<<endl;
+	cout<<"max_2="<<max(a,b)<<endl;
+}

Diff for: 第1章 C++的初步知识/1.8_函数模板.cpp

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+#include <iostream>
+using namespace std;
+
+template <typename T>
+T max(T a,T b,T c)
+{
+	if(b>a) a=b;
+	if(c>a) a=c;
+	return a;
+}
+
+int main()
+{
+	int i1=8,i2=5,i3=6,i;
+	double d1=56.9,d2=90.765,d3=43.1,d;
+	long g1=67843,g2=-456,g3=78123,g;
+	i=max(i1,i2,i3);
+	d=max(d1,d2,d3);
+	g=max(g1,g2,g3);
+	cout<<"i_max="<<i<<endl;
+	cout<<"f_max="<<d<<endl;
+	cout<<"g_max="<<g<<endl;
+	return 0;
+}

Diff for: 第1章 C++的初步知识/1.9_引用的简单使用.cpp

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+#include <iostream>
+using namespace std;
+
+int main()
+{
+	int a=10;
+	int &b=a;
+	a=a*a;
+	cout<<a<<" "<<b<<endl;
+	b=b/5;
+	cout<<b<<" "<<a<<endl;
+	return 0;
+}

Diff for: 第2章 类和对象的特征/2.1_用类来实现输入和输出时间.cpp

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+#include <iostream>
+using namespace std;
+
+class Time
+{
+public:
+	int hour;
+	int minute;
+	int sec;
+};
+
+int main()
+{
+	Time t1;
+	cin>>t1.hour;
+	cin>>t1.minute;
+	cin>>t1.sec;
+	cout<<t1.hour<<":"<<t1.minute<<":"<<t1.sec<<endl;
+	return 0;
+}

Diff for: 第2章 类和对象的特征/2.2_用上例中的Time类,定义多个类对象,分别输入输出各对象中的时间.cpp

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+#include <iostream>
+using namespace std;
+
+class Time
+{
+public:
+        int hour;
+        int minute;
+        int sec;
+};
+
+int main()
+{
+        Time t1;
+        cin>>t1.hour;
+        cin>>t1.minute;
+        cin>>t1.sec;
+        cout<<t1.hour<<":"<<t1.minute<<":"<<t1.sec<<endl;
+	Time t2;
+        cin>>t2.hour;
+        cin>>t2.minute;
+        cin>>t2.sec;
+        cout<<t2.hour<<":"<<t2.minute<<":"<<t2.sec<<endl;
+        return 0;
+}