C/C++练习

1.数组升序

#include<iostream>
using namespace std;
//冒泡排序
void bubbleSort(int* arr, int len) {
	for (int i = 0; i < len - 1; i++) {
		for (int j = 0; j < len - 1-i; j++) {
			if (arr[j] > arr[j + 1]) {
				int tmp = arr[j];
				arr[j] = arr[j + 1];
				arr[j + 1] = tmp;
			}
		}
	}
}
//打印输出
void printArray(int* arr, int len) {
	for (int i = 0; i < len ; i++) {
		cout << arr[i] <<" ";
	}
	cout << "\b" << endl;
}

int main() {
	int arr[10] = { 4,3,6,9,1,2,10,8,7,5 };
	int len = sizeof(arr) / sizeof(arr[0]);
	printArray(arr, len);
	bubbleSort(arr, len);
	printArray(arr, len);

	system("pause");
	return 0;
}

2.打印分数

#include<iostream>
#include<stdio.h>
#include<string>
#include<ctime>
using namespace std;

//Student必须写在Teacher前面
struct Student {
	string sName;
	int score;
}; 

struct Teacher {
	string tName;
	struct Student sArray[5];
};
//分配内容
void allocateSpace(struct Teacher tArray[], int len) {
	string nameSeed = "ABCDE";
	for (int i = 0; i < len; i++) {
		tArray[i].tName = "Teacher_";
		tArray[i].tName += nameSeed[i];

		for (int j = 0; j < 5; j++) {
			tArray[i].sArray[j].sName = "Student_";
			tArray[i].sArray[j].sName += nameSeed[j];

			int random=rand()%61+40;	//40~100分
			tArray[i].sArray[j].score=random;
		}
	}
}
//打印输出
void printInfo(struct Teacher tArray[], int len) {
	for (int i = 0; i < len; i++) {
		cout << "老师姓名：" << tArray[i].tName << endl;
		for (int j = 0; j < 5; j++) {
			cout << "\t学生姓名：" << tArray[i].sArray[j].sName <<
				" 考试分数：" << tArray[i].sArray[j].score << endl;
		}
	}
}

int main() {
	srand((unsigned int)time(NULL));
	struct Teacher tArray[3];
	int len = sizeof(tArray) / sizeof(tArray[0]);
	allocateSpace(tArray, len);
	printInfo(tArray, len);

	system("pause");
	return 0;
}

3.英雄排序

#include<iostream>
#include<string>
using namespace std;

struct Hero {
	string name;
	int age;
	string sex;
};
//冒泡排序
void bubbleSort(struct Hero heroArray[], int len) {
	for (int i = 0; i < len - 1; i++) {
		for (int j = 0; j < len - 1 - i; j++) {
			if (heroArray[j].age > heroArray[j + 1].age) {
				struct Hero tmp = heroArray[j];
				heroArray[j] = heroArray[j + 1];
				heroArray[j + 1] = tmp;
			}
		}
	}
}
//打印输出
void printArray(struct Hero heroArray[], int len) {
	for (int i = 0; i < len; i++) {
		cout <<"英雄：" <<heroArray[i].name<< "  年龄：" <<heroArray[i].age << "  性别：" <<heroArray[i].sex << endl;
	}
}

#include<iostream>
#include<string>
using namespace std;

struct Hero {
	string name;
	int age;
	string sex;
};

extern void bubbleSort(struct Hero heroArray[], int len);
extern void printArray(struct Hero heroArray[], int len);

int main() {
	struct Hero heroArray[5] = { 
		{"刘备",23,"男"},
		{"关羽",22,"男"},
		{"张飞",20,"男"},
		{"赵云",21,"男"},
		{"貂蝉",19,"女"},
	};
	int len = sizeof(heroArray) / sizeof(heroArray[0]);

	cout << "排序前：" << endl;
	printArray(heroArray, len);

	bubbleSort(heroArray, len);

	cout << "排序后：" << endl;
	printArray(heroArray, len);

	system("pause");
	return 0;
}

4.test1

#include<iostream>
#include<string>
using namespace std;

class Bag{
public:
    Bag(int b=30):br(b){cout<<br<<" ";}
    int fun() const {
        cout<<"const在函数上的用法";
        return this->br;
    }

private:
    int br;
};

template<class T1,typename T2,typename T3>
int fun(T1 a,T2 b,T3 c) {
    return 1;
}

int main(){

    Bag a[2];
    a[0].fun();

    const int b=0;
    int const c=0;
    cout<<b<<' '<<c<<endl;
    
    int d=1;
    const int *p=&d;
    cout<<p<<' '<<*p<<endl;
    cout<<&p<<endl;

    //开始先赋值，再判断，然后是否进入循环语句
    for(int i=0;i<0;i++)
        printf("1\n");

    // cout<<"你好"<<endl;
    // string str;
    // cin>>str;
    // cout<<str<<endl;

    Bag *p1;//=NULL;
    p1=NULL;
    delete p1;//delete可作用于空指针

    system("pause");
    return 0;
}

5.test2

#include<iostream>
#include<string>
#include <cstring>
using namespace std;

class Base{
public:
    void fun1(){cout<<"Base";}
    virtual void fun2(){cout<<"Base";}
};

class Derived:public Base{
public:
    void fun1(){cout<<"Derived";}
    void fun2(){cout<<"Derived";}
};

void f(Base b)//BaseBase//void f(Base& b)//BaseDerived
{
    b.fun1();
    b.fun2();
}

int main()
{
    // int b=10;
    // int &a;要赋初值

    // int c=1;
    // char c='d';
    // cout<<c<<endl;

    // string str;
    // str="12";
    // string *p;
    // p=&str;
    // int a=p;
    // cout<<a<<endl;

    char* p;
    p="1";
    int a=*p;
    cout<<a<<endl;

    char g[10]="f3r";
    cout<<g<<endl;
    //string c;
    char c[10];
    strcpy(c,"12e");//'24'
    cout<<c<<endl;

    char d='2';//'22';
    cout<<d<<endl;
    // char e[2]='22';
    // cout<<e<<endl;


    Derived obj;
    f(obj);
    return 0;
}