#include <iostream>

using namespace std;

class Box{
    public:
        double length;
        double breadth;
        double height;
};

int main(){
    Box Box1;
    double volume=0.0;

    Box1.height=5.0;
    Box1.length=6.0;
    Box1.breadth=7.0;

    volume=Box1.height*Box1.length*Box1.breadth;
    cout << volume << endl;

    return 0;
}

#include <iostream>
#include <ctime>
 
using namespace std;
 
int main( )
{
   // 基于当前系统的当前日期/时间
   time_t now = time(0);
   
   // 把 now 转换为字符串形式
   char* dt = ctime(&now);
 
   cout << "本地日期和时间：" << dt << endl;
 
   // 把 now 转换为 tm 结构
   tm *gmtm = gmtime(&now);
   dt = asctime(gmtm);
   cout << "UTC 日期和时间："<< dt << endl;
}

#include<iostream>  
 
using namespace std;  
  
int main()  
{  
    cout << "type: \t\t" << "************size**************"<< endl;  
    cout << "bool: \t\t" << "所占字节数：" << sizeof(bool);  
    cout << "\t最大值：" << (numeric_limits<bool>::max)();  
    cout << "\t\t最小值：" << (numeric_limits<bool>::min)() << endl;  
    cout << "char: \t\t" << "所占字节数：" << sizeof(char);  
    cout << "\t最大值：" << (numeric_limits<char>::max)();  
    cout << "\t\t最小值：" << (numeric_limits<char>::min)() << endl;  
    cout << "signed char: \t" << "所占字节数：" << sizeof(signed char);  
    cout << "\t最大值：" << (numeric_limits<signed char>::max)();  
    cout << "\t\t最小值：" << (numeric_limits<signed char>::min)() << endl;  
    cout << "unsigned char: \t" << "所占字节数：" << sizeof(unsigned char);  
    cout << "\t最大值：" << (numeric_limits<unsigned char>::max)();  
    cout << "\t\t最小值：" << (numeric_limits<unsigned char>::min)() << endl;  
    cout << "wchar_t: \t" << "所占字节数：" << sizeof(wchar_t);  
    cout << "\t最大值：" << (numeric_limits<wchar_t>::max)();  
    cout << "\t\t最小值：" << (numeric_limits<wchar_t>::min)() << endl;  
    cout << "short: \t\t" << "所占字节数：" << sizeof(short);  
    cout << "\t最大值：" << (numeric_limits<short>::max)();  
    cout << "\t\t最小值：" << (numeric_limits<short>::min)() << endl;  
    cout << "int: \t\t" << "所占字节数：" << sizeof(int);  
    cout << "\t最大值：" << (numeric_limits<int>::max)();  
    cout << "\t最小值：" << (numeric_limits<int>::min)() << endl;  
    cout << "unsigned: \t" << "所占字节数：" << sizeof(unsigned);  
    cout << "\t最大值：" << (numeric_limits<unsigned>::max)();  
    cout << "\t最小值：" << (numeric_limits<unsigned>::min)() << endl;  
    cout << "long: \t\t" << "所占字节数：" << sizeof(long);  
    cout << "\t最大值：" << (numeric_limits<long>::max)();  
    cout << "\t最小值：" << (numeric_limits<long>::min)() << endl;  
    cout << "unsigned long: \t" << "所占字节数：" << sizeof(unsigned long);  
    cout << "\t最大值：" << (numeric_limits<unsigned long>::max)();  
    cout << "\t最小值：" << (numeric_limits<unsigned long>::min)() << endl;  
    cout << "double: \t" << "所占字节数：" << sizeof(double);  
    cout << "\t最大值：" << (numeric_limits<double>::max)();  
    cout << "\t最小值：" << (numeric_limits<double>::min)() << endl;  
    cout << "long double: \t" << "所占字节数：" << sizeof(long double);  
    cout << "\t最大值：" << (numeric_limits<long double>::max)();  
    cout << "\t最小值：" << (numeric_limits<long double>::min)() << endl;  
    cout << "float: \t\t" << "所占字节数：" << sizeof(float);  
    cout << "\t最大值：" << (numeric_limits<float>::max)();  
    cout << "\t最小值：" << (numeric_limits<float>::min)() << endl;  
    cout << "size_t: \t" << "所占字节数：" << sizeof(size_t);  
    cout << "\t最大值：" << (numeric_limits<size_t>::max)();  
    cout << "\t最小值：" << (numeric_limits<size_t>::min)() << endl;  
    cout << "string: \t" << "所占字节数：" << sizeof(string) << endl;  
    // << "\t最大值：" << (numeric_limits<string>::max)() << "\t最小值：" << (numeric_limits<string>::min)() << endl;  
    cout << "type: \t\t" << "************size**************"<< endl;  
    return 0;  
}

#include <cstdio>

int binarySearch(int A[],int left,int right,int x){
    //[left,right],初值[0,n-1]。
    int mid;
    //left和right的中点。
    while(left<=right){     //如果left>right就没有闭区间了。
        mid=(left+right)/2; //取中点。
        if(A[mid]==x)   return mid; //找x，返回下标。
        else if(A[mid]>x){  //中间数大于x。
            right=mid-1;    //左子区间[left,mid-1]查找。
        }else{              //中间数小于x。
            left=mid+1;     //右子区间[mid+1,right]查找。
        }
    }
    return -1;
}

int main(){
    const int n=10;
    int A[n]={1,3,4,6,7,8,10,11,12,15};
    printf("%d %d\n",binarySearch(A,0,n-1,6),binarySearch(A,0,n-1,9));
    return 0;
}

#include <stdio.h>

//数组名下标法
int main(){
    int i,a[10];
    for(i=0;i<10;i++){
        scanf("%d",&a[i]);
    }
    for(i=0;i<10;i++){
        printf("%5d",&a[i]);
    }
}

//指针下标法
    int i,a[10],*p;
    p=a;
    for(i=0;i<10;i++){
        scanf("%d",&p[i]);
    }
    for(i=0;i<10;i++){
        printf("%5d",i,p[i]);
    }

//数组名法
    int a[10],i;
    for(i=0;i<10;i++){
        scanf("%d",a+i);
    }
    for(i=0;i<10;i++){
        printf("%d",*(a+i));
    }

//指针变量法
    int a[10],i,*p;
    p=a;
    for(i=0;i<10;i++){
        scanf("%d",p+i);
    }
    for(i=0;i<10;i++){
        printf("%d",*(p+i));
    }

//指针自增运算
    int a[10],*p;
    for(p=a;p<a+10;p++){
        scanf("%d",p);
    }
    for(p=a;p<a+10;p++){
        printf("%d",*p);
    }