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cpp基础语法

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#include<iostream>
#include<string>
#include<cstring>
#include<algorithm>


using namespace std;
int main() {
    cout << "Hello, World!" << endl;

    int a=3;
    float b=3.41f;
    float* b1=&b;
    double c=4.8888;
    char d='a';
    char* d1=&d;
    bool e = false;
    cout <<"int a*2="<<a*2;
    cout <<"\nfloat b*2="<<*b1*2;
    cout <<"\ndouble c*2="<<c*2;
    cout <<"\nchar d*2="<<string(2,*d1);
    cout <<"\nbool e*2="<<e*2;
    cout <<"\nchar d*2="<<d*2;

    for (int i=0;i<10;i++){
        if(i<a){
            cout<<"\nwork double c*i="<<c*i;
        }
    }

    double arr[10];
    for (int i=0;i<10;i++){
        arr[i]=i*2.0;
        cout<<"\narr["<<i<<"]="<<arr[i];
    }


    return 0;
}

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Hello, World!
int a*2=6
float b*2=6.82
double c*2=9.7776
char d*2=aa
bool e*2=0
char d*2=194
work double c*i=0
work double c*i=4.8888
work double c*i=9.7776
arr[0]=0
arr[1]=2
arr[2]=4
arr[3]=6
arr[4]=8
arr[5]=10
arr[6]=12
arr[7]=14
arr[8]=16
arr[9]=18