第二章

Posted 2022-10-26 shen-jiangqin

 1 //强制转换
 2 #include<iostream>
 3 using namespace std;
 4 int main() 
 5     int a(4);
 6     //将4赋值给a
 7     double b =a;
 8     cout << b <<endl<<sizeof(b)<<endl << sizeof(a)<<endl;
 9     return 0;
10 

 1 //强制转换
 2 #include<iostream>
 3 using namespace std;
 4 int main() 
 5     double a(4.3);
 6     //将4.3赋值给a
 7     int b =(a+0.5);
 8        //四舍五入方法
 9     cout << b <<endl;
10     return 0;
11 

//第二章
#include<iostream>
using namespace std;
int main() 
    int a = ‘a‘;
    char b = 98;
    //内存中，字符以ASCII码存放，即以整数存储，故字符与整型可互换
    int c = NULL;
    char d =NULL;
    //a输出97，b输出字符a，c输出0，d输出一个空
    cout << a <<endl<< b<<endl<<c<<endl<<d<<endl;
    return 0;