共性规则

 1 #include <iostream>
 2 
 3 /* run this program using the console pauser or add your own getch, system("pause") or input loop */
 4 using namespace std;
 5 int main(int argc, char** argv) {
 6        //测试表达式类型的转换
 7     int n=100,m;
 8     double x=3.791,y;
 9     cout<<"n*x="<<n*x<<endl;
10     
11     //赋值类型转换
12     m=x;
13     y=n;
14     cout<<"m="<<m<<endl;
15     cout<<"y="<<y<<endl;
16 
17     //强制类型转换
18     cout<<"int(x)="<<int(x)<<endl;
19     cout<<"(int)x="<<(int)x<<endl;
20     cout<<"int(1.732+x)="<<int(1.732+x)<<endl;
21     cout<<"(int)1.732+x="<<(int)1.723+x<<endl;
22     cout<<"double(100)="<<double(100)<<endl;
23     return 0;
24 }