代码1 # include<iostream>
int namespace std;
using main(){
    cout << "hello!" << endl;
    cout << "welcome to c++!" << endl;
    return 0;
}


代码2 # incloude<stdio.h>
int main()
{
printf ("whna12.\n");
return o;
}
 代码1 出现 error C2447: “{”: 缺少函数标题(是否是老式的形式表?)
代码2 正常