#include <iostream.h>
void main();
{
     cout<<"Do you want a random number?(Y/N)";
     char chAnswer;
     cin>>chAnswer;
     if (chAnswer == 'N')
         goto DONE
     else
   
    int nRandom=rand();
    cout<<"The random number created by rand()  function is "<<nRandom<<endl;
}   

#include <iostream>
using namespace std;
void main() // main()后面没；
{
    cout<<"Do you want a random number?(Y/N)";
    char chAnswer;
    cin>>chAnswer;
    if (chAnswer == 'N')
        goto DONE;
    else
    {}
    int nRandom=rand();
    cout<<"The random number created by rand()  function is "<<nRandom<<endl;
DONE:cout<<endl;

}  

不行啊！还是错哦！

加上rand的头文件

#include <iostream.h>
using namespace std;
int main()
{
     cout<<"Do you want a random number?(Y/N)"<<endl;
     char chAnswer;
     cin>>chAnswer;
     if (chAnswer == 'N')
         goto DONE;
     else
     {
        int nRandom=rand();
        cout<<"The random number created by rand()  function is "<<nRandom<<endl;
     }
    DONE:
        cout<<"Thank you !!"<<endl;
}   



我是用GCC调试的，成功了