输入a b c d  输出 d c b a
#include <iostream.h>
#include<string.h>
void fun(char[]);
void main()
{
    char s[80];
    cout <<"请输入一个字符串:";
    cin >>s;
    cout <<"反序前:"<<s<<endl;
fun(s);
cout <<"反序后:"<<s<<endl;
}
void fun(char ss[])
{
    for (int i=0;i<n/2;i++)
    {
        char c=ss[i];
        ss[i]=ss[n-1-i];
        ss[n-1-i]=c;
}
}
提示 for (int i=0;i<n/2;i++) 'n' : undeclared identifier

谢谢你我成功了