小弟刚开始学习C++，请问下面这个程序要实现字符串的升序排列，需要怎么改

#include <iostream.h>
#include <string.h>
void main()
{
    char * str[]={"Follow me","basic","great wall","department","computer"};
    char * p;
    int i,j;
    for(i=0;i<5;i++)
        for(j=i+1;j<5;j++)
        {
            if(strcmp(str[i],str[j]>0))
            { p=str[j];str[j]=str[i];str[i]=p;}
        }
    for(i=0;i<5;i++)
    {cout<<str[i]<<endl;}

}