reverse string (by urjnasw xkfjjkn @ CSDN)

#include <iostream>
#include <string>

using namespace std ;

void reverse(char *str)
{
char *end = str ;
char temp ;
if (str)
{
while (*end)
{
end++;
}
end--;
while (str != end)
{
temp = *str ;
*str++ = *end ;
*end-- = temp ;
}
}
}

void main()
{
char a[100] ;
cin >> a;
reverse(a);
cout << a ;

}