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#include <iostream>

#include <cstring>

using namespace std;

void swap(char &a, char &b){

a = a^b;

b = a^b;

a = a^b;

}

void reverse2(char *s){

int n = strlen(s);

for(int i=0; i<n/2; ++i)

swap(s[i], s[n-i-1]);

}

void reverse1(char *s){

if(!s) return;

char *p = s, *q = s;

while(*q) ++q;

--q;

while(p < q)

swap(*p++, *q--);

}

int main(){

char s[] = "1234567890";

reverse1(s);

cout<<s<<endl;

return 0;

}