UVA 272 TEX Quotes

#include <iostream>
#include <cstdlib>
#include <string>

using namespace std;

int main(int argc, char *argv[])
{
string str;
bool flag = true;
while(getline(cin , str))
{
for(int i = 0 ; str[i] != '\0' ; i++){
if(str[i] == '\"'){
if(flag)
printf("``");
else
printf("''");
flag = !flag;
}else{
printf("%c",str[i]);
}
}
printf("\n");
}
return 0;
}