#include<iostream>
#include<fstream>
void main(void)
{
char strch,ch;
int i,x;
ifstream readfile;
ofstream writefile;
readfile.open("1.txt",ios::in | ios::nocreate);
if(!readfile)
{
cerr<<"cannot open thie file for input"<<endl;
exit(0); }
writefile.open("2.txt",ios::in | ios::nocreate);
if(!writefile)
{
cerr<<"cannot open the file for output"<<endl;
exit(0); }
while(!readfile.eof())
{
ch=readfile.get();
x=static_cast<int>(ch);
x=(x+3)%128;
strch=static_cast<char>(x);
writefile.put(strch);
}
}
