#include <iostream>
#include <fstream>
#include <stdlib.h>
using namespace std;
int main(int argc, char *argv[]){
if(argc!=4){
cout << "Usage: change <filename> <byte> <character>" << endl;
exit (1);
}
fstream out(argv[1], ios::in | ios::out | ios::binary);
if(!out)
{
cout << "Cannot open file!";
exit (1);
}
out.seekp(atoi(argv[2]), ios::beg);
out.put(*argv[3]);
out.close();
}
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