Program to open a file whose name is passed as command line argument

Program to open a file whose name is passed as command line argument

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# include<iostream.h>
# include<conio.h>
# include<fstream.h>
# include<process.h>

void main(int argc,char *argv[])
{
if(argc < 2)
{
cerr<<"Illegal Usage
Correct Usage: size <file-name>";
exit(1);
}
ifstream in(argv[1],ios::in|ios::binary);
if(!in)
{
cerr<<"Error opening the input file";
exit(1);
}
long int size=0;
char ch;
while(!in.eof())
{
in>>ch;
// cout<<ch;
size++;
}
cout<<"The size of file "<<argv[1]<<" is "<<size<<" bytes.";

}