C++ Program to implement File Handling with Command Line Arguments

Copy the contents of an existing file to a new file the names of which are taken as command line arguments. The program should handle errors if the given first file name does not already exist.

#include

#include

#include

#include

#include

 

void main(int argc, char *argv[]){

    char src[12], dest[12];

    char buff[1000];

    int len;

    clrscr();

 

    if(argc > 3){

        cout<<"\n Illegal Number of Arguments."<

        exit(1);

        }

    else if(argc == 2){

        cout<<"\n Enter the Destination File."<

        cin>>dest;

        }

    else if(argc == 1){

        cout<<"\n Enter Source and Destination File."<

        cin>>src;

        cin>>dest;

        }

    else{

        strcpy(src, argv[1]);

        strcpy(dest, argv[2]);

        }

 

    ifstream fin;

    fin.open(src, ios::in);

 

    if(!fin){

        cerr<<"\n File Does not Exist.";

        getch();

        exit(1);

        }

    fin.read((char*)&buff, sizeof(buff));

    fin.close();

 

    len = strlen(buff) - 1;

 

    ofstream fout;

    fout.open(dest, ios::out);

    fout.write((char*)&buff, len);

    fout.close();

 

    cout<<"\n File copied Successfully.";

 

    getch();

    }