Introduction to Cryprography: Write a program to create a copy of a text file in the same directory.

Program:

#include<stdio.h>

#include<conio.h>

#include<stdlib.h>

void main()

{

    FILE *fs,*ft;

    char ch;

    clrscr();

    fs = fopen("vk.txt","r");

    if(fs==NULL)

    {

    printf("Cannot open source file ! Press key to exit.");

    getch();

    exit(0);

    }

    ft = fopen("ck.txt","w");

    if(ft==NULL)

    {

    printf("Cannot copy file ! Press key to exit.");

    fclose(fs);

    getch();

    exit(0);

    }

    while(1)

    {

    ch = getc(fs);

    if(ch==EOF)

    {

    break;

    }

    else

    putc(ch,ft);

    }

    printf("File copied succesfully!");

    fclose(fs);

    fclose(ft);

}