Question

SOLUTION IN C##

Write a program that reads every line in a text file, line by line. Obtain the name of the existing file and the name of the new (copy) of the file by prompting the user for both of these on the console. Make sure that the original file exists and can be read. If not, display a warning message and allow the user to either abort the program or enter a new file name. If the name of the new file to copy the text into already exists, then display a warning message and ask the user if they wish to overwrite the existing file or change the file name. If they wish to give a new name, then go through the same procedure as you did with the first name. After you have copied the file successfully, you should display to the user the name of the original file that was copied and the name of the file it was copied to successfully. (A sample file “textfile.txt” has been included along with this assignment in the dropbox to assist you in your programming)

Answer 1

#include <stdio.h>

#include <stdlib.h> // For exit()

int main()

{

    FILE *fptr1, *fptr2;

    char filename[100], c;

    printf("Enter the filename to open for reading \n");

    scanf("%s", filename);

      // Open one file for reading

    fptr1 = fopen(filename, "r");

    if (fptr1 == NULL)

    {

        printf("Cannot open file %s \n", filename);

      exit(0);

    }

      printf("Enter the filename to open for writing \n");

scanf("%s", filename);

   // Open another file for writing

    fptr2 = fopen(filename, "w");

    if (fptr2 == NULL)

    {

        printf("Cannot open file %s \n", filename);

        exit(0);

    }

    // Read contents from file

    c = fgetc(fptr1);

    while (c != EOF)

    {

        fputc(c, fptr2);

        c = fgetc(fptr1);

}

printf("\nContents copied to %s", filename);

fclose(fptr1);

    fclose(fptr2);

    return 0;

}

Output:

Enter the filename to open for reading

a.txt

Enter the filename to open for writing

b.txt

Contents copied to b.txt