Question

Please dont copy from other answers. Do as simole as possible (C programming).

code 1:

create a program that will copy the contents of a text file called (input.txt) to a file called (copied.txt). After the program runs the contents of both files should be the same. (im creating the input manually)

code 2:

Change the code from fist part so that instead of always copying from input.txt to copied.txt it instead asks the user to provide both file names.

thank you. Ill give you thumbs up!

Answer 1

Solution

Code 1 - The code has been given below along with the output. Comments have been placed to depict the functionality.

#include <stdio.h>
int main()
{
    /*Create File Pointers*/
    FILE *fle, *flecopy;
    char ch;
    /*Open input file for reading */
    fle = fopen("input.txt", "r") ; 
    /* open output file in writing mode, file will be created if not existing*/
    flecopy = fopen("copied.txt","w");

    /*Return message if there is a problem opening the file*/
    if ( fle == NULL ) 
    { 
        printf( "Error Opening the file" ) ; 
    } 
    else
    { 
           while ( 1 )  
            {  
                /*Read file character by character*/
                ch = fgetc ( fle ) ;  
                if ( ch == EOF )  
                    break ;  
                /*Copy the character to the copied file*/    
                fputc(ch,flecopy) ;  
            } 
        /*Close the files*/                
        fclose (fle ) ;  
        fclose (flecopy); 
    }
    return 1;
}

Output:

input.txt = "This is the input file, its contents are to be copied."

copied.txt = Not existing before the program run.

copied.txt (after program run) = "This is the input file, its contents are to be copied."

Code 2 : Modified code where file names are given by the user.

#include <stdio.h>


int main()
{
    char inp[50],outp[50];
    /*ask user for the file names */
    printf("Enter the input file name : ");
    scanf("%s",inp);

    printf("Enter the file name to which contents are to be copied: ");
    scanf("%s",outp);

    /*Create File Pointers*/
    FILE *fle, *flecopy;
    char ch;
    /*Open input file for reading */
    fle = fopen(inp, "r") ; 
    /* open output file in writing mode, file will be created if not existing*/
    flecopy = fopen(outp,"w");

    /*Return message if there is a problem opening the file*/
    if ( fle == NULL ) 
    { 
        printf( "Error Opening the file" ) ; 
    } 
    else
    { 
           while ( 1 )  
            {  
                /*Read file character by character*/
                ch = fgetc ( fle ) ;  
                if ( ch == EOF )  
                    break ;  
                /*Copy the character to the copied file*/    
                fputc(ch,flecopy) ;  
            } 
        /*Close the files*/                
        fclose (fle ) ;  
        fclose (flecopy); 
    }
    return 1;
}

Ouput:

Enter the input file name : input.txt
Enter the file name to which contents are to be copied: newcopiedfile.txt

After the program runs the contents of the newcopiedfile.txt

"This is the input file, its contents are to be copied."