Chapter 16, Problem 1E

Type in and run the program presented in this chapter. Check the program’s results by comparing the original file you chose to copy with the filename you entered to copy and ensure the two are the same.

Program Plan Intro

Program Plan:

• Include the required headers.
• Define the structure
• Define the main method
  • Declare the required variables.
  • Condition to validate the arguments that are passed.
  • Based on the condition that are is specified, proper resultant is being displayed.

Program Description Answer

The program is used to copy the contents of the text file 1 to the text file 2 by passing the arguments as the commands.

Explanation of Solution

//include the necessary headers

#include<stdio.h>

#include<stdlib.h>

//main method

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

{

//declare the required variables

FILE *in,*out;

int c;

//condition to validate the arguments that are passed

if(argc!=3)

{

//prompt user to enter the files

fprintf(stderr,"Need two files names\n");

//return the value

return 1;

}

//condition to validate the arguments that are passed

if((in=fopen (argv[1],"r"))==NULL)

{

//prompts the user that the file cannot be read

fprintf(stderr,"can't read %s.\n",argv[1]);

//return

return 2;

}

//condition to validate the arguments present

if((out = fopen(argv[2],"w"))==NULL)

{

//prompts user about the write error

fprintf(stderr,"can't write %s.\n",argv[2]);

//return value

return 3;

}

//loop that iterates for the end of file

while((c=getc(in))!=EOF)

//write the contents

putc(c,out);

//display file has been copied

printf("File has been copied.\n");

//close the file

fclose(in);

//close the file

fclose(out);

//return 0

return 0;

}

Sample Output

File has been copied.

• The above code is executed by passing the test file in the form of commands.
• Type the following for making the code to run:

Main.c test.txt test1.txt

test.txt:

Programming is fun

test1.txt:

Programming is fun

After executing bove commands the contents of the “test.txt” is being copied to “test1.txt” as shown above.