Question

In C Programming Language, write a simple program to read one text file and print to screen all its text. Make use of the stderr and exit program statements should there not be only one text file identified on the command line. If successful then before fclose of the text file, use the fputs program statement to write a line "72 degrees Sunny light wind. Nice!\n". print the return code of fputs (should be zero). close and exit.

Test program on the Command Prompt line, or Terminal, running the executable and text file. e.g. c:\program.exe textfile.txt

Answer 1

Code - file name - input.txt from content to be read or write

#include <stdio.h>
#include <conio.h>
void main()
{
   FILE *fp,*fw;
   char s;

//input file name
   fp=fopen("input.txt","r");

   if(fp==NULL)
   {
       printf("\nFile not present");
       getch();
   exit(0);
   }
   else
   {
   do
{
       s=getc(fp);
       printf("%c",s);
   }
   while(s!=EOF);
}
//to write to a file
   fw=fopen("input.txt","w");
   fputs("72 degrees Sunny light wind. Nice!\n", fw);
fclose(fp);
   getch();
   exit(0);
}