How do you open a text file inputted from the user on C

Question

I just started learning C and I am trying to get this type of code:

Enter text file: cat.txt

Then when it runs it should display all the text but if it is not a valid text file it should throw an error

Answer 1

use something like this

#include <stdio.h>
#include <stdlib.h>

int main()
{
   char ch, file_name[25];
   FILE *fp;

   printf("Enter the name of file you wish to see\n");
   gets(file_name);

   fp = fopen(file_name,"r"); // read mode

   if( fp == NULL )
   {
      perror("Error while opening the file.\n");
      exit(EXIT_FAILURE);
   }

   printf("The contents of %s file are :\n", file_name);

   while( ( ch = fgetc(fp) ) != EOF )
      printf("%c",ch);

   fclose(fp);
   return 0;
}