1. Open a sequential file in write-only mode and point to it with a file pointer:

fp = fopen (argv[1], "w");

2. Enter the content for the file when prompted:

printf("Enter content for the file
");
gets(str);

3. Enter stop when you are done entering the file content:

while(strcmp(str, "stop") !=0)

4. If the string you entered is not stop, the string is written into the file:

fputs(str,fp);

5. Close the file pointer to release all the resources allocated to the file:

fclose(fp);

The createtextfile.c program for creating a sequential file is as follows:

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

void main (int argc, char* argv[])
{
   char str[255];
   FILE *fp;

  fp = fopen (argv[1], "w");
  if (fp == NULL) {
     perror ("An error occurred in creating the file
");
    exit(1);
  }
  printf("Enter content for the file
");
  gets(str);
  while(strcmp(str, "stop") !=0){
      fputs(str,fp);
      gets(str);
  }
  fclose(fp);
}

Now, let's go behind the scenes to understand the code better.