Write a c program to write text in the file

#include<stdio.h>

void main()

{

   FILE *p;

   char str[70];

   if((p=fopen("string.txt","w"))==NULL)

   {

      printf("\nUnable to open file string.txt");

      exit(1);

   }

   else

      printf("\nEnter a set of strings,Press just enter key to finish\n: ");

   while(strlen(gets(str))>0)

   {

      fputs(str,p);

      fputs("\n",p);

   }

   fclose(p);

   getch();

}