I have a file named plain.txt contain an integer for example 2500 I want to open this file and read the integer then compare it with another integer!! here I want to compare the value of plain text with K. how can I save the value of into another integer to compare??

int main(){
   int c,k=2000;
   FILE  *f;
   f=fopen("plain.txt", "r");
   c=getc(f);
   while(c!=EOF){
      putchar(c);
      c=getc(f);
   }
   fclose(f);

   return 0;
}