/*** Example of formatted file usage ***/
#include<stdio.h>

int main(){
   int pos;
   char c, text[100];
   FILE *f;

   // Opening file
   f=fopen("file.txt","w+");
   if(f==NULL){
      fprintf(stderr," There is a file opening problem!\n");
      return 1;
      }

   // Write the file
   fprintf(stdout," What word would you like to write into the file?\n   ");
   fscanf(stdin,"%s",text);
   fprintf(f,"%s",text);

   // Positioning and rewriting
   fprintf(stdout," Let's owerwrite something!\n  From which character? Give a number! ");
   fscanf(stdin,"%d",&pos);
   fprintf(stdout,"  What is the new text? ");
   fscanf(stdin,"%s",text);
   fseek(f,pos-1,SEEK_SET);
   fprintf(f,"%s",text);

   // Reading the file
   fprintf(stdout," Now the file contetnt is:\n   ");
   fseek(f,0,SEEK_SET);
   while(1){
      fscanf(f,"%c",&c);
      if(feof(f)) break;
      fprintf(stdout,"%c",c);
      }

   // Closing the file
   fclose(f);

   return 0;
   }