#include <stdio.h>
#include <stdlib.h>
#include <time.h> //random
#include <string.h> // char commands
#include <windows.h> //for colors [works only on windows]

//codes a text that the user inputs with the delay requested then decodes it in a file.

int main ()
{
   char str1[500];
   int delay = 0;
   int codedelay = 0;
   int chainlength = 0;
   int i = 0;
   FILE* fichier = NULL;

   fichier = fopen("decoder.txt", "w+");

   if(fichier != NULL)
   {
  	printf("Write a text\n\n");
  	fprintf(fichier, "Your text: \n\n");
  	fgets(str1, 1000, stdin);
  	fprintf(fichier, "%s", str1);
  	printf("How much delay should there be to your text(you may use negative delay too)?\n\n");
  	scanf("%d", &delay);
  	chainlength = strlen(str1);
 			for(i = 0; i < chainlength; i++)
 			{
 				codedelay = str1[i]+delay;
 				str1[i] = codedelay;
 			}
 		fprintf(fichier, "\n\nYour text coded:\n\n%s", str1);
 			for(i = 0; i < chainlength; i++)
 			{
 				codedelay = str1[i]-delay;
 				str1[i] = codedelay;
 			}
 		fprintf(fichier, "\n\nYour text decoded : \n\n%s", str1);
   }
   else
   {
   	printf("File could not be open");
   }
   fclose(fichier);

   return(0);
}