while (i!=1) {
		if (((strcmp(username, "maths")==0) && (strcmp(password, "123a")==0)) || ((strcmp(username, "stats")==0) && (strcmp(password, "4321")==0))) {
			i=1;
		}

		else {
			printf("			       Username : ");
			scanf("%s",&username);
			printf("\n			       Password : ");
			scanf("%s",&password);
		}
	}
		printf(             "\n\t\t     ********* RESERVATION *********\n\n");
		printf("\tAn taksideuete monh sas parakalw pathste 0, an oxi pathste 1 : ");
		scanf("%d",&ppljn);

		printf("\n\tTha parete kapoio katoikidio mazi sas? : ");
		scanf("%s",&qfp);