do{

		printf("Years of service : 		\n								");//input years of service
		gotoxy(20,2);
		scanf("%i",&yearsofservice);
			if(yearsofservice>15){
			restart=0;
			printf("\nServed for more than 15 years");
			printf("\nTotal annual leave per year = %i days",totalannualleave=annualleave+15);

			}else if(yearsofservice>6&&yearsofservice<15){
			restart=0;
			printf("\nServed for more than 6 years but less than 15 years");
			printf("\nTotal annual leave per year = %i days",totalannualleave=annualleave+10);

			}else if(yearsofservice<6){
			restart=0;
			printf("\nServed for less than 6 years");
			printf("\nTotal annual leave per year = %i days",totalannualleave=annualleave);

			}else{
			printf("\nThere has typing error");
			restart=1;
			gotoxy(20,2);
			}
}while(restart==1);