#include <stdio.h>

int main ()
{
      char name[30];
      float tax, income, allowance, net_chargeable;
      int maritial, children, parent;
      int more = 1;				// Boolean

      while (more)
      {
	      printf("Name? ");
	      scanf("%s", &name);

	      allowance = 30000;

	      do {
	            printf("Total annual income? ");
	            scanf("%f", &income);
	      } while (income < 0);

	      do {
	            printf("Marital status (1=Single, 2=Married)?  ");
	            scanf("%d", &maritial);
	      } while ((maritial != 1) && (maritial != 2));

	      if (maritial == 2)
	      {
	            allowance = allowance + 30000;
	            do {
	                  printf("Number of children?  ");
	                  scanf("%d", &children);
	            } while (children < 0);

	            if (children <= 5)
	                  allowance = allowance + 10000 * children;
	            else
	                  allowance = allowance + 50000;
	      }

	      do {
	            printf("Number of dependent parents?  ");
	            scanf("%d", &parent);
	      } while (parent < 0);

	      allowance = allowance + 15000 * parent;

	      net_chargeable = income - allowance;

	      if (net_chargeable < 0)
	            tax = 0;
	      else if (net_chargeable < 20000)
	            tax = net_chargeable * 0.1;
	      else if (net_chargeable < 40000)
	             tax = 20000 * 0.1 + (net_chargeable - 20000) * 0.2;
	      else
	             tax = 20000 * 0.1 + 20000 * 0.2 + (net_chargeable - 40000) * 0.3;

	      if (tax > income * 0.25)
        	     tax = income * 0.25;

	      printf("Tax for %s is $%.0f\n", name, tax);

	      do {
		      printf("\nAny more (yes=1/no=0)? ");
		      scanf("%d", &more);
	      } while ((more != 1) && (more != 0));

	      printf("\n");
      }
	      return 0;
}