> #include<stdio.h>
> #include<math.h>
> void main()
> {
> float a,b,pi=3.1415926,r;
> int y,no=1;
> scanf("%f %f\n",&a,&b);
> if(a>0)-------------------->while(a>0)
> {
>  r=a*a+b*b;
>  y=ceil(r*pi/50);
> printf("Property %d:This property will begin eroding in year %d\n",no,y);
> scanf("%f %f\n",&a,&b);
> no++;
> }
> printf("END OF OUTPUT.");
> }