[cpcs 202 - برمجة 1] لديك سؤال , شيء غير مفهوم ,,, تفضل هنا , موضوع مفيد

[NaSeM]

#include<stdio.h>
#include<conio.h>
void main ()
{
	char x,y;
	double l=0,w=0,h=0,r=0,s=0;
      printf("Enter:\na for circumference or b for area\n");
	   scanf("%c",&x);
      printf("Enter:\n    s for Square\n or r for rectangle\n or c for Circle\n or t FOR Tringle\n");
	   scanf("%c",&y);

	     switch(x)
    {
		 case 'a':
       {
		    if (y=='s'||y=='S')
          {
				printf("enter l for length\n");
			    scanf("%lf",&l);
				printf("the area of square is equal to ( %f )",l*l);
           }
			else if (y=='r'||y=='R')
          {
				printf("enter w for width and h height for\n ");
			    scanf("%lf %lf",&h,&w);
				printf("the area of Rectangle is equal to ( %f )",w*h);
           }
			else if (y=='c'||y=='C')
           {
				printf("enter r for radius\n ");
				scanf("%lf",&r);
				printf("the area of circle is equal to ( %f )",3.14*r*r);
           }
			else if (y=='t'||y=='T')
          {
				printf("enter h for vertical height and s for base\n ");
				scanf("%lf%lf",&h,&s);
				printf("the area of circle is equal to ( %f )",.5*s*h);
           }
			else
          {
				printf("error choice,try again");
          }
      }
		break;

		 case 'b':
       {
		    if (y=='s'||y=='S')
          {
				printf("enter l for length\n");
			    scanf("%lf",&l);
				printf("the circumference of square is equal to ( %f )",4*l);
           }
			else if (y=='r'||y=='R')
           {
				printf("enter the two sides h and w\n ");
				scanf("%lf %lf",&h,&w);
				printf("the circumference of Rectangle is equal to ( %f )",2*w*2*h);
           }
			else if (y=='c'||y=='C')
           {
				printf("enter r for radius\n ");
				scanf("%lf",&r);
				printf("the circumference of circle is equal to ( %f )",2*3.14*r);
           }
			else if (y=='t'||y=='T')
           {
				printf("enter the three sides h , s and w\n ");
				scanf("%lf%lf%lf",&h,&s,&w);
				printf("the circumference of circle is equal to ( %f )",h+s+w);
            }
			else
            {
				printf("error choice,try again");
            }
        }
	    break;

		 default : printf("error choice,try again");
 	}
getch();
}

إيش الخطأ اللي عندي ؟؟
لمن اسوي رن ادخل الخيار الاول وبعدها لمن اجي ادخل الخيار الثاني يروح على طول عا (defalt ( error choice بدون مايسوي العمليات والمفروض مايروح للـerror choice !!!!!!??