حساب مساحة الاشكال المختلفة

#include
#include
void main(){
clrscr();
char a;
int b,c;
float area;
area=0;
printf("menu:\n");
printf("1.Squar\n");
printf("2.rectangular\n");
printf("3.Triangle\n") ;
printf("4.suircuit\n");
printf("Enter your choice:");
scanf("%c",&a);
switch(a){
case '1':
printf("Enter the length=");
scanf("%d",&a);
area=a*a;
printf("The area is %f",area);
break;
case '2':
printf("Enter the length,width=");
scanf("%d%d",&a,&b);
area=a*b;
printf("The area is %f",area);
break;
case '3':
printf("Enter the base,height=");
scanf("%d%d",&a,&b);
area=(.5*a*b);
printf("The area is %f",area);
break;
case '4':
printf("Enter the radias=");
scanf("%d",&a);
area=(3.14*a*a);
printf("The area is %f",area);
break;
}
getch();
}