Menu based program which allows users to calculate the area of Shapes

Menu based program which allows users to calculate the area of Shapes.

#include 

int main(void)
{
 char choice;

 do
 {
  
printf("\n\'C\'ircle\n\'T\'riangle\n\'R\'ectangle\n\'S\'quare\n\'E\'xit\nChoice :");
  fflush(stdin);
  scanf("%c", &choice);

  switch(choice)
  {
   case 'c':
   case 'C':
   {
    float radius;
    printf("Enter the radius :");
    scanf("%f", &radius);
    printf("\nArea of circle is %f", 3.14 * radius * radius);
    printf("\nPerimeter of circle is %f", 2 * 3.14 * radius);
    break;
   }
   case 't':
   case 'T':
   {
    float base, ht;
    printf("Enter the base and height :");
    scanf("%f%f", &base, &ht);
    printf("\nArea of triangle is %f", 0.5 * base * ht);
    break;
   }
   case 'r':
   case 'R':
   {
    float length, breadth;
    printf("Enter the length and breadth :");
    scanf("%f%f", &length, &breadth);
    printf("\nArea of rectangle is %f", length * breadth);
    printf("\nPerimeter of rectangle is %f", 2 * (length + breadth));
    break;
   }
   case 's':
   case 'S':
   {
    float side;
    printf("Enter the side :");
    scanf("%f", &side);
    printf("\nArea of square is %f", side * side);
    printf("\nPerimeter of square is %f", 4 * side);
    break;
   }
   default :
    printf("\nInvalid choice");
  }
 }while(choice != 'E' && choice != 'e');

 return 0;
}

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