Write a menu based program which allows users to calculate the area and perimeter of the following shapes :
1. Circle
2. Triangle
3. Rectangle
4. Square
The program should exit only when the user desires.
  #include <stdio.h>

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;
}