使用switch case语句编写的C程序，用于计算几何图形的面积

#include <stdio.h>
void main(){
   int fig_code;
   float side, base, length, breadth, height, area, radius;
   printf("-------------------------</p><p>");
   printf(" 1 --> Circle</p><p>");
   printf(" 2 --> Rectangle</p><p>");
   printf(" 3 --> Triangle</p><p>");
   printf(" 4 --> Square</p><p>");
   printf("-------------------------</p><p>");
   printf("Enter the Figure code</p><p>");
   scanf("%d", &fig_code);
   switch(fig_code){
      case 1:
         printf(" Enter the radius</p><p>");
         scanf("%f",&radius);
         area=3.142*radius*radius;
         printf("Area of a circle=%f</p><p>", area);
         break;
      case 2:
         printf(" Enter the breadth and length</p><p>");
         scanf("%f %f",&breadth, &length);
         area=breadth *length;
         printf("Area of a Rectangle=%f</p><p>", area);
         break;
      case 3:
         printf(" Enter the base and height</p><p>");
         scanf("%f %f", &base, &height);
         area=0.5 *base*height;
         printf("Area of a Triangle=%f</p><p>", area);
         break;
      case 4:
         printf(" Enter the side</p><p>");
         scanf("%f", &side);
         area=side * side;
         printf("Area of a Square=%f</p><p>", area);
         break;
      default:
      printf(" Error in figure code</p><p>");
      break;
   }
}

Run 1:
-------------------------
1 --> Circle
2 --> Rectangle
3 --> Triangle
4 --> Square
-------------------------
Enter the Figure code
3
Enter the base and height
4
7

Area of a Triangle=14.000000

Run 2:
-------------------------
1 --> Circle
2 --> Rectangle
3 --> Triangle
4 --> Square
-------------------------
Enter the Figure code
1
Enter the radius
8
Area of a circle=201.087997