使用switch case语句编写的C程序，用于计算几何图形的面积

问题

使用switch case语句找出矩形、正方形、三角形、圆的面积 User need to enter base, height, side, radius, breadth and length at runtime to calculate the areas of all geometrical figures.

Solution

The solution to find the areas of rectangle, square, triangle, circle by using the switch case statement is explained below −

Formulae

The formulae for finding the areas of the respective geometrical figures are as follows −

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• Area of rectangle = breadth *length;
• Area of square = side * side;
• Area of circle = 3.142*radius*radius;
• Area of triangle = 0.5 *base*height;

Example

Following is the C program to find the areas of rectangle, square, triangle, circle by using the switch case statement −

 Live Demo

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

输出

当上述程序被执行时，它产生以下结果 −

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