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  1. #include <stdio.h> 
  2.  
  3. int main() { 
  4.     int choice; 
  5.     double radius, length, width, side, base, height, area;
  6.  
  7.     printf("--- Area Calculator ---\n");
  8.     printf("1. Circle\n2. Rectangle\n3. Square\n4. Triangle\n"); 
  9.     printf("Enter your choice (1-4): "); 
  10.     scanf("%d", &choice);
  11.  
  12.     switch (choice) {
  13.         case 1:
  14.             printf("Enter radius: ");
  15.             scanf("%lf", &radius);       
  16.             area = 3.14159 * radius * radius;
  17.             printf("Area of Circle = %.2f\n", area);
  18.             break;
  19.         case 2: 
  20.             printf("Enter length and width: "); 
  21.             scanf("%lf %lf", &length, &width);  
  22.             area = length * width; 
  23.             printf("Area of Rectangle = %.2f\n", area); 
  24.             break;
  25.  
  26.         case 3: 
  27.             printf("Enter side length: "); 
  28.             scanf("%lf", &side);           
  29.             area = side * side;
  30.             printf("Area of Square = %.2f\n", area);
  31.             break;
  32.  
  33.         case 4:
  34.             printf("Enter base and height: "); 
  35.             scanf("%lf %lf", &base, &height);   
  36.             area =  0.5 * base * height;
  37.             printf("Area of Triangle = %.2f\n", area);
  38.             break;
  39.         default: 
  40.             printf("Invalid choice!\n");
  41.         }
  42.     return 0;
  43. }
  44.  
Success #stdin #stdout 0s 5304KB
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triangle
stdout
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--- Area Calculator ---
1. Circle
2. Rectangle
3. Square
4. Triangle
Enter your choice (1-4): Invalid choice!
https://ideone.com/4TrEOm
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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