C++ Program to Find the Area of Shapes using Switch Case

This C++ program computes area of a shape using switch case. The program takes shape as an input and identifies the shape using a switch case. The statements then takes required values as input, computes the area and prints it.

Here is the source code of the C++ program computes area of a shape using switch case. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C++ Program to Find Area of Shapes using Switch Case

```
 */ 
```
```
#include <iostream>
```
```
const float PI = 3.14;
```
```
 
```
```
void calculateArea(std::string shape)
```
```
{
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    /* Comparing first character of shape string */

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    switch (shape[0]) {
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```
    case 'c':
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```
 
```
```
        float r;
```
```
 
```

        std::cout << "\nEnter the radius ";

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        std::cin >> r;
```

        std::cout << "\nArea of Circle : " << PI * r * r

                  << " square units" << std::endl;

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        break;
```
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    case 's':
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```
        float a;
```
```
 
```

        std::cout << "\nEnter the side length ";

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        std::cin >> a;
```

        std::cout << "\nArea of Square : " << a * a

                  << " square units" << std::endl;

```
        break;
```
```
 
```
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    case 'r':
```
```
        float b, h;
```
```
 
```

        std::cout << "\nEnter the breadth ";

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        std::cin >> b;
```

        std::cout << "\nEnter the height ";

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        std::cin >> h;
```

        std::cout << "\nArea of Rectangle : " << b * h

                  << " square units" << std::endl;

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        break;
```
```
    }
```
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}
```
```
 
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int main()
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```
{
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    std::string s;
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    std::cout << "Enter the shape : ";
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    getline(std::cin, s);
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    calculateArea(s);
```
```
}
```

$ a.out
Enter the shape : rectangle
Enter the breadth 20
Enter the height 40
Area of Rectangle : 800 square units
C:\MinGW\bin>a.exe
Enter the shape : circle
Enter the radius 10
Area of Circle : 314 square units

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