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# Java Program to Calculate and Display Area of a Circle

• Difficulty Level : Medium
• Last Updated : 28 Jul, 2022

Given a radius of the circle, write a java program to calculate and display the area of the circle. (Take ∏=3.142)

Example

```Input : radius= 5
Output: Area of circle is : 78.55

Output: Area of circle is : 201.08```

As we know to calculate the area of a circle, the radius of the circle must be known, so if the radius of the circle is known, then the area of the circle can be calculated by using the formula:

Below is the Java Program to calculate the area of the circle:-

## Java

 `// Java program to calculate the area of the` `public` `class` `GFG {` `    ``public` `static` `void` `main(String[] args)` `    ``{` `        ``int` `radius;` `        ``double` `pi = ``3.142``, area;` `        ``radius = ``5``;` `        ``// calculating the area of the circle` `        ``area = pi * radius * radius;` `        ``// printing the area of the circle` `        ``System.out.println(``"Area of circle is :"` `+ area);` `    ``}` `}`

Output

`Area of circle is :78.55`

Time complexity: O(1) since performing constant operations

Auxiliary Space: O(1)

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