**Problem Statement:** Given the radius of the circle, **calculate the area of the circle**.

**Examples:**

Example 1:Input:N = 5Output:78.5Explanation:Using formula πr2 for finding area of circle we get area as 78.5Example 2:Input:N = 4Output: 50.2Explanation:Using formula πr2 for finding area of circle we get area as 50.2

**Solution**

** Disclaimer**:

*Don’t jump directly to the solution, try it out yourself first.*

**Approach**:

- We know that the area of the circle is
**π***r*^{2}. - So taking a variable double to store decimal digits as our ans.
- And multiplying pi with the square of the radius gives us the area of the circle.

**Code:**

## C++ Code

```
#include <bits/stdc++.h>
using namespace std;
class Area {
public:
void areaOfCircle(int n) {
double ans = 3.14 * n * n; // Area of circle = πr2
cout << "Area of circle is : ";
cout << ans;
}
};
int main() {
int n = 5;
Area p1;
p1.areaOfCircle(n);
return 0;
}
```

**Output:**

Area of circle is: 78.5

**Time Complexity: O(1)**

**Space Complexity: O(1)**

## Java Code

```
class Solution {
public static void areaOfCircle(int n) {
double ans = 3.14 * n * n; // Area of circle = πr2
System.out.print("Area of circle is : " + ans);
}
public static void main(String args[]) {
int n = 5;
areaOfCircle(n);
}
}
```

**Output:**

Area of circle is: 78.5

**Time Complexity: O(1)**

**Space Complexity: O(1)**

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