# Value of Pi(Π) up to 50 decimal places

Given a number N(where N <= 50), the task is to find the value of Pi (Π) up to N decimals places.

Examples

Input: N = 2
Output: 3.14

Input: N = 10
Output: 3.1415926536

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

Approach:

1. The value of Π is calculated using acos() function which returns a numeric value between [-Π, Π].
2. Since using acos(0.0) will return the value for 2*Π. Therefore to get the value of Π:
```double pi = 2*acos(0.0);
```
3. Now the value obtained from above equation is estimated to N decimal digit as:
```printf("%.*lf\n", N, pi);
```

Below is the implementation of the above approach:

## C++

 `// C++ program to calculate the ` `// value of pi up to n decimal ` `// places ` `#include "bits/stdc++.h" ` `using` `namespace` `std; ` ` `  `// Function that prints the ` `// value of pi upto N ` `// decimal places ` `void` `printValueOfPi(``int` `N) ` `{ ` ` `  `    ``// Find value of pi upto ` `    ``// using acos() function ` `    ``double` `pi = 2 * ``acos``(0.0); ` ` `  `    ``// Print value of pi upto ` `    ``// N decimal places ` `    ``printf``(``"%.*lf\n"``, N, pi); ` `} ` ` `  `// Driver Code ` `int` `main() ` `{ ` `    ``int` `N = 4; ` ` `  `    ``// Function that prints ` `    ``// the value of pi ` `    ``printValueOfPi(N); ` `    ``return` `0; ` `} `

## Java

 `// Java program to calculate the ` `// value of pi up to n decimal places ` `class` `GFG { ` `     `  `    ``// Function that prints the ` `    ``// value of pi upto N ` `    ``// decimal places ` `    ``static` `void` `printValueOfPi(``int` `N) ` `    ``{ ` `     `  `        ``// Find value of pi upto ` `        ``// using acos() function ` `        ``double` `pi = ``2` `* Math.acos(``0.0``); ` `     `  `        ``// Print value of pi upto ` `        ``// N decimal places ` `        ``System.out.println(pi); ` `    ``} ` `     `  `    ``// Driver Code ` `    ``public` `static` `void` `main (String[] args) ` `    ``{ ` `        ``int` `N = ``4``; ` `     `  `        ``// Function that prints ` `        ``// the value of pi ` `        ``printValueOfPi(N); ` `    ``} ` `} ` ` `  `// This code is contributed by AnkitRai01 `

## Python3

 `# Python3 program to calculate the  ` `# value of pi up to n decimal places  ` `from` `math ``import` `acos ` ` `  `# Function that prints the  ` `# value of pi upto N  ` `# decimal places  ` `def` `printValueOfPi(N) :  ` ` `  `    ``# Find value of pi upto  ` `    ``# using acos() function  ` `    ``pi ``=` `round``(``2` `*` `acos(``0.0``), N);  ` `     `  `    ``# Print value of pi upto  ` `    ``# N decimal places  ` `    ``print``(pi);  ` ` `  `# Driver Code  ` `if` `__name__ ``=``=` `"__main__"` `:  ` ` `  `    ``N ``=` `4``;  ` ` `  `    ``# Function that prints  ` `    ``# the value of pi  ` `    ``printValueOfPi(N);  ` `     `  `# This code is contributed by AnkitRai01 `

## C#

 `// C# program to calculate the ` `// value of pi up to n decimal places ` `using` `System; ` ` `  `class` `GFG { ` `     `  `    ``// Function that prints the ` `    ``// value of pi upto N ` `    ``// decimal places ` `    ``static` `void` `printValueOfPi(``int` `N) ` `    ``{ ` `     `  `        ``// Find value of pi upto ` `        ``// using acos() function ` `        ``double` `pi = 2 * Math.Acos(0.0); ` `     `  `        ``// Print value of pi upto ` `        ``// N decimal places ` `        ``Console.WriteLine(pi); ` `    ``} ` `     `  `    ``// Driver Code ` `    ``public` `static` `void` `Main() ` `    ``{ ` `        ``int` `N = 4; ` `     `  `        ``// Function that prints ` `        ``// the value of pi ` `        ``printValueOfPi(N); ` `    ``} ` `} ` ` `  `// This code is contributed by AnkitRai01 `

Output:

```3.1416
```

Time Complexity: O(1)

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