# Program to calculate Percentile of a student based on rank

Given the rank of a student and the total number of students appearing in an examination, the task is to find the percentile of the student.

The percentile of a student is the % of the number of students having marks less than him/her.

Examples:

Input: Rank: 805, Total Number of Students Appeared: 97481
Output: 99.17
Explanation:
((97481 – 805) / 97481) * 100 = 99.17
Input: Rank: 65, Total Number of Students Appeared: 100
Output: 35
Explanation:
((100 – 65) / 100) * 100 = 35

Approach
The formula to calculate the percentile when the rank of the student and the total number of students appeared is given is:

((Total Students – Rank) / Total Students) * 100

Below is the implementation of the above formula:

C++

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## C++

 `// C++ program to calculate Percentile` `// of a student based on rank`   `#include ` `using` `namespace` `std;`   `// Program to calculate the percentile` `float` `getPercentile(``int` `rank, ``int` `students)` `{` `    ``// flat variable to store the result` `    ``float` `result = ``float``(students - rank)` `                ``/ students * 100;`   `    ``// calculate and return the percentile` `    ``return` `result;` `}`   `// Driver Code` `int` `main()` `{` `    ``int` `your_rank = 805;` `    ``int` `total_students = 97481;`   `    ``cout << getPercentile(` `        ``your_rank, total_students);` `}`

## Java

 `// Java program to calculate Percentile` `// of a student based on rank` `import` `java.util.*;`   `class` `GFG{` ` `  `// Program to calculate the percentile` `static` `float` `getPercentile(``int` `rank, ``int` `students)` `{` `    ``// flat variable to store the result` `    ``float` `result = (``float``)(students - rank)` `                   ``/ students * ``100``;` ` `  `    ``// calculate and return the percentile` `    ``return` `result;` `}` ` `  `// Driver Code` `public` `static` `void` `main(String[] args)` `{` `    ``int` `your_rank = ``805``;` `    ``int` `total_students = ``97481``;` ` `  `    ``System.out.print(getPercentile(` `        ``your_rank, total_students));` `}` `}`   `// This code is contributed by Princi Singh`

## Python3

 `# Python3 program to calculate Percentile ` `# of a student based on rank `   `# Program to calculate the percentile ` `def` `getPercentile(rank, students) : `   `    ``# flat variable to store the result ` `    ``result ``=` `(students ``-` `rank) ``/` `students ``*` `100``; `   `    ``# calculate and return the percentile ` `    ``return` `result; `   `# Driver Code ` `if` `__name__ ``=``=` `"__main__"` `: `   `    ``your_rank ``=` `805``; ` `    ``total_students ``=` `97481``; `   `    ``print``(getPercentile(your_rank, total_students)); `   `# This code is contributed by Yash_R`

## C#

 `// C# program to calculate Percentile` `// of a student based on rank` `using` `System;`   `class` `GFG{` `  `  `// Program to calculate the percentile` `static` `float` `getPercentile(``int` `rank, ``int` `students)` `{` `    ``// flat variable to store the result` `    ``float` `result = (``float``)(students - rank)` `                   ``/ students * 100;` `  `  `    ``// calculate and return the percentile` `    ``return` `result;` `}` `  `  `// Driver Code` `public` `static` `void` `Main(String[] args)` `{` `    ``int` `your_rank = 805;` `    ``int` `total_students = 97481;` `  `  `    ``Console.Write(getPercentile(` `        ``your_rank, total_students));` `}` `}`   `// This code is contributed by Princi Singh`

## Javascript

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Output:

`99.1742`

Performance Analysis

• Time Complexity: In the above approach, we are able to calculate percentile using a formula in constant time, so the time complexity is O(1)

• Auxiliary Space Complexity: In the above approach, we are not using any extra space apart from a few constant size variables, so Auxiliary space complexity is O(1).

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