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Program to calculate Percentile of a student based on rank
• Difficulty Level : Easy
• Last Updated : 01 Apr, 2021

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

` `

## 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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