Program to find the percentage of difference between two numbers

Given two numbers a and b, where 'b' is incremented or decremented by some percentage of 'a'. The task is to find out that percentage.

Examples: 

Input: a = 20, b = 25
Output: 25% 
Difference between 20 and 25 is 5, 
which is 25 % of 20.
(+ve sign indicate increment)

Input: a = 25, b = 20
Output: -20% 
( -ve sign indicate decrement)

Formula to calculate percentage: 

(Percentage2 - Percentage1) * 100 / (Percentage1) 
  

// C++ program to calculate the percentage
#include <iostream>
using namespace std;

// Function to calculate the percentage
int percent(int a, int b)
{
    float result = 0;
    result = ((b - a) * 100) / a;

    return result;
}

// Driver Code.
int main()
{
    int a = 20, b = 25;

    cout << percent(a, b) << "%";

    return 0;
}

// Java program to calculate
// the percentage
class GFG
{
    
// Function to calculate the percentage
static int percent(int a, int b)
{
    float result = 0;
    result = ((b - a) * 100) / a;

    return (int)result;
}

// Driver Code
public static void main(String[] args)
{
    int a = 20, b = 25;

    System.out.println(percent(a, b) + "%");
}
}

// This code is contributed by mits

# Python 3 program to calculate 
# the percentage

# Function to calculate the percentage
def percent(a, b) :

    result = int(((b - a) * 100) / a)

    return result

# Driver code
if __name__ == "__main__" :

    a, b = 20, 25

    # Function calling
    print(percent(a, b), "%")
            
# This code is contributed by ANKITRAI1

// C# program to calculate
// the percentage
class GFG
{
    
// Function to calculate the percentage
static int percent(int a, int b)
{
    float result = 0;
    result = ((b - a) * 100) / a;

    return (int)result;
}

// Driver Code
static void Main()
{
    int a = 20, b = 25;

    System.Console.WriteLine(percent(a, b) + "%");
}
}

// This code is contributed by mits

<?php
// PHP program to calculate 
// the percentage

// Function to calculate 
// the percentage
function percent($a, $b)
{
    $result = 0;
    $result = (($b - $a) * 100) / $a;

    return $result;
}

// Driver Code
$a = 20;
$b = 25;

echo percent($a, $b) . "%";

// This code is contributed by mits
?>

<script>

// Javascript program to calculate the percentage

// Function to calculate the percentage
function percent(a, b)
{
    var result = 0;
    result = ((b - a) * 100) / a;

    return result;
}

// Driver Code.
var a = 20, b = 25;

document.write( percent(a, b) + "%");

// This code is contributed by itsok

</script>

25%

Time Complexity: O(1)
Auxiliary Space: O(1)