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Program to Convert Hexadecimal to Decimal

Program to Convert Hexadecimal to Decimal

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  • Write a program to Convert Hexadecimal to Decimal in C
  • Write a program to Convert Hexadecimal to Decimal in C++
  • Write a program to Convert Hexadecimal to Decimal in Python
  • Write a program to Convert Hexadecimal to Decimal in PHP
  • Write a program to Convert Hexadecimal to Decimal in Java
  • Write a program to Convert Hexadecimal to Decimal in Java Script
  • Write a program to Convert Hexadecimal to Decimal in C#

Explanation:

Understand the Hexadecimal System:

  • The hexadecimal system is base-16, with digits 0-9 representing values 0-9 and letters A-F representing values 10-15.

Use Positional Weighting:

  • Each digit in the hexadecimal number represents a power of 16 based on its position (rightmost position is 160, next is 161, and so on).
  • Multiply each digit’s value by 16n, where n is the position index (starting from 0 for the rightmost digit).

Sum the Results:

  • Add up all the weighted values to get the decimal equivalent.

Example Conversion:

Hexadecimal: 2F

  1. Expand using powers of 16:
    • 2⋅161 = 2⋅16 = 32
    • F⋅160 = 15⋅1 = 15
  2. Add the results:
    • 32 + 15 = 47

Decimal Result: 47

Program to Convert Hexadecimal to Decimal

#include <stdio.h>
#include <string.h>
#include <math.h>

int hexToDecimal(char hex[]) {
    int decimal = 0, base = 1;
    for (int i = strlen(hex) - 1; i >= 0; i--) {
        if (hex[i] >= '0' && hex[i] <= '9') {
            decimal += (hex[i] - '0') * base;
        } else if (hex[i] >= 'A' && hex[i] <= 'F') {
            decimal += (hex[i] - 'A' + 10) * base;
        } else if (hex[i] >= 'a' && hex[i] <= 'f') {
            decimal += (hex[i] - 'a' + 10) * base;
        }
        base *= 16;
    }
    return decimal;
}

int main() {
    char hex[100];
    printf("Enter a hexadecimal number: ");
    scanf("%s", hex);
    printf("Decimal: %d\n", hexToDecimal(hex));
    return 0;
}


#include <iostream>
#include <string>
using namespace std;

int hexToDecimal(string hex) {
    int decimal = 0, base = 1;
    for (int i = hex.length() - 1; i >= 0; i--) {
        if (hex[i] >= '0' && hex[i] <= '9') {
            decimal += (hex[i] - '0') * base;
        } else if (hex[i] >= 'A' && hex[i] <= 'F') {
            decimal += (hex[i] - 'A' + 10) * base;
        } else if (hex[i] >= 'a' && hex[i] <= 'f') {
            decimal += (hex[i] - 'a' + 10) * base;
        }
        base *= 16;
    }
    return decimal;
}

int main() {
    string hex;
    cout << "Enter a hexadecimal number: ";
    cin >> hex;
    cout << "Decimal: " << hexToDecimal(hex) << endl;
    return 0;
}


def hex_to_decimal(hexadecimal):
    return int(hexadecimal, 16)

hexadecimal = input("Enter a hexadecimal number: ")
print("Decimal:", hex_to_decimal(hexadecimal))


<?php
function hexToDecimal($hex) {
    return hexdec($hex);
}

$hex = readline("Enter a hexadecimal number: ");
echo "Decimal: " . hexToDecimal($hex) . "\n";
?>


import java.util.Scanner;

public class HexadecimalToDecimal {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a hexadecimal number: ");
        String hex = sc.nextLine();
        int decimal = Integer.parseInt(hex, 16);
        System.out.println("Decimal: " + decimal);
    }
}


function hexToDecimal(hex) {
    return parseInt(hex, 16);
}

const hex = prompt("Enter a hexadecimal number: ");
console.log("Decimal:", hexToDecimal(hex));


using System;

class HexadecimalToDecimal {
    static void Main() {
        Console.Write("Enter a hexadecimal number: ");
        string hex = Console.ReadLine();
        int decimalValue = Convert.ToInt32(hex, 16);
        Console.WriteLine("Decimal: " + decimalValue);
    }
}

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