Program to convert Hexadecimal to Decimal

Problem statement:-  Program to convert Hexadecimal to Decimal.

 Data requirement:-

   Input Data:- sizea, hex

  Output Data:- decimal

  Additional Data:-i, j, value

Program in C

Here is the source code of the C program to convert Hexadecimal number to Decimal number.

Code:

//Hexadecimal to Decimal
#include<stdio.h>
#include<string.h>
#include<math.h>
int main ()
{
  int sizea,i;
  printf ("Enter the array size:");
  scanf ("%d", &sizea);
  char hex[sizea+1];
 printf("Enter Hexadecimal Number:");
  for (i = 0; i < sizea+1; i++)
    {
      scanf ("%c", &hex[i]);
    }

  int value=0;
  int decimal=0;
  int j=strlen(hex);
  j--;
  for(i=0;hex[i]!='\0';i++)
    {
      switch (hex[i])
{
case '0':
  value=0;
  break;
case '1':
  value=1;
  break;
case '2':
  value=2;
  break;
case '3':
  value=3;
  break;
case '4':
  value=4;
  break;
case '5':
  value=5;
  break;
case '6':
  value=6;
  break;
case '7':
  value=7;
  break;
case '8':
value=8;
  break;
case '9':
  value=9;
  break;
case 'A':
    case 'a':
  value=10;
  break;
case 'B':
    case 'b':
  value=11;
  break;
case 'C':
    case 'c':
  value=12;
  break;
case 'D':
    case 'd':
  value=13;
    break;
case 'E':
    case 'e':
  value=14;
    break;
case 'F':
    case 'f':
  value=15;
    break;
}
      decimal+=value*pow(16,j);
      j--;
    }
    printf("Decimal Number is: %d",decimal);
}

Input/Output:

Enter the array size:2
Enter Hexadecimal Number:EE
Decimal Number is: 238

Program in C++

Here is the source code of the C++ program to convert Hexadecimal to a decimal using a while loop.

Code:

//Hexadecimal to Decimal
#include<iostream>
#include<string>
#include<cmath>
using namespace std;
int main ()
{
  int sizea,i;
  cout<<"Enter the array size:";
  cin>>sizea;
  char hex[sizea];
 cout<<"Enter Hexadecimal Number:";
  for (i = 0; i < sizea; i++)
    {
      cin>>hex[i];
    }

  int value=0;
  int decimal=0;
  int j=sizea;
  j--;
  for(i=0;hex[i]!='\0';i++)
    {
      switch (hex[i])
{
case '0':
  value=0;
  break;
case '1':
  value=1;
  break;
case '2':
  value=2;
  break;
case '3':
  value=3;
  break;
case '4':
  value=4;
  break;
case '5':
  value=5;
  break;
case '6':
  value=6;
  break;
case '7':
  value=7;
  break;
case '8':
value=8;
  break;
case '9':
  value=9;
  break;
case 'A':
    case 'a':
  value=10;
  break;
case 'B':
    case 'b':
  value=11;
  break;
case 'C':
    case 'c':
  value=12;
  break;
case 'D':
    case 'd':
  value=13;
    break;
case 'E':
    case 'e':
  value=14;
    break;
case 'F':
    case 'f':
  value=15;
    break;
}
      decimal+=value*pow(16,j);
      j--;
    }
    cout<<"Decimal Number is: "<<decimal;
}

Input/Output:

Enter the array size:2
Enter Hexadecimal Number:9f
Octal Number is: 237

Program in Java

  

Here is the source code of the Java program to convert a hexadecimal number to a decimal number.

Code:

import java.util.Scanner;
public class HexadecimalToDecimal {

public static void main(String[] args) {
Scanner cs=new Scanner(System.in);
  int i;
  String hex;
  System.out.println("Enter Hexadecimal Number:");
  hex=cs.nextLine();
  int value=0;
  int decimal=0;
  int j=hex.length();
  j--;
  for(i=0;i<hex.length();i++)
    {
      switch (hex.charAt(i))
{
case '0':
  value=0;
  break;
case '1':
  value=1;
  break;
case '2':
  value=2;
  break;
case '3':
  value=3;
  break;
case '4':
  value=4;
  break;
case '5':
  value=5;
  break;
case '6':
  value=6;
  break;
case '7':
  value=7;
  break;
case '8':
value=8;
  break;
case '9':
  value=9;
  break;
case 'A':
    case 'a':
  value=10;
  break;
case 'B':
    case 'b':
  value=11;
  break;
case 'C':
    case 'c':
  value=12;
  break;
case 'D':
    case 'd':
  value=13;
    break;
case 'E':
    case 'e':
  value=14;
    break;
case 'F':
    case 'f':
  value=15;
    break;
}
      decimal+=value*Math.pow(16,j);
      j--;
    }
    System.out.println("Decimal Number is: "+decimal);
cs.close();
}
}

Input/Output:

Enter Hexadecimal Number:
EFA
Decimal Number is: 3834

Program in Python
  

Here is the source code of the Python Program program to convert hexadecimal to decimal without function.

Code:

import math
hex=input("Enter Hexadecimal Number:")
value=0
decimal=0
j=len(hex)
j-=1
for i in range(0,len(hex)):
    if hex[i]>='0' and hex[i]<='9' :
        value=(int)(hex[i])
    if hex[i]=='A' or hex[i]=='a':
        value=10
    if hex[i] == 'B' or hex[i] == 'b':
        value=11
    if hex[i] == 'C' or hex[i] == 'c':
        value=12
    if hex[i] == 'D' or hex[i] == 'd':
        value=13
    if hex[i] == 'E' or hex[i] == 'e':
        value=14
    if hex[i] == 'F' or hex[i] == 'f':
        value=15
    decimal=decimal+(int)(value*math.pow(16,j))
    j-=1
print("Decimal Number is:",decimal)

Input/Output:

Enter Hexadecimal Number:4BC
Decimal Number is: 1212

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