This C program converts a decimal number into its hexadecimal representation.

Hexadecimal (or hex) is a base-16 numbering system that uses 16 unique digits to represent values from 0 to 15. The digits 0-9 represent their decimal counterparts, and the letters A-F (or a-f) represent the values 10-15.

## Problem Statement

Write a C program that converts a decimal number to its hexadecimal representation.

The program should perform the following steps:

- Prompt the user to enter a decimal number.
- Read the decimal number input from the user.
- Implement a function,
`decimalToHexadecimal`

, which takes the decimal number as input and converts it to its hexadecimal equivalent. - Within the
`decimalToHexadecimal`

function, perform the conversion by repeatedly dividing the decimal number by 16 and obtaining the remainder. Map each remainder to its corresponding hexadecimal digit. - Store the hexadecimal digits in an array.
- Print the resulting hexadecimal representation by iterating through the array in reverse order.
- Finally, in the
`main`

function, call the`decimalToHexadecimal`

function with the user-provided decimal number and display the hexadecimal representation.

**Note:**

- The program should handle decimal numbers within the range of integers supported by the C language.
- The program should handle the conversion for positive decimal numbers only.

You can use the provided C program template in the previous response as a starting point to solve the problem.

## C program to Convert Decimal to Hexadecimal

#include <stdio.h> void decimalToHexadecimal(int decimalNumber) { int quotient, remainder; char hexadecimalNumber[100]; int i = 0; quotient = decimalNumber; while (quotient != 0) { remainder = quotient % 16; if (remainder < 10) hexadecimalNumber[i++] = remainder + 48; else hexadecimalNumber[i++] = remainder + 55; quotient = quotient / 16; } printf("Hexadecimal representation: "); for (int j = i - 1; j >= 0; j--) printf("%c", hexadecimalNumber[j]); printf("\n"); } int main() { int decimalNumber; printf("Enter a decimal number: "); scanf("%d", &decimalNumber); decimalToHexadecimal(decimalNumber); return 0; }

## How it Works

- The program begins by including the necessary header file,
`<stdio.h>`

, to enable input and output operations. - The
`decimalToHexadecimal`

function is defined to convert the decimal number to its hexadecimal representation. It takes an integer parameter,`decimalNumber`

, which is the decimal value to be converted. - Inside the
`decimalToHexadecimal`

function:- Variables are declared:
`quotient`

to store the quotient obtained during the division process.`remainder`

to store the remainder obtained during each division.`hexadecimalNumber`

as an array of characters to store the hexadecimal digits of the converted number.`i`

as an index variable to keep track of the position of each digit in the`hexadecimalNumber`

array.

- The
`quotient`

is initially set to the`decimalNumber`

. - A loop is used to perform the conversion process:
- In each iteration, the
`remainder`

is calculated as the remainder when the`quotient`

is divided by 16. This step is performed using the modulus operator`%`

. - If the
`remainder`

is less than 10, it represents a digit between 0 and 9. In this case, the ASCII value of the digit is calculated by adding 48 to the`remainder`

. The resulting character is stored in the`hexadecimalNumber`

array at index`i`

. - If the
`remainder`

is greater than or equal to 10, it represents a digit between A and F. In this case, the ASCII value of the digit is calculated by adding 55 to the`remainder`

(to account for the ASCII values of A, B, C, D, E, and F). The resulting character is stored in the`hexadecimalNumber`

array at index`i`

. - The
`quotient`

is updated by dividing it by 16 to move on to the next iteration. - The loop continues until the
`quotient`

becomes 0, indicating that the conversion is complete.

- In each iteration, the
- After the loop, the resulting hexadecimal representation is printed by iterating through the
`hexadecimalNumber`

array in reverse order. This is done by starting the loop from`i-1`

and decrementing`j`

until it becomes 0. The hexadecimal digits are printed as characters using the`printf`

function.

- Variables are declared:
- In the
`main`

function:- An integer variable
`decimalNumber`

is declared to store the decimal number entered by the user. - The user is prompted to enter a decimal number using the
`printf`

function. - The decimal number is read from the user using the
`scanf`

function and stored in the`decimalNumber`

variable. - The
`decimalToHexadecimal`

function is called with the`decimalNumber`

as an argument to perform the conversion and display the hexadecimal representation.

- An integer variable

By following these steps, the program takes a decimal number as input, converts it to its hexadecimal representation using the `decimalToHexadecimal`

function, and displays the result to the user.

## Input /Output

In this example, the program prompts the user to enter a decimal number. The user enters the number `172`

.

The program then converts the decimal number `172`

to its hexadecimal representation using the `decimalToHexadecimal`

function. The resulting hexadecimal representation is `AC`

.

Finally, the program displays the hexadecimal representation to the user as `AC`

.

You can run the program and try different decimal numbers to see their corresponding hexadecimal representations.