Converting Decimal to Hexadecimal.

#include <stdio.h>

// Function to convert decimal to hexadecimal
void decimalToHexadecimal(int decimalNumber) {
    int remainder;
    char hexadecimal[100];  // Array to store hexadecimal digits
    int index = 0;

    // Loop to process the decimal number
    while (decimalNumber != 0) {
        remainder = decimalNumber % 16;  // Get the remainder of the division by 16

        // Convert remainder to hexadecimal character
        if (remainder < 10)
            hexadecimal[index] = remainder + '0';  // For digits 0-9
        else
            hexadecimal[index] = remainder - 10 + 'A';  // For letters A-F

        decimalNumber /= 16;  // Divide the decimal number by 16 for the next digit
        index++;  // Move to the next position
    }

    // Print the hexadecimal number in reverse order
    printf("Hexadecimal equivalent: ");
    for (int i = index - 1; i >= 0; i--) {
        printf("%c", hexadecimal[i]);
    }
    printf("\n");
}

int main() {
    int decimalNumber;

    // Input a decimal number from the user
    printf("Enter a decimal number: ");
    scanf("%d", &decimalNumber);

    // Check if the input is zero
    if (decimalNumber == 0) {
        printf("Hexadecimal equivalent: 0\n");
    } else {
        // Convert decimal to hexadecimal and display the result
        decimalToHexadecimal(decimalNumber);
    }

    return 0;
}