C Program to Convert Binary to Hexadecimal

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

// Function to convert binary to hexadecimal
void binaryToHexadecimal(char binary[])
{
    // Length of the binary number
    int length = strlen(binary);
    
    // Calculating the number of digits required in hexadecimal
    int hexLength = (length + 3) / 4;
    
    // Padding the binary number with leading zeros if necessary
    int paddingZeros = hexLength * 4 - length;
    for (int i = 0; i < paddingZeros; i++)
    {
        printf("0");
    }
    
    // Converting each group of 4 binary digits to hexadecimal
    for (int i = 0; i < length; i += 4)
    {
        int decimal = 0;
        
        // Converting binary to decimal
        for (int j = 0; j < 4; j++)
        {
            decimal = decimal * 2 + (binary[i + j] - '0');
        }
        
        // Converting decimal to hexadecimal
        if (decimal < 10)
        {
            printf("%c", decimal + '0');
        }
        else
        {
            printf("%c", decimal - 10 + 'A');
        }
    }
    
    printf("\n");
}

int main()
{
    char binary[100];
    
    printf("Binary to Hexadecimal Converter\n");
    printf("-------------------------------\n");
    printf("Enter a binary number: ");
    scanf("%s", binary);
    
    printf("Hexadecimal equivalent: ");
    binaryToHexadecimal(binary);
    
    return 0;
}