How to write djb2 hashing function in C?

Question

I am not able to figure out how to write the djb3 hashing function on C.

I searched the internet but I found it may be in C++...

unsigned long hash(unsigned char *str){
        unsigned long hash = 5381;
        int c;

        while (c = *str++)
            hash = ((hash << 5) + hash) + c; /* hash * 33 + c */

        return hash;
    }

and if you can explain this to me I will be really thankful...

Answer 1

Here is the code for djb2 Hashing function in C programming language!

unsigned int hash(const char *word)
{
    unsigned int hash = 5381;
    int c;

    while ((c = *word++))        // *str++ is going to the next address in memory, where the next char in the string is stored
    {
        if (isupper(c))
        {
            c = c + 32;
        }

        hash = ((hash << 5) + hash) + c; // hash * 33 + c   // hash << 5 = hash * 2^5
    }

    return hash % N;
}

Thanks to @500-InternalServerError for solving my doubts.