Question

How to hash a string in C

Answer 1

#include <stdio.h>

unsigned long hash(const char *str) {
    //Initializes the hash value with a starting seed of 5381.
    unsigned long hash = 5381;
    int c;

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

    return hash;
}

int main() {
    printf("%lu\n", hash("Hello, World!"));
    
    return 0;
}


/*
run:

5904905660241445518

*/

 

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