Help creating alphanumeric string

Projects Programming
10

You can do something like this

#include <stdlib.h>

static const char alphanumericCharacters[] = {
    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h,', 'i', 'j', 'k', 'l',
    'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
    'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'
};

static void randomString(char *str, unsigned int count) {

    unsigned int i;
    for (i = 0; i < count; i++) {
        str[i] = alphanumericCharacters[rand() % sizeof(alphanumericCharacters)];
    }

    str[i] = '\0';
}

int main() {

    char str[129];
    randomString(str, 128);

    return 0;
}

I don't have an Arduino at hand right now, so this is written in plain C but should be easily adaptable.