Question

How to generate random alphanumeric string in C++

Answer 1

#include <iostream>
#include <ctime>

std::string generate_random_alphanumeric(const int len) {
    static const char alphanumeric[] =
        "0123456789"
        "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
        "abcdefghijklmnopqrstuvwxyz";
    
    srand(time(NULL));

    std::string s;
    s.reserve(len);

    for (int i = 0; i < len; ++i) 
        s += alphanumeric[rand() % (sizeof(alphanumeric) - 1)];
    
    return s;
    
}

int main() {
    std::cout << generate_random_alphanumeric(10);
}




/*
run:

kRad82PwQd

*/

 

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