This is a function that generates a string of random characters to the length that you specify.
C++ Random Code Generator
#include <iostream>
#include <string>
#include <time.h>
#include <stdlib.h>
using namespace std;
string random(int len)
{
string a = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
string r;
srand(time(NULL));
for(int i = 0; i < len; i++) r.push_back(a.at(size_t(rand() % 62)));
return r;
}
int main()
{
cout << random(32) << endl;
cin.get();
return 0;
}
vijayan121 1,152 Posting Virtuoso
srand(time(NULL));
Not a good idea to reseed the linear congruential rng each time the function is called.
Perhaps something like: static int seed_once = ( std::srand( std::time(0) ), 0 ) ; instead.
Or better still, just document that std::rand() is used; and expect main() to call std::srand().
C++11:
#include <string>
#include <random>
#include <ctime>
std::string random_str( std::size_t len )
{
static const std::string a =
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789" ;
static std::mt19937 rng( std::time(0) ) ;
static std::uniform_int_distribution<std::size_t> distr( 0, a.size() - 1 ) ;
std::string r ;
for( std::size_t i = 0 ; i < len; ++i ) r += a[ distr(rng) ] ;
return r ;
}
Echo89 9 Web Developer
Thanks a lot!
5n0wn1nja 0 Newbie Poster
vijayan ...ur code seems to freeze my computer everytime i try to open it ...y is this?
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