Random and randomize

Question

How does random and randomize work in c++?

Answer 1

To generate a random number we use the rand() function. This will produce a result in the range 0 to RAND_MAX, where RAND_MAX is a constant defined by the implementation.
These are not standard C or C++ functions. In standard C and C++ there are srand and rand which are part of the <stdlib.h> header.

These functions are probably part of Turbo C++ to improve compatibility with Turbo Pascal, where randomize and random are the default random number generator.

As you can't generate a truly random integer with the rand() function alone you have to seed it by including the time library:

#include <time.h>

including the c standard library:

#include <cstdlib>

and then the number generator:

srand(time(NULL));
int random = rand() % 100 + 1;