Thread: do variables die in function

if varianbles are declared within a function, do they die when the function finish?

unless they are static then yes.

If you allocate memory for them with new, then the memory is still valid after the function ends and doesn't die until you delete it.

The memory space will still be avialable until you delete it, however any local pointers you have in the function will be destroyed when the function ends, so unless you are saving the pointer somehow (return value or static) then that memory space is effectivaly lost.

ok, i see how it works. i was just working with random numbers and i came up with another question. lkook at my code:

Code:

 #include <iostream>
#include <conio.h>

using namespace std;

int generate_numbers(int low, int high)
{
    time_t seconds;
    time (&seconds);
    return (rand() % (high - low + 1) + low);
}

int main()
{
    int number[10];
    int i;
    for (i = 0; i < 10; i++)
        number[i] = generate_numbers(1, 100);
    for (i = 0; i < 10; i++)
        cout << number[i] << endl;
    getch();
    return 0;
}

i have a function thats supposed to generate random numbers and reutnr them, but everytime i run the program, i get the same result. why isn't this random?

Ok are you getting different numbers for each call?

The reason you would get the same set of numbers each time you run the program is because you aren't initalizing the random number generator.

Search the board and you'll find about a million posts about it.