arrays of random integers & time

**meeloff** · 12-07-2004

I have two questions out there for those who can respond.

1. How do I create a large array full of random integers?

2. How do I call the time so I can use it for checking the speed of a function?

I would appreciate any and all input.

meeloff

**prog-bman** · 12-07-2004

1: Create a large array, use a loop and rand().

2. Make 2 time variables call time() on one in the begining of the function call the other at the end of the function call difftime on them and store that to a variable
for time read this http://www.cppreference.com/stddate_...s.html#asctime

**meeloff** · 12-07-2004

Something like this:

Code:

#include <cstdlib>
#include <iostream>

void main()
{
       int i;
       int size = 50;
       int array[size];

       srand( (unsigned) time ( NULL ) );
       
       for(i = 0; i < size; i++)
       {
               array[i] = rand();
        }

}

I found this on MSDN.

**hk_mp5kpdw** · 12-07-2004

Code:

#include <cstdlib>
#include <ctime>
#include <iostream>

int main()
{
       int i;
       const int size = 50;
       int array[size];

       srand( (unsigned) time ( NULL ) );
       
       for(i = 0; i < size; i++)
       {
               array[i] = rand();
        }

}

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