Help with Random...

Can I get a random value from an array?

Example:

Code:

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char vals[5]={'3','350','400','44','2'};

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then make it print out
3, 350, 400, 44, or 2 at random?

use rand()%5 to give you the numbers 0 to 4. Then grab that element from your array.

You can get a random value from an array. What I would do is randomize an Integer from 0 to (whatever index) then just access that array using index X. So like: val[x]; where x will be your randomized variable.

sure,

Code:

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rand() % array_size_-1

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do you know about the rand() function, seeding, and all that stuff. if not check the faq. did that answer your question? :)

Code:

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char test[5]={'2','5','20','38','24'};

srand(time(NULL));
test = rand() % 4;

cout<<test;

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????
If thats not right pls give example

Yes that is a correct method of randomization. However that will not display the index. Here is how I would do it:

#include "time.h"

...
INT x;
srand(time(NULL));
x = rand()%4;
cout<<test[x];

Sweet... thx for the quick help all.

Code:

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  char test[5]={'2','5','20','38','24'};
  int x;

  srand((unsigned)time(NULL));
  x=rand()%5;
  cout<<test[x];

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rand()%4 will return 0-3. If you have 4 items in your array use rand()%5

If I have 5 items in an array, it should be
rand()%4

that will get 0 - 4

0, 1, 2, 3, 4, <--- That is 5 numbers

:confused:

Nope, %4 will give 0,1,2,3. Modulus is the remainder of the fraction.

1/4 = 0 with 1 as the modulus
2/4 = 0 with 2 as the modulus
3/4 = 0 with 3 as the modulus
4/4 = 1 with 0 as the modulus
5/4 = 1 with 1 as the modulus
6/4 = 1 with 2 as the modulus

etc . . .