CODEWITHSUNDEEP
carraysrandom
Worice
Worice

Reputation: 4037

Randomize function

I am trying to create a 1000 elements array. Each element should range between 0 and 99. I first tried by reproduce this didactic example that, actually, I cannot comprehend correctly:

#include <stdio.h>
#include <stdlib.h>
#define DIM 1000

int myVect[DIM];
int i;
int main(){
randomize();                       /∗ Initialize randomize*/
    for (i =0; i < DIM ; i ++)
        myVect[i] = random(100);
return 0;
}

While compiling, I got error, warning and note. 

warning: implicit declaration of function ‘randomize’    (1)
error: too many arguments to function ‘random’           (2)
/usr/include/stdlib.h:282:17: note: declared here        (3)

I found resources from two posts:

Unfortunately, because of my inexperience, I am not capable of get the meaning of the didactic example I posted.

(1) In which library is randomize? I have not been able to find out.

(2) Random should not have a parameter. Hence, why in the example it comes with 100, as it should determine the range of the random numbers?

(3) Does this note indicate where random is declared?

Thank you for your patience.

Upvotes: 1

Views: 436

Answers (1)

haccks
haccks

Reputation: 106012

randomize() and random() are not Standard C library functions. You can use srand and rand instead.

srand((unsigned)time(NULL));                       
for (i =0; i < DIM ; i ++)
    myVect[i] = rand()%100;

For time() function you need to include <time.h> header.

Upvotes: 6

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