How to create a two dimensinal array of random integers?

[timbean]

Hello, My program is to generate a two dimensional array of random integers between 0 and 40, each row of this array is X, Y, and Z of a plane. I dont have a clue how to go about this program. This is what i have so far. Can someone let me know if i'm doing this correctly? If not, how should I go about doing it?

 
double array[][][5]; 

int main(void)
{
  double x,y,z;
  double array[2][4][5]; 
    
    srand(time(NULL));
    for(x=0;x<40;x++)
    {
      for(y=0;y<40;y++)
      {
        for(z=0;z<40;z++)
        {
          amarry[x][y][z] = (x+1)+(y+1)+(z+1);
        }
      }
    }

[quzah]

Are you trying to make the array have a random number of elements for the dimensions, or are you trying to populate the elements with random values? If the latter, there is a FAQ on generating random numbers (hint: you aren't calling rand()).

If the former, then you should search the forum for something like 'dynamic multi dimensional arrays' or something similar.


Quzah.

[timbean]

Thank i will look in the forum. I'm am trying to populate the elements with random values.

[CommonTater]

Hello, My program is to generate a two dimensional array of random integers between 0 and 40, each row of this array is X, Y, and Z of a plane. I dont have a clue how to go about this program. This is what i have so far. Can someone let me know if i'm doing this correctly? If not, how should I go about doing it?

 
#include <time.h>
#include <math.h>
#include <stdlib.h>


double array[][][5];  <-- remove this 

int main(void)
{
  double x,y,z;         <-- counters should be type int 
  double array[2][4][5]; 
    
    srand(time(NULL));
    for(x=0;x<40;x++)  <-- This should be x <2 
    {
      for(y=0;y<40;y++)  <-- this should be y < 4 
      {
        for(z=0;z<40;z++)   <-- this should be z < 5 
        {
          array[x][y][z] =  <--- call rand() here         
        }
      }
    }

When writing C code always be aware of the sizes of your arrays. If you overrun the boundaries bad --undefined-- stuff is very likely to happen.

[timbean]

No luck! I through the forum and nothing and found nothing.

[CommonTater]

scroll up...

[timbean]

Did not work.

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

 double amarry[][][5]; 

int main(void)
{
  double x,y,z;
  double amarry[2][4][5]; 
    
    
    for(x=0;x<40;x++)
    {
      for(y=0;y<40;y++)
      {
        for(z=0;z<40;z++)
        {
          amarry[x][y][z] =rand()%40+1;
        }
      }
    }

[CommonTater]

Now go back and take a look at post #4 in this thread... and follow the advice given.

Your code as it is now has horrific array bounds overruns that will cause it to crash.

[timbean]

thank for your help

[iMalc]

For a 2D array, there are too many dimensions in that 'code'.

It's clear that you still don't know what each line of your program does.