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# Creating two dimensional arrays

Posted on 2003-11-02
Medium Priority
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How would one go about creating a two dimensional array like this:
int randomeaten[300][7];
Basically I need 300  7 element arrays of numbers ranging from 2 to 10.
I suppose like this:

randomeaten[i][j] = (rand()%(11-2)+2), (rand()%(11-2)+2), (rand()%(11-2)+2), (rand()%(11-2)+2), (rand()%(11-2)+2), (rand()%(11-2)+2), (rand()%(11-2)+2);

But I'm having troubles making the for statement to create said two dimensional array.
Also, any suggestions on how I can print the array out as well would be greatly appreciated.
0
Question by:Tabris42
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LVL 6

Accepted Solution

Ajar earned 1000 total points
ID: 9668858
Tabris ,

You can not allocate multible elements in a single go as you are doing .

Try to understand this sample code

=================================
#include <stdio.h>
int main(int argc,char * argv[])
{
int randomeaten[300][7],i,j;
//ASSIGNING
for( i = 0; i < 300;i++) for(j = 0; j < 7;j++) randomeaten[i][j]=rand()%(11-2)+2);
//Printing
for( i = 0; i < 300;i++) for(j = 0; j < 7;j++) printf("randomeaten[%d][%d] = %d\n",i,j,randomeaten[i][j]);
}
======================================
0

LVL 10

Expert Comment

ID: 9668928
What is your question about - allocating a two dimensional array OR assigning values in a two dimensional array

You can do it in 2 ways

Statically
int a[300][7] ;

Dynamicaaly
int **a ;
int i ;
a = ( int ** ) malloc ( sizeof ( int * ) * 300 ) ;
for ( i = 0 ; i < 300 ; i++ ) {
a [i] = ( int * ) malloc ( sizeof ( int ) * 7 ) ;
}

The Dynamic approach would be better if the array dimensions are to be decided at run time. May be an input from the user

Regarding Assigning values into it
You would have to assign the value to each array location one at a time
Here's the code for it.
int i, j ;
for ( i = 0 ; i < 300 ; i ++ ) {
for ( j = 0 l j < 7 ; j ++ ) {
a[i][j] = ( rand ()  % ( 11 - 2 ) + 2 ) ;
}
}

Printing
for ( i = 0 ; i < 300 ; i ++ ) {
for ( j = 0 l j < 7 ; j ++ ) {
printf ( "\na[%d][%d]  =  %d " i, j, a[i][j] ) ;
}
}

0

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