calloc error

Dear people that know more C than me (ie Everyone)

I am working on a simple bit of C code to fill a dynamic array with specific values and display them in a grid. However, I'm getting stuck at the beginning, when I try to allocate memory for the array. I have checked around for other calloc code, and I'm not sure where I'm making my mistake. When I try to compile my code, I receive an error that says: "incompatible implicit declaration of built-in function 'calloc'"

The code I'm using is as follows:

Code:

#include<stdio.h>
#include<math.h>

main()  {
        int i, j;

        //values to hold row & col size for array & mem size needed
        int col, row, Doubles;

        printf("\nEnter the number of columns desired for your array \n");
        scanf("%d", &col);

        printf("\nEnter the number of rows desired for your array \n");
        scanf("%d", &row);

        Doubles = col * row;

        //declaring the array
       //THIS IS WHERE I'M GETTING THE ERROR
        double *ArrayPtr = (double *) calloc (Doubles,sizeof(double));

        //filling the array with the requested values
        for(i = 0; i < row; i++)
                for(j = 0; j < col; j++)        {
                        *ArrayPtr = i * 100 + col;
                        ArrayPtr ++;
                }

Please let me know if you what I'm doing wrong in my calloc statement. Thank you in advance!

calloc() is declared in stdlib.h. You'll need to add the following line near the top of the file:
#include<stdlib.h>

That's why I put "beginner" as one of the tags! Thanks itsme - that fixed it!