Allocating in memory piece which later will be used as array using C programming language

another_pointer_example.c

//STUDYING MATERIAL
#include <stdio.h>

int main()
{
    const int WIDTH=100;
    const int HEIGHT=100;
    int a[HEIGHT][WIDTH];
    
    int i;
    for(i=0;i<HEIGHT;i++){
        int j;
        for(j=0;j<WIDTH;j++){
            a[i][j] = i*WIDTH+j;
        }
    }
    
    int* ptr = &a;
    for(i=0;i<HEIGHT;i++){
        int j;
        for(j=0;j<WIDTH;j++){
            printf("%d:%d\t\t%d\n",i,j,*ptr);
            ptr++;
        }
    }
    
    return 0;
}

array.c

//STUDYING MATERIAL
#include <stdio.h>

int main()
{
    //something like user inputing dimensions
    int width = 1000;
    int height = 1000;
    
    //allocating memory for array
    int* array = malloc(width*height*sizeof(int));
    int i;
    //moving ptr to the begining of array
    int* ptr=array;
    for(i=0;i<height;i++){
        //row by row
        int j=0;
        for(j;j<width;j++){
            //col by col
            //writing value at current position
            *ptr = i*width+j;
            //moving pointer 4 bytes forward
            ptr++;
        }
    }
    
    ptr = array;
    for(i=0;i<height;i++){
        //row by row
        int j;
        for(j=0;j<width;j++){
            //col by col
            int a = *ptr;
            ptr++;
            printf("%d:%d - %d\n",i,j,a);
        }
        printf("\n");
    }
    free(array);
    return 0;
}