// ******************************************
// * Passing 2D arrays into a function when *
// * the width is not known at compile time *
// ******************************************

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

//After input the program calls this function to clear the buffer
void buff_clr()
{
    char junk;
    do
    {
     junk=getchar();
    }while(junk!='\n');

}

//Just a test function(hence it's name) to test subscripting "by hand"
void func_test(int *array, int columns, int rows)
{
    unsigned int i=0,j=0;
    while(1)
    {
        printf("\nInput the coordinates you would like to change:");
        printf("\nRow:");
        scanf("%d",&i);
        buff_clr();
        printf("Column:");
        scanf("%d",&j);
        buff_clr();
        if(i<rows && j<columns)
        {
            break;
        }
    }
    array[i*columns+j]=125;
}

int main()
{
int n=0,m=0;
unsigned int i=0,j=0;

//Prompts for array size values
printf("Input the matrix size n x m:\n");
printf("Input No. of columns:");
scanf("%d",&n);
buff_clr();
printf("Input No. of rows:");
scanf("%d",&m);
buff_clr();

//2D array definition
int array[m][n];

//seed for rand() function
//which will give the array random values from 0-10
srand((unsigned int)time(NULL));

printf("\n");

//array initialization
for(i=0;i<m;i++)
{
    for(j=0;j<n;j++)
    {
        array[i][j] = rand() % 11;
    }
}

//array print
for(i=0;i<m;i++)
{
    for(j=0;j<n;j++)
    {
        printf("\t%d",array[i][j]);
    }
    printf("\n");
}

//test function call
func_test(&array[0][0],m,n);

printf("\n\n");

//array print
for(i=0;i<m;i++)
{
    for(j=0;j<n;j++)
    {
        printf("\t%d",array[i][j]);
    }
    printf("\n");
}

return 0;
}