Error in using typedef - c

Question

I have this code in c-
This is my Room.h file
typedef int Room[10][10];
THis is my main code-
#include"Room.h"
#include<stdio.h>
#include<stdlib.h>
int createRoom(Room * pm,char *filename)
{
FILE * input;FILE * output;
input=fopen(filename,"r");
int a;int i=0,j=0;int count;
fscanf(input,"%d",&a);
while(!feof(input))
{
pm[i][j]=a; // incompatible types when assigning to type ‘int[10]’ from type ‘int’
i++;j++;count++;
fscanf (input, "%d", &a);
}
for(i=0;i<count;i++)
{
for(j=0;j<count;j++)
printf("%d ",pm[i][j]);
printf("\n");
}
fclose(input);
return count;
}
int main()
{
char name[100];
printf("Enter file name\n");
scanf("%s",name);
Room *pm;
//pm=malloc(sizeof(Maze ));
int n=createRoom(pm,name);
return 0;
}
I get this error- incompatible types when assigning to type ‘int[10]’ from type ‘int’ in this line-pm[i][j]=a; .Why is it so?

Answer 1

This line
pm[i][j]=a;
needs to be changed to
(*pm)[i][j]=a;
More importantly, your code does not allocate memory for pm. In main, you have:
Room *pm;
//pm=malloc(sizeof(Maze ));
int n=createRoom(pm,name);
I wonder why you removed the line to allocate memory for pm. You can use:
Room *pm;
pm=malloc(sizeof(*pm));
int n=createRoom(pm,name);
and make sure to deallocate memory.
free(pm);
Or, you could just use:
Room pm;
int n=createRoom(&pm,name);