Code

 Header...
// Allocate a 2-D array of ints
 int * * new2dint(int m,int n){
   ... 

»  int * *p;
»  int i;

»  p=xmalloc(m*sizeof *p);
»  for (i=0; i<m; ++i) 
    pi=malloc(n*sizeof *p[i]);
»  return p;
}

// Free a 2-D array of ints
 void free2dint(int * *p,int m){
   ... 

»  for ( int i=0;i<m; ++i) 
    free(pi);
»  free(p);
}

 int main(){
   ... 

»  int * *p=NULL;
»  int m, n;

»  do{
»    printf("Sizes of array (>0)?\n");
»    scanf("%i %i", &m, &n);
  }while (n<=0||m<=0) ;

»  p=new2dint(m, n);
»  p[0]1=17;
»  p[m-1]0=13;
»  p[m-1](n-1)=10;

»  free2dint(p, m);// To demonstrate

»  return 0;
}