/*
* Copyright 2011 Steven Gribble
*
* This file is the solution to an exercise problem posed during
* one of the UW CSE 333 lectures (333exercises).
*
* 333exercises is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 333exercises is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with 333exercises. If not, see .
*/
// Lecture 3 Extra Exercise #3
#include // needed for printf
#include // needed for malloc, free
#include // needed for assert
// Write a function that:
//
// - accepts an (array of ints) and an (array length) as arguments
//
// - malloc’s an (array of (int *)) of the same length
//
// - initializes each element of the newly allocated array to point to
// the corresponding element in the passed-in array
//
// - returns a pointer to the newly allocated array
int **MakePointerArray(int *intarray, int arraylen) {
int **parray;
int i;
// do some sanity checking on the arguments
assert(intarray != NULL);
assert(arraylen > 0);
// malloc the array, make sure we had the memory for it
parray = (int **) malloc(arraylen*sizeof(int *));
assert(parray != NULL);
// initialize the array
for (i = 0; i < arraylen; i++) {
parray[i] = &(intarray[i]);
}
// return the array
return parray;
}
int main(int argc, char **argv) {
int **parray = NULL;
int intarray[2] = {1, 2};
parray = MakePointerArray(intarray, 2);
assert(parray != NULL);
assert(parray[0] == &(intarray[0]));
assert(parray[1] == &(intarray[1]));
free(parray);
return 0;
}