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suppose we are to implement speller using an array instead of a hash-table or a trie. … so why not set a maximum size for our array? …

it's generally recommended to minimize your heap usage. another alternative would be creating an array of pointers, perhaps on the stack, and allocating memory for your int arrays on the heap as necessary …

when you declare an array of a certain size, depending on where you declare your array, the memory for it may get allocated on the stack (e.g., if it's declared as a local variable — inside of a function … memory allocated on the stack gets freed automatically as your array (or more generally, local variable) gets out of scope. so you don't have to worry about manually freeing your memory. …

of course needle and haystack both are pointers and thus they both store addresses which are essentially numbers so we can perform arithmetic operations on them. needle - haystack + 2 + 1 subtract …

can say that there is no array parameter type. when you declare the type of a parameter as an array, it actually gets declared to be of the array element's pointer type. … it's often said that arrays decay to pointers. this is actually why when passing an array to a function, only the address of that array is passed. …

input_array is an array of pointers to inputs — input_array[counter] evaluates to an input * not an input. accessing input_value through input_array[counter] using the . operator is not actually the correct …

you have your second for loop nested inside the first one which means that the second for loop is not executed after votecounter[1] to votecounter[4] are initialized to 0, but rather it's executed onc …

Array names decay to pointers (i.e., if you used the name of an array by itself, then you're using a pointer to the whole array which happens to be also a pointer to the first element in the array). … So str here is mainly a pointer to the whole array, but it also could be a pointer to the first element in the array (i.e., the char 'f' in this case). …

allocates a chunk of memory, reads the string that the user enters character by character, stores the current character at the appropriate location and, if at some point there's not enough space left in the array … , it reallocates a new array with ~double the size of the older one, copies the contents of the older array into the newer array, frees the older array and the process repeats. …

First, this is not a 2D array of strings. It's a 2D array of chars and 1D array of strings. …

the first element in the array as well. … for the array. …

A function that takes a 2D-array as an argument may have the following prototype void foo(int arr[][<cols>]); where <cols> is the number of columns in the array to be passed. … The following piece of code passes a 2D-array to foo (declared above) int bar[3][3]; foo(bar); Notice that I'm not passing &bar because that would be a pointer to my 2D-array not my 2D-array itself. …

A hash-table basically maps keys to values (it basically consists of these two parts — the keys part and the values part). If you used a hash-table in pset6, you'd probably know that you had to implem …

You can think of HOUSES as an associative array. It contains key/value pairs. …

In C, there's nothing prevents you from doing such thing as trying to access illegal array indices. … In C, however, if values is an n-element array, then values[-1] starts at sizeof (values[0]) bytes right before the start of values[0]. …