Meaning of *& and **& in C++

That is taking the parameter by reference. So in the first case you are taking a pointer parameter by reference so whatever modification you do to the value of the pointer is reflected outside the function. Second is the simlilar to first one with the only difference being that it is a double pointer. See … Read more

Casting a pointer to an int

I am writing my own functions for malloc and free in C for an assignment. I need to take advantage of the C sbrk() wrapper function. From what I understand sbrk() increments the program’s data space by the number of bytes passed as an argument and points to the location of the program break. If … Read more

Get size of pointer in C

Given an arbitrary type (I’ve chosen char here, but that is for sake of concrete example): You can use either of these expressions: Leading to a malloc() call such as: The last version has some benefits in that if the type of ppc changes, the expression still allocates the correct space.

What does ** mean in C?

In this case, double means a variable of type double. double* means a pointer to a double variable. double** means a pointer to a pointer to a double variable. In the case of the function you posted, it is used to create a sort of two-dimensional array of doubles. That is, a pointer to an array of double pointers, … Read more

Invalid type argument of -> C structs

a is of type Album* which means that a[i] is of type Album (it is the ith element in the array of Album object pointed to by a). The left operand of -> must be a pointer; the . operator is used if it is not a pointer.

How to convert const char* to char* in C?

To be safe you don’t break stuff (for example when these strings are changed in your code or further up), or crash you program (in case the returned string was literal for example like “hello I’m a literal string” and you start to edit it), make a copy of the returned string. You could use … Read more