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
I’m learning C and I’m still not sure if I understood the difference between & and * yet. Allow me to try to explain it: I got these, but then it becomes confusing. So, both funct(*a) and funct(&a) are correct, right? What’s the difference?
I’ll interpret your question as two questions: 1) why -> even exists, and 2) why . does not automatically dereference the pointer. Answers to both questions have historical roots. Why does -> even exist? In one of the very first versions of C language (which I will refer as CRM for “C Reference Manual“, which came with 6th Edition Unix in … Read more
and Are just the same thing. so does: And once you declared the reference, you can think of it just like the actual variable itself. so you don’t need particular operator to dereference it. when passing variables through function arguments, the raw object is always shallow copied in memory to the new variable in the … Read more
Reviewing the basic terminology It’s usually good enough – unless you’re programming assembly – to envisage a pointer containing a numeric memory address, with 1 referring to the second byte in the process’s memory, 2 the third, 3 the fourth and so on…. What happened to 0 and the first byte? Well, we’ll get to … Read more
Reviewing the basic terminology It’s usually good enough – unless you’re programming assembly – to envisage a pointer containing a numeric memory address, with 1 referring to the second byte in the process’s memory, 2 the third, 3 the fourth and so on…. What happened to 0 and the first byte? Well, we’ll get to … Read more
I saw a question the other day where someone inadvertently used an incomplete type by specifying something like The compiler knew that struct A was a struct, despite A being totally undefined, by virtue of the struct keyword. That was in C++, where such usage of struct is atypical (and, it turns out, can lead … Read more
I’m trying to use the char method isLetter(), which is supposed to return boolean value corresponding to whether the character is a letter. But when I call the method, I get an error stating that “char cannot be dereferenced.” I don’t know what it means to dereference a char or how to fix the error. … Read more
The type char is a primitive — not an object — so it cannot be dereferenced Dereferencing is the process of accessing the value referred to by a reference. Since a char is already a value (not a reference), it can not be dereferenced. use Character class: