This has the functionality I want (and it works) #include <stdio.h> //includes other libraries needed int foo(); int main() { while(true) { while(foo()==1) { //do something } //does other unrelated things } } int foo() { // Returns if a switch is on or off when the function was called...
We have a function longest, which returns the longest substring that consists of letters. Example: longest("112****hel 5454lllllo454") would return: lllllo However, when I run the program it seems to return lllllo454. Here is the function: char *longest(char *s){ char *pMax = NULL; int nMax = 0; char *p = NULL; int n...
I have this code: #include <stdio.h> int getAns(void); int num; int main() { int (*current_ans)(void); current_ans = &getAns; // HERE printf("%d", current_ans()); } int getAns() { return num + 3; } However, is it possible to have something in the // HERE spot that allows the next line to be printf("%d", curre...
If you are someone who programs in C or C++, without the managed-language benefits of memory management, type checking or buffer overrun protection, using pointer arithmetic, how do you make sure that your programs are safe? Do you use a lot of unit tests, or are you just a cautious coder? Do you have other methods? ...
Hi, Recently I was reading about Article on Interviewing an Software Engineering Position by Joel and he mentioned about asking candidate about Recursion and Pointer's after some simple puzzles. I wonder why Pointers and Recursion are considered to be complicated Issues ? Update: What can be done to improve on Pointers and Recursion...
Hi, I have a few const arrays of the same base type but different sizes, and I need to point to them in the const records. The code below compiles successfully, but finishes with error. type Toffsets = array of integer; Trec = record point1: Tpoint; //complete size point2: Tpoint; aOf...
I'm updating some code in a library because i've found out my original code assumed 32bit pointers. I have my own thinkings on how to fix it, but for thoroughness, I want to ask what are some techniques you would use to make this code work for both 32bit and 64bit without a macro? char *argList = (char *)malloc(sizeof(id *) * arguments...
I want to know what is happening in memory when you declare: int **array; ...
I'm doing (something like) this: void insert(Node*& node, string val, Node* parent) { if (node == NULL) instantiateNode(node, val, parent); else insert(node->child, val, node); } The thing is, that instantiateNode(..., parent) seems to modify the original *&node passed into the function when setting the *parent. instan...
When I do: int x[] = new int[2]; System.out.println("...> " + x); the output value is like this: [I@1b67f74 so that hex number is concerning to the memory address where the object has been allocated? and [I what does it meaning? ...
If I understand slicing correctly I don't think this could happen with pointers or smart pointers. For example, if you had: class A { int something; }; class B : public A { int stuff; int morestuff; }; int main() { std::shared_ptr<B> b(new B()); std::shared_ptr<A> a; a = b; } My understanding is that the block of memory ...
I had come across the following code: typedef struct { double x; double y; double z; } *vector Is this a valid type definition? The code compiles and runs fine. I was just curious if this is common practice. ...
#ifndef DELETE #define DELETE(var) delete var, var = NULL #endif using namespace std; class Teste { private: Teste *_Z; public: Teste(){ AnyNum = 5; _Z = NULL; } ~Teste(){ if (_Z != NULL) DELETE(_Z); } Teste *Z(){ _Z = new Teste; return _Z; } void Z(Teste *va...
Hello! I'm trying to have pointer to class methods, so I have something like: class foo { public: static void bar() { } }; void (foo::*bar)() = &foo::bar; That doesn't compile :( I get: > error: cannot convert ‘void (*)()’ to > ‘void (foo::*)()’ in > initialization ...
as in the title, what's the difference because these two seem to get me the same results? ...
Hi all, Currently the below code gives me a warning when i try to compile it: int z; char *w; w = How can i cast &z properly so that w stores the pointer to z's address? ...
int *w; int **d; d = &w; What does the **d store exactly? ...
I am very confused about when to use string (char) and when to use string pointers (char pointers) in C++. Here are two questions I'm having. which one of the following two is correct? string subString; subString = anotherString.sub(9); string *subString; subString = &anotherString.sub(9); which one of the following two is correct?...
I have the following code, so far, I want to check if a file name is already in the linked list fileList (or flist). according to the output, the string saved in the first Node was changed somewhere in Node* getFileName(Node *&flist) How did this happen? Also, is there anything else that I'm doing is wrong or not safe regarding pointers ...
Every time I try to use my add function and return a list from it. I get an undefined symbol error. What am I doing wrong here. this is the error: Undefined first referenced symbol in file add(std::list<int, std::allocator<int> > const&, std::list<int, std::allocator<int> >)/var/tmp//...