I am attempting to copy the elements of one dynamically-allocated array (addVec) into another (array) in memory, after passing a pointer to the array from main to a function (changeArray) that assigns values to addVec. My approach thus far: Dynamically allocate an array (array) in main Dynamically allocate another array (addVec) in changeArray() Pass the… Read More How to copy element from one array to other element of array using pointers?

So, i have to make a function that takes a 2d array as parameter with a pointer, specifically, so that cant be changed. This function that i wrote works, but when i print it, it only prints zeros. When printing directly in main() it works normally. Thanks in advance! Code: void calcula_media(float (*matriz)[3]){ int i,… Read More When passing a 2d array as parameter with pointers to print its values it only prints zero

Given the following setup… struct A {unsigned char _data;}; struct B {unsigned char _data;}; struct C {A a; B b;}; // in this context (ar) is known to be the "a" of some C instance A& ar = …; B& br = get_sister(ar); // the "b" of the same C instance that (ar) belongs to… Read More C++ structure reference from member reference

I have trouble understanding what pointer2 contains. The second printf prints llo World, but the third one prints Hey you guys!. Why would it be like that if strcpy copies y you guys!\n into llo World. From my understanding of the below program the last output supposed to be llo Worldy you guys!\n, isn’t it?… Read More Pointer seems not be sync with printf's output

I need to write function which will check if string s2 is reverse substring of string s1, and return 1 if the condition is true. Function should be made using pointer arithmetic. For example: char s1[] = "abcdef"; char s2[] = "edc"; Function would return 1 because string s1 contains reverse string s2. #include <stdio.h>… Read More Check if string is reverse substring

Why does printf("%ld\n", (void *)0 – (void *)0); compile, but printf("%ld\n", (void *)0 + (void *)0); does not? >Solution : It is useful to find the difference between two pointers. This gives an integer (a ptrdiff_t).[1] It is useful to add a difference to a pointer, so we can an integer to a pointer (and… Read More Why can void pointers be subtracted but not added?