In your function int huffman(node_t *huff, int n) you try to realloc() the huff pointer but in C we pass variables by value so you only receive a copy of the pointer. This means caller retains the original pointer and the realloc() memory is lost when you return from the function. You need to pass … Read more
Just create an object of emp1 inside your main, and give it a value like below and it should be ok emp1 emp; emp.number.number1=3; //printf then with emp.number.number1 😉 solved accessing values structure within structure? [closed]
this is really straightforward: typedef struct { int x; int y; } Point_t; Point_t f(int x, int y) { Point_t p = { x, y }; return p; } And (to beat possible comments upfront): no, this is not returning a reference to a local variable. solved How can write “takes 2 integers, returns a … Read more
#include <stdio.h> #include <stdlib.h> int main() { struct hash { int pages; int price; }; struct hash *h[2]; h[0] = malloc(sizeof(struct hash)); h[0]->pages = 1; h[0]->price = 2; h[1] = malloc(sizeof(struct hash)); h[1]->pages = 3; h[1]->price = 4; printf(“value = %d\n”, h[0]->pages); } solved Access element of array of pointer of structure
Options() is your default constructor. Structs and classes are equivalent in the sense that they can have methods and constructors. What’s after : is the initialisation list for Options(). It tells you that in your default constructor for Options(): num_particles is initialised to NUM_PARTICLES ule_lbp is initialised to false infile initialised to an empty string … Read more
Starting at the left hand side: struct foo *ptr declares ptr to be of type struct foo *, that is a pointer to struct foo. The = initializes that ptr variable to whatever the right hand side evaluates as. And the right hand side (struct foo *) p2 is an expression that casts p2 to … Read more
Well, this is a problem: fillwordnr(f,p[].ptrletter,p[].numbers,lines,nrofline,a,c,string[]); You have to specify which element of p you want to work with – p[0], p[1], p[i], etc. Assuming nrofline is a valid index for p, you would write fillwordnr( f, p[nrofline].ptrletter, p[nrofline].numbers, lines, nrofline, a, c, string ); Honestly, based on the code you’ve posted, it’s not clear … Read more
You should debug your code by yourself. void stack::push(int *dat) { ch::LinkList* newNode = new ch::LinkList; newNode->initialize(dat,ptr); ptr->head = newNode; } void stack::ch::LinkList::initialize(int *dat, ch *nxt){ data = dat; if(nxt->head) next = nxt->head; else next = 0; } Note that: ptr is nullptr,so nxt is a nullptr too. So you crash… make ptr not null, … Read more
You can do it like that for (int i = 0; i < present.size(); ++i) cout << present[i]->id << ” “; or in C++11 for (auto p : present) cout << p->id << ” “; I hope it helps solved Displaying the elements of a vector of structure [closed]
Now how can I sort the data by id With a sort. Since this smells like homework, you may or may not be allowed to use the venerable qsort function. (I don’t know how to get the number of elements in that string) strlen and how to search by name or address Try using functions … Read more
p is a pointer to a structure – this means that p ‘holds’ the starting address for a structure in memory — Hence: p = d.elmts+i represents the starting address in memory, for the current structure (i represents the address offset). In this example memory has been allocated for ‘dictSize’ structures (i.e. the number of … Read more
The members of struct person are fixed in size, and are not allocated separately from the struct instance – short answer is that you cannot resize the arrays, nor can you deallocate their storage without deallocating the entire struct instance. The absolute best you can do in this case is to write an empty string … Read more
Well the second one is nonsense in many way. You don’t want to do that. The second if used only – then think how would you pass it to the function. There are innumerous problem that you would face – one of them shown below :- void fun( myStructure z){ printf(“%d\n”, z.id); } myStructure zz; … Read more
Your code as written has several syntax errors, and also your comparison function doesn’t do quite what you want. Quoting from the manpage for qsort: The comparison function must return an integer less than, equal to, or greater than zero if the first argument is considered to be respec‐ tively less than, equal to, or … Read more