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  1. #1
    Join Date
    Apr 2018

    Create a new stack in which to put every third element of the first stack

    I need some help.
    I have to do the following task:
    Create a stack with numbers in the range from -50 to +50. After creating the stack, perform the following actions: create a new stack, in which every third element of the first stack will be placed. Upon completion, all stacks must be removed.

    I was able to write the code of the program with creating a stack in the specified range, viewing and deleting it, but I can not implement the function to create the second stack.

    #include "stdafx.h"
    #include <iomanip>
    #include <stack>
    #include <iostream>
    #include <ctime>
    using namespace std;
    struct Stack     
    	int info; 
    	int in;
    	Stack *next; 
    } *begin1, *second;  
    Stack* InStack(Stack*, int);
    void View(Stack*);
    Stack* DelStackAll(Stack*);
    int main()
    {	srand(time(0));
    	int i;  
    	for(i=1; i<=10; i++)
    		begin1=InStack(begin1, rand()%101-50); 
    Stack* InStack(Stack *p, int in){ 
    	Stack *t=new Stack; 
    	return t;
    void View(Stack *p)    
    	Stack *t=p;       
    	while (t!=NULL) 
    Stack* DelStackAll(Stack *p)
    { Stack *t; 
    	while(p != NULL) {
    		delete t;
    	return p;
    I will be very grateful for the help!

  2. #2
    2kaud's Avatar
    2kaud is offline Super Moderator Power Poster
    Join Date
    Dec 2012

    Re: Create a new stack in which to put every third element of the first stack

    - you need to first initialise begin1 and second to nullptr as currently the first time begin1 is passed to InStack it's value is undefined.

    - iterate the stack begin1 and for every third entry (keep a counter of the number of entries in the iteration and if % 3 (mod 3) is 0 then you have a third entry) then just call InStack(second, n) where n is the value from the iteration of begin1. This will create the stack second. Then just use View(second) to display the second stack etc.
    All advice is offered in good faith only. All my code is tested (unless stated explicitly otherwise) with the latest version of Microsoft Visual Studio (using the supported features of the latest standard) and is offered as examples only - not as production quality. I cannot offer advice regarding any other c/c++ compiler/IDE or incompatibilities with VS. You are ultimately responsible for the effects of your programs and the integrity of the machines they run on. Anything I post, code snippets, advice, etc is licensed as Public Domain https://creativecommons.org/publicdomain/zero/1.0/ and can be used without reference or acknowledgement. Also note that I only provide advice and guidance via the forums - and not via private messages!

    C++17 Compiler: Microsoft VS2017 (15.7.5)

  3. #3
    Join Date
    Apr 2018

    Re: Create a new stack in which to put every third element of the first stack

    Ok, thank you,I understood what I need to do, but there may be another way to do this operation without a counter, since I need to write this function without using what you described.

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