C++ :: Creating Infix To Postfix Program Through Inherited Class

Apr 25, 2014

I have the following problem on my C++ Program and I am not sure why it is not working. I am creating a infix to postfix program through an inherited class which I am not sure it is working.

#include <iostream>
#include <stack>
using namespace std;

int in_stack_Priority(char a){
if(a == '*' || a == '/')
return 2;

[Code] .....

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C++ :: Array Base Stack Class - Infix To Postfix Conversion

Feb 4, 2014

Array based stack class. So i am having a problem, i do not understand how to convert an infix notation into a postfix notation from a txt file. The infix expressions are stored in a text file. for example inside the text file is

6+9
2+7*8
(1+5)*3
5+(6-2)*((2-8)

at the moment my header file is

#ifndef STACKS_H
#define STACKS_H
#include <iostream>
using namespace std;
const int STACKS_CAPACITY = 128;
typedef int StacksElement;

[Code] ....

but how to make it convert the into postfix...

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C++ :: Running Infix To Postfix Stack Conversion Program

Mar 27, 2014

I keep getting the same error messages every time on Visual Studio. I don't know where the error is originating. Basically I'm trying to convert an infix expression (A+B-C) to a postfix expression (AB+C-) using stacks.

#include <iostream>
#include <fstream>
#include <string>
#include <stack>
#include "Expression.h"
#include "stackType.h"
using namespace std;
int main() {
string fileName;
string infixExpression, postfixExpression;

[Code] .....

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C/C++ :: Convert Infix To Postfix Using Linked Lists And Stacks - Program Stop Working After 1st Call

Sep 28, 2014

I was given a task to convert infix to post fix using both linked lists and stacks in the code so this is what i have written but the problem is it is giving me same error at three different places "missing function header(old style format?)

#include <iostream>
#include <string>
using namespace std;
const int size = 100;
class stack{
private: // Declare a structure for the list

[Code] ....

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C/C++ :: Infix To Postfix Notation

Sep 14, 2014

I'm trying to make an infix to postfix notation calculator. The difficult thing is th stack class is custom. It's not to hard to understand, I don't know if the fact that it is that way will not allow me to receive support. The difference is that the pop functions is as such:

stack<char> conversion;
char temp;
conversion.pop(temp);//It receives a parameter and puts the popped element in there.
conversion.peek(temp);//Places the top element in said parameter

not only that... but these are boolean functions. they return true if the operation was completed. So they can be used as conditions.

#include<iostream>
#include<string>
#include<stdio.h>
#include"stack.h"
using namespace std;
int main(void) {
Stack<char> conversion;
string infix,inter,temps;

[Code] .....

The error is that i am mismanaging parenthesis handling and i can't seem to grasp where and how.

An example input is:(35+7)-(9-2)
that input gives me:35 7 + 9 2 ) -
but another input such as :(35+7)/7
outputs as: 35 7 + 7 /. Totally fine.

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C++ :: Infix To Postfix Using Stack Conversion

Mar 8, 2013

I am Getting following errors I don't know why.I have mentioned the lines (in comments) where these errors are occurring.
__________________________________________________
warning C4018: '<' : signed/unsigned mismatch
error C2064: term does not evaluate to a function taking 0 arguments
error C2064: term does not evaluate to a function taking 0 arguments
__________________________________________________ _

Code:
/////////////////////////////////////////////////
//libraries
/////////////////////////////////////////////////
#include <iostream>
#include <string>
using namespace std;

[Code] .....

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C++ :: Converting Expression From Postfix To Infix

Oct 1, 2013

Program which convert expression from PostFiz to Infix and also wants to evaluate them....

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C :: Return Local Variable - Infix To Postfix

Nov 21, 2014

So I have been working my way through this assignment and I'm just stuck now. I cannot get this work properly It just tells me I'm trying to return a local variable when attempting to return postfix in the to_postfix function. It is line 97 that wont compile. Also I cannot change anything in runner.c.

Calculator.c
Code:

1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <ctype.h>
4 #include <string.h>
5 #include "stack.h"

[Code] .....

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C++ :: Infix To Postfix Reading From Text File

Feb 6, 2014

So i solved my earlier problem but now how do i make it read from the text file that i have and output the postfix notations? Because right now it is only outputting what is currently in the text file for example

6+9
2+7*8
(1+5)*3
5+(6-2)*((2-8)

Header file is

#ifndef STACKS_H
#define STACKS_H
#include <iostream>
using namespace std;
const int STACKS_CAPACITY = 128;
typedef int StacksElement;

[Code]...

test client cpp is

#include <iostream>
using namespace std;
#include "Stacks.h"
#include <fstream>
#include <string>
#include <cassert>
#include <cctype>

[Code]...

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C/C++ :: Infix To Postfix Conversion And Evaluating Expression

Apr 12, 2015

I am trying to convert from infix to postfix, and then evaluating the postfix expression to get the final answer. I am having a severe problem though, because for somereason the conversion is not working at all. For example, when I input the first infix expression:

24 + 33 * ( 7 - 5 ) + 8 / 3 it ouputs 24 33 7 5 - 5 ) + 8 / 3( 7 - 5 ) + 8 / 3* ( 7 - 5 ) + 8 / 3+ 33 * ( 7 - 5 ) + 8 / 3 8 3/ 3+ 8 / 3

Which is obviously very wrong. I am not really sure where the problem is though.

Below I have included all of the code needed. I also had to create my own stack class, so I will include it too .

#include "stacks.h"
#include <iostream>
using namespace std;
bool IsOperand(char C) {
if(C >= '0' && C <= '9') return true;
if(C >= 'a' && C <= 'z') return true;

[Code] .....

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C++ :: Convert From Infix Expression To Postfix Using Stacks?

May 24, 2014

I need to convert from an infix expression to postfix using stacks!

#ifndef EXPRESSIONMANAGER_H_
#define EXPRESSIONMANAGER_H_
#include <iostream>
#include <stack>
#include <string>
#include <sstream>
using namespace std;
class ExpressionManager : public ExpressionManagerInterface{

[code]....

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C++ :: Calculator Using Stack - How To Convert Operation From Infix To Postfix

Sep 25, 2013

I trying to write a code for a calculator using stack is how to convert an operation from infix to postfix . Here is my attempt I created a header file.

#ifndef STACK_H
#define STACK_H
#include <iostream>
using namespace std;
template<class T>
struct node {
T item;

[Code] .....

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C++ :: Operator Overloading In Inherited Class

Jun 2, 2013

So i am having troubles with operator overloading in inherited class. Basically, it doesnt work. Consider this:

Code:

class A {
public:
A() {
x=0;
z= new int;

[Code] ....

Some how the copy constructor of a is improperly executed - the pointer is copied over, not re-created. As a result, the destructors crashes due to double-free.

*/
B bb = b; //doesnt work
B bbb(b); //doesnt work
B bbbb(b, 0); //works
}

Above code shows the problem well. The "official" copy-constructor wont work - it copies over the pointer directly, and doesnt create a new one as it should. However, if i provide my own pseudo-copy-constructor that works. But ofcourse it's just a cheap work around - and wont actually work in real code (STL).

compiler is VS2008SP1.

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C++ :: Passing Object To Inherited Class By Constructor

May 1, 2013

I am trying to pass an object to an inherited clas by a constructor. I am having Cboard my board and i need to pass it to the object Cpawn.

Here under is my code:

main
Code:
#include<iostream>#include "Cboard.h"
#include "Cpawn.h"
#include "Cpiece.h"

void main(){
char location[50];

[Code] ....

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C++ :: Inherited Class Constructor - Undefined Reference

Jun 18, 2013

I have three classes 1 base and two inherited.. problem is when I try to initialize the it says undefined reference to vtable constructor.

Code:
#ifndef QUOTE_H_INCLUDED
#define QUOTE_H_INCLUDED
#include <string>
using namespace std;

[Code] ....

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C++ :: Create Base Class That Is Derived (inherited) By Three Other Classes?

Apr 30, 2013

how to create a base class that is derived (inherited) by three other classes?

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C++ ::  How To Access A Specific Protected Inherited Member Depending On Class

Dec 30, 2013

I have `MainShop`(base class) then `SwordShop` and `BowShop`(derived classes) and another derived class called `Inventory`. I have a vector under protected in my base class, and when I access it from my derived classes it's okay, but each one has its own value. How can I set them all to have the same value?

//MainShop.h
#pragma once
class MainShop {
private:
//some variables
protected:
vector <string> WeaponInventory;

[code]......

Here every time I run it, it goes straight to the `else` and it displays that I do not have any items. I want to just have one vector for both my bow and Sword shops because vectors take up a lot of memory and my teacher said keep them to a minimum. So I just want one vector that takes in items from my bow class as well as my sword class, but for some reason it's acting as if I have multiple vectors, each with its own set of items.

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C Sharp :: How To Design / Write Global Config Class That Can Be Inherited

Jan 31, 2013

I need to create a GlobalConfig class. But I want to derive from it in another class.

Here's an example:

public class BaseConfig {
 public string GlobalPath {get; set;}
}  
public class ConfigA :  BaseConfig  {
 public string pathA {get; set;}
}  
public class ConfigB :  ConfigA  {
 public string pathB {get; set;}
}

The idea behind is that I don't want to write the code multiple times and what's more important in class ConfigA I want to set GlobalPath and have access to it in ConfigB.

In other word I want class ConfigB to have a property GlobalPath which was set in class ConfigA.

To clarify I want to have only one object of Config in memory.

When I set BaseConf.GlobalPath to 'A', I want to access it from ConfigB.GlobalPath and also get 'A'.

I always design GlobalConfig as a static class, but static classes can't be inherited. So I tried to implement Singleton Pattern, but ConfigA can't find constructor of class BaseConfig because it's private.

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C++ :: Month Class - Overloading Prefix And Postfix?

May 2, 2013

The objective is to build a month class that hold data on the number of the month and the name of the month. Using constructors and overloads, set it up to where you can input either the month or the name and it will output the results for both the month number and name.

Here is the code I have so far:

#include<iostream>
#include<string>
using namespace std;
class Month{
private: string name;
int monthNumber;

[Code] ....

It is almost fully compiled if I go by the error list. The only problems I see to be having are with the prefix and postfix overloads.

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C++ :: Implement Program For Evaluating Infix Expressions

Dec 3, 2014

Also, can't use namespace std for this.

#include<iostream>
#include<stack>
#include<fstream>
#include<iomanip>
#include<queue>
#include<cassert>

[Code] ....

/* It will read in a infix expression from a text file.check if the parentheses in the input expression are balanced.convert the infix expression into a postfix expression and evaluate the expression.*/

int main() {
string expression;
string postfixExpression;
double result;
testBalanced();

[Code] ....

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C++ :: Write A Postfix Calculator Program Using Stack

Dec 14, 2013

i try to write a postfix calculator program using stack in C++ the in put must be the infix expression but can dont know how to write a infix expression in put.

this is my code :

#include <iostream>
#include <stdio.h>
#include <math.h>
#include <conio.h>
using namespace std;
}

[code]....

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C :: Program To Evaluate Postfix Expression Using Array Implementation Of Stack

Apr 26, 2014

Write a program that evaluates postfix expression using array implementation of stack.

The expression [the input] is evaluated from left to right using a stack. When the element read from the expression is an operand, push it into the stack.When the element read from the expression is an operator: Pop two operands from the stack.Evaluate the two operandsPush the result of the evaluation into the stack.

The final result lies on the top of the stack at the end of the calculation. Make sure to display the result before terminating the program.Write a program that evaluates postfix expression using array implementation of stack.

Code:
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#define M 20

typedef struct{

[Code] ....

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C++ :: Creating Array Of Pointers To Base Class To Point To Derived Class Objects Dynamically

Jan 16, 2013

Please consider the following code :

#include <iostream>
using namespace std;
class superclass;
class subclass1;
class subclass2;

[Code] ....

As you can see I want to create a dynamically allocated storage of references to a parent class each of which can then point to a child class, how ever I do not know how to extract the child class out again from that array so i may access its variable b.

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C++ :: Creating One Class Object In Constructor Of Another Class

Sep 20, 2013

Suppose I have two classes A and B so how to access object of class A in constructor of B's class as a parameter.

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C++ :: Creating New Pointer For A Class

Aug 2, 2013

I'm currently reading the C++ Guide for Dummies

Anyway right now I'm working with pointers and classes, and when I create a new pointer for my class it looks like this...

Pen *Pointerpen = new Pen;

But in the book they threw in this...

Pen *Pointerpen = new Pen();

Can you actually designate memory space for a function? Or was this a typo on their part? It's never come up before and they didn't explain it.

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C++ :: Creating Own Vector Class?

Nov 15, 2014

I was trying to implement own vector class and wrote some code. Below is the code.

Code: #include<iostream>
#include<vector>
using namespace std;
template <typename T> class MyVector
{
T *mem;
int m_size,final_size;
public:
MyVector() : final_size(1),m_size(4)
{

[code].....

I have question on this function.

Code: myVecPush_back(T t){}

Here I was able to put elements upto any number of time, but I have allocated memory to only 4 elements in T *mem.

My question, why the program is not crashing when I tried to put elements more that 4?

Is since the variable is of type Template? Any specific reason for this?

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