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.
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 __________________________________________________ _
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;
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:
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: #include<stdio.h> #include<conio.h> #include<string.h> #include<ctype.h> #define MAX 50
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My output should look like this ..
Enter an expression in infix form: (9+6)/(2*4)^15
Specify output expression type,1) Prefix 2)Postfix The Prefix expression is: /+96^*2415 ---------------------------------------------- Enter an expression in infix form: (9+6)/(2*4)^15
Specify output expression type,1) Prefix 2)Postfix The Postfix expression is:96+24*15^/
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;
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
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.
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
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;
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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.
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.
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;
I'm having some significant trouble with an assignment to create a postfix calculator that simulates the dc calculator function in linux. I have attached the handout with project instructions, but my main problem at the moment lies with parsing through the string input and adding the numbers into a stack of ints.
Project #2.pdf (47.78K)
Here's a brief summary of the methods used in the switch statement:
OPERATORS AND COMMMAND INPUTS + : Pops two values off the stack, adds them, and pushes the result. - : Pops two values, subtracts the first one popped from the second one popped, and pushes the result. * : Pops two values, multiplies them, and pushes the result. / : Pops two values, divides the second one popped from the first one popped, and pushes the result. % : Pops two values, computes the remainder of the division that the / command would do, and pushes that.
Commands
p - Prints the value on the top of the stack, without altering the stack. A newline is printed after the value.
f - Prints the entire contents of the stack without altering anything. A newline is printed after each value
n - Prints the value on the top of the stack, pops it off, and does not print a newline after.
c - Clears the stack, rendering it empty.
d - Duplicates the value on the top of the stack, pushing another copy of it. Thus "4d*p" computes 4 squared and prints it.
r - Reverses the order of (swaps) the top two values on the stack.
Exception handling also needs to be added to account for division by zero and and invalid operator.
Right now my biggest problem is that I keep getting the following strange output where a 0 is automatically added to the stack when I call a function or operator. I realize this is probably because of the lines I have placed outside of the for loop that read
//END FOR LOOP int num = atoi(operands.c_str()); myStack.push(num); operands = ""; cout << num << " added." << endl;
But when I tried putting these statements INSIDE the for loop, I just get more errors. I've been working on this for a number of hours but I can't figure out my issue. I've also attached an image of my current output.
/* 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();
since I didn't know how to type epsilon symbol temporarily I am using ^
char prod[20][20],T[20],NT[20],c[10][10],foll[10][10],fir[10][10]; int tt,tnt,tp,a; int follow[20][20],first[20][20]; void first_of(char); int count(int j); void rhs(int j);
So I tried debugging this program almost 10 times, each time finding a problem then making code to fix it, I used to get wrong values but then now after I changed the calculation from an infinity while loop to a for loop (because after some changes I realized that now I know the number of entries, meaning the start and the end of the loop) the program now displays no values at all. I checked it thoroughly and until the calculation process its functioning exactly the way it should but then the calculation breaks hell loose . Also the for loop that raises 2 to the power needed works fine too so it must be something with the other processes included in the calculation....
This used to be a function of a multiple value types conversion program, I isolated it for easier analysis as a lone standing program.
Code: #include<iostream> using namespace std; int main() { int d[10],e[10],anse=1,r,limit; short int counterd=0,i,j; float bind=0;
i created a windows service that will run another program. but the program i want to run has a gui and i don't want the gui to be visible, i just want the program to run in the background.
But i have to do it without editing the gui program
i tested this code with notepad and it runs notepad in the background without displaying the window but when i try run my program it doesn't work. i don't know why its works for one program and not the other..
I am trying to use pointers in a stack program. But i am failing. my push function takes in the array,item im pushing, the reference to the top, and the size of the array.
void push(char stack[], char item, int *top, int max_size) { if(&top==(max_size-1)) { printf("Stack is Full"); return; } else { *top=+1; stack[*top]=item; } return; }
And in the main function i pass a randomly pick char value, print it first , and pass it to the array using the push function
#define STACK_SIZE 10 #define STACK_EMPTY -1 int main(){ char s[STACK_SIZE]; int s_top = STACK_EMPTY; // The index of the top of the stack int *top= s_top; int max_size=STACK_SIZE;
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I know I am not referencing and dereferencing correctly and probably other stuff also. but i get these 2 errors:
stack.c: In function "push": stack.c:23:9: warning: comparison between pointer and integer [enabled by default] if(&top==(max_size-1))
I need to create a conversion program to convert kilograms to pounds. The user will enter a number for weight and a char for unit of measurement K= kilo or P=pound and the program should display the other corresponding weight.
