infix to postfix

[nightrider]

//

//
//
// Copyright © 2016 Suraj Patel . All rights reserved.
//

#include <cstdlib>
#include "stack2.h"
#include<cctype>
#include<iostream>
#include<cstring>
#include <stack>

//evaluates


using namespace std;


double priority(char infix )

{
double temp;

if( infix =='^')

temp = 1;
else
{
if(infix == '*' || infix =='/')

temp = 2;
else
{
if(infix =='+' || infix =='-')

temp = 3;
}
}
return temp;
}




int main(){


string s;

string out;

stack<char>operations;

double i;

cout << "Type a fully parenthesized arithmetic expression : " << endl;

getline(cin, s);


for ( i = 0; i < s.length(); i++) {

if (s[i] == '+' || s[i] == '-' || s[i] == '*' || s[i] == '/' || s[i] == '^') {

while (!operations.empty() && priority(operations.top()) <= priority(s[i])) {

out = operations.top();

operations.pop();
}
operations.push(s[i]);

} else if (s[i] == '(') {

operations.push(s[i]);

} else if (s[i] == ')') {

while (operations.top() != '(') {

out = operations.top();

operations.pop();
}
operations.pop();

} else
{
out = s[i];
}
}


double operand1, operand2, answer = 0;

i = 0;


while (i < s.length())

{

if ( isspace(s[i]) )
{
}

else if ( isdigit( s[i] ))
{
double temp = 0;

do
{
temp = temp*10 + (s[i]-'0');
i++;
if ( i >= s.length())
{

}
} while (isdigit(s[i]));

operations.push(temp);
}
else
{
operand2 = operations.top();

operations.pop();

operand1 = operations.top();

operations.pop();

switch(s[i])
{
case '+': answer=operand1 + operand2;

operations.push(answer);

break;

case '-': answer=operand1 - operand2;

operations.push(answer);


break;

case '*': answer = operand1 * operand2;

operations.push(answer);

break;

case '/': answer=operand1 / operand2;

operations.push(answer);

break;
}

}
i++;
}


cout << "that evaluates : " << answer <<endl;
cin.ignore();
return 0;
}

[kbw]

Please use the code tags to format your code.

If you have a question, please ask it.

[nightrider]

Sorry, forgot to ask. I need it to change from infix to postfix and evaluate at the same time verse two different times.

[keanedawg]

I would like to point out you have no reason to make priority a double. You should make it an int.

You are right for using a priority type function though.

I'm not sure if this is your own code but this does have the jyst of a working infix to postfix. Tell me, is this your code? And if it is, do you know it successfully converts infix to postfix?