[c-prog] Re: C++ code for Postfix calculator using stacks reading input from a text file

[fecress]

--- In c-prog@yahoogroups.com, andrew clarke <[EMAIL PROTECTED]> wrote:
>
> On Mon 2008-10-13 17:33:48 UTC-0000, fecress ([EMAIL PROTECTED]) wrote:
> 
> > Please help me to write the code for a calculator that evaluates
> > postfix expressions using 
> > stacks and reading input from a text file.
> > What template file do I need?
> > How can I read the postfix expression from file?
> > Please help!!!
> 
> What have you done so far?
>


This is what I did so far,.....
Do I need a separate class, How many files do I need for this, or can I able to 
put them all 
in one file. This code below is not working?


#include <cstdlib> 
#include <iostream> 
#include <fstream> 
#include <string> 


using namespace std; 

//Global Stuff 
ifstream infile; 
ofstream outfile; 

int main(int argc, char *argv[]) 
{ 
    Stack<string> ss; 
    char file[45]; 
    string hold; 
    string operators; 
    string popme; 
    int numnum = 0; 
    int opnum = 0; 
    char ch; 
    
    
        ifstream File;
        File.open("postfixtext.txt");
        if (!File.is_open())
        {
                cout << "File not found!!!!";
                exit(1);
        }
          
    else 
    { 
        cout << "Opening file.." << endl; 
        while(!file.eof()) 
        { 
            ch = file.peek(); 
            if (ch != ' ') 
            if ((ch >= '0') && (ch <= '9')) 
                { 
                    file >> hold; 
                    ss.push(hold); 
                    numnum++; 
                } 
            if (ch == '+' || ch == '-' || ch == '*' || ch == '/') 
                { 
                    file >> operators; 
                    ss.push(operators); 
                    opnum++; 
                } 
            else 
                file.ignore(1); 
                 
        } 
     system("pause");
  return 0;       
    } 

I don't know what to do from here, Please help me!!!