ad hoc scanner issues, unable to determine the problem

[berserk foreal]

So far i have this code that is suppose to be an ad hoc scanner, im not sure
where exactly the problem is because i get a very odd error in the output.txt
file. it all starts when the program hits the left parenthesis, is there
somthing wrong with my checkforoperators function? i have looked but have found
little and have even asked others, but no reall luck as to what the problem is.

the input file contains this

read A1
read A2
sum:=(A1-33)+A2*5.5
write sum
write (A1+A2)/2

the output file should look like this

read
A1
read
A2
Sum
:=
(
A1
-
33
)
+
A2
*
5.5
write
sum
write
(
A1
+
A2
)
/
2

actual output.txt

read
A1
read
A2
sum
:=
rCommandA1and33CommandmmandA2ommand5....................................................................................................................................................................................................................................................................................................................

main file

#include <iostream>
#include <string>
#include <fstream>
using namespace std;

// This program is an ad-hoc scanner.
// It will recognize tokens and seperate them.
// this language will NOT DISTINGUISH between uppercase or lowercase.

    void stripSpacing(string &);
    void checkForCommands();
    void checkForLetters();
    void checkForOperators();
    void checkForAssignment();
    void checkForDecimal();
    void checkForDigit();

    int x1 = 0;
    int x2 = 0;
    int vars[10];
    // Only for demonstration purposes, we could use a dynamic array for larger purposes.

    string holder;
    // used to hold the current string before processing.

    fstream handling;
    // file handling from other libraries.
    fstream output;

    char temp1[1];
    char temp2[1];
    int x = 0;
    int xtemp = 0;

int main()
{
    output.open("output.txt");
    handling.open("input.txt");

    if (handling.is_open())
    {
        while (!handling.eof())
        {
            dcom:
            getline (handling,holder);
            if(holder[x] == '/' && holder[x+1] == '/')
            {
                cout << "This line has only comments.... REMOVED :)" << endl;
                //do nothing :)
                goto dcom;
            }
            cout << endl;
            stripSpacing(holder);
            cout << "The line is this long after removing spaces: " << holder.length() << endl;
            cout << "The line contains: " << holder << endl;
            cout << endl;

            while(holder.length() != x)
            {
                // let's check for commands, such as read write or sum.
                checkForOperators();
                checkForAssignment();
                checkForDecimal();
                checkForDigit();
                checkForCommands();
                checkForLetters();
            }
            output << "\n";
            
            x=0;
        }

    handling.close();
    output.close();
    return 0;
    }
}

void stripSpacing(string &str)
{
    for (int i=0; i<str.length(); i++)
        if (str[i]==' ')
        {
            str.erase(i,1);
            i--;
        }
}
void checkForOperators()
{
    if(holder[x] == '(' || holder[x] == ')'|| holder[x] == '+' || holder[x] == '-' || holder[x] == '*' ||holder[x] == '/')
    {
        output << holder[x] + "\n";
        x++;
    }
    cout << "checkForOpertors" << endl;
}

void checkForCommands()
{
    xtemp = x;
    if(holder[x] == 'w')
    {
        x++;
        if(holder[x] == 'r')
        {
            x++;
            if(holder[x] == 'i')
            {
                x++;
                if(holder[x] == 't')
                {
                    x++;
                    if(holder[x] == 'e')
                    {
                        x++;
                        output << "write\n"; goto stop;
                    }else{x=xtemp; goto stop;}
                }else{x=xtemp; goto stop;}
            }else{x=xtemp; goto stop;}
        }else{x=xtemp; goto stop;}
    }

    if(holder[x] == 'r')
    {
        x++;
        if(holder[x] == 'e')
        {
            x++; 
            if(holder[x] == 'a')
            {
                x++;
                if(holder[x] == 'd')
                {
                    x++;
                    output << "read\n"; goto stop;
                }else{x=xtemp; goto stop;}
            }else{x=xtemp; goto stop;}
        }else{x=xtemp; goto stop;}
    }

    if(holder[x] == 's')
    {
        x++;
        if(holder[x] == 'u')
        {
            x++;
            if(holder[x] == 'm')
            {
                x++;
                output << "sum\n"; goto stop;
            }else{x=xtemp; goto stop;}
        }else{x=xtemp; goto stop;}
    }

    stop:
    cout << "checkForCommand" << endl;
}

void checkForLetters()
{
    if(isalpha(holder[x]))
    {
        output << holder[x];
        x++;
    }
    cout << "checkForLetters" << endl;
}

void checkForAssignment()
{
    if(holder[x] == ':')
    {
        x++;
        if(holder[x] == '=')
        {
            output << ":=\n";
            x++;
        }
        else
        {
            cout << "ERROR!!! NO : BEFORE =" << endl;
        }
    }
    cout << "checkForAssign" << endl;
}

void checkForDecimal()
{
    if(holder[x] == '.')
    {
        x++;
        if(isdigit(holder[x]))
        {
            output << '.';
            x--;
        }
    }
    cout << "checkForDeci" << endl;
}

void checkForDigit()
{
    if(isdigit(holder[x]))
    {
        output << holder[x];
        x++;
    }
    cout << "checkForDig" << endl;
}

[histrungalot]

In checkForDecimal: I don't think you want to do the x--.
In checkForOperators: Change the output line to:
output << holder[x] << "\n";

I get:

$ cat output.txt 
read
A1
read
A2
sum
:=
(
A1-
33)
+
A2*
5.5
write
sum
write
(
A1+
A2)
/
2

You need to fix the A1-, 33), A2*, A1+ and A2)