27 ian

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



string raspuns_altfel = "normal";

float rezolva( string ec )
{
    bool gasit_egal = false, gasit_minus = false;
    int termen_liber_st = 0, termen_liber_dr = 0;
    int coef_st = 0, coef_dr = 0, s = 0;
    int i, j, n = ec.size();
    cout << "Ecuatia introdusa: " << ec << endl << endl;
    int A, B;
    i = 0;
    while( i < n )
    {
        //cout << "ec[" << i << "] = " << ec[i] << endl;
        //cin.get();
        if( ec[ i ] == '=' )
            {
                gasit_egal = true;
                ++i;
                continue;
            }
        if( ec[i] == '-' )
            gasit_minus = true;


        if( ec[i] >= '0' && ec[i] <= '9' )
            {
                s = ec[i] - '0';
                //cout << "   Plec cu S = " << s << endl;
                ++i;

                /// Partea asta de while creeaza probleme: ar trebui sa prelucreze doar cifrele
                /// de extinderea mai departe trebuie sa se ocupe while-ul mare.
                while( i < n )
                    {
                        if( ec[i] >= '0' && ec[i] <= '9' )
                            s = s * 10 + (ec[i] - '0');
                        if( ec[i] == 'x' ) /// Atentie la ceva de tipul: 2x=3
                            {
                                coef_st += s;
                                ++i; /// Trec la urmatorul caracter care poate fi: +, -, = sau sfarsit
                                break; /// i indica pe x
                            }
                        if( ec[i] == '=' )
                            {
                                termen_liber_st += s;
                                gasit_egal = true;
                                cout << endl << "DREAPTA" << endl << endl;
                                break;
                            }
                        if( ec[i] == '+' || ec[i] == '-' )
                            {
                                if(gasit_egal == false )
                                    termen_liber_st += s;
                                else
                                    termen_liber_dr += s;
                                break;
                            }

                        ++i;
                    }
            }
        cout << "Pana acum, numarul format: " << s << endl;
        cin.get();
        if(gasit_minus == true )
            {
                s = -s;
                gasit_minus == true;
            }
        if( gasit_egal == false ) /// tin cont de ultimul numar (coef ori termen liber) de dinainte de egal
            {
                coef_st += s;
                termen_liber_st += s;
            }
        else
            coef_dr += s;

        cout << "Termen liber st: " << termen_liber_st << endl;
        cout << "Termen liber dr: " << termen_liber_dr << endl;
        cout << "Coef st: " << coef_st << endl;
        cout << "Coef dr: " << coef_dr << endl;
        ++i;
    } /// se inchide while-ul mare


    if( ec[ n - 1 ] != 'x' ) /// Daca e termen liber
        termen_liber_dr += s;

    A = coef_st - coef_dr;
    B = termen_liber_dr - termen_liber_st;

    cout << "Ecuatia restransa este:" << endl;
    cout << A << " * x   =  " << B << endl;


    if( A == 0  && B != 0 )
        raspuns_altfel = "imposibil";
    if( A == 0 && B == 0 )
        raspuns_altfel = "infinit";
    if( raspuns_altfel == "normal" )
        return (float) B / A;
    else
        return -999999;
}




int main()
{
    string ecuatie;
    cin >> ecuatie;
    //cout << "Semnul = are codul: " << (int)'=' << endl;
    //cout << "Semnul + are codul: " << (int)'+' << endl;
    //cout << "Semnul - are codul: " << (int)'-' << endl;
    float solutie = rezolva( ecuatie );

    if( raspuns_altfel != "normal" )
        cout << raspuns_altfel << endl;
    else
        cout << solutie << endl;

    return 0;
}