Strings, C++ (vc++)

Language: Layout:

//Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x86

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

int main()
{
    string a = "<thing> <> <yeah/> <another/> </thing> <last></last>";
    vector<string> tokens;
    int rightBraces = 0;
    int leftBraces = 0;
    
    /* Search for imbalanced brackets */
    for(int i=0; i < a.length(); i++)
    {
        if(a[i]=='<') leftBraces++;
        if(a[i]=='>') rightBraces++;
    }
    if(leftBraces!=rightBraces)
    {
        cout << "Imbalanced brackets <> in string." << endl;
        return 0;
    }
    
    /* Gather possible tokens */
    for(int i=0; i < a.length(); i++)
    {
        if(a[i]=='<')
        {
            cout << "i: " << i << endl;
            int pos = a.find('>', i);
            int badBrace = a.find('<', i+1);
            cout << "pos: " << pos << endl;
            cout << "badBrace: " << badBrace << endl;
            if(badBrace < pos && !(badBrace==string::npos))
            {
                cout << "Nested brackets not allowed." << endl;
                return 0;
            }
            cout << "First substring character: " << a[i+1] << endl; // Note: not always true; for <> first substring char is a[i]
            cout << "Last substring character: " << a[pos-1] << endl; // last substring char is a[pos]
            string substring = a.substr(i+1, pos-i-1);
            cout << "Possible tag: " << substring << endl;
            tokens.push_back(substring);
            i = pos;
            cout << endl << endl;
        }
    }
    cout << "*END EXAMPLE*" << endl << endl;
    
    cout << "Elements of tokens:" << endl;
    for(int i=0; i < tokens.size(); i++)
    {
        cout << tokens[i] << endl;
    }
    /*string c = "10";
    string one = "1";
    string zero = "0";
    bool check1 = one[0] == c[0];
    bool check2 = zero[0] == c[1];
    cout << check1 << " " << check2 << endl;
    */
    
    /*bool valid = true;
    string one = "1";
    string zero = "0";
    string test = "1b";
    for(int i = 0; i < test.length(); i++)
    {
        if(one[0] != test[i])
        {
            if(zero[0] != test[i])
               {
                   valid = false;
                   break;
               }
        }
    }
    cout << valid;
    */
    
    /*string empty1 = "";
    string empty2 = "";
    cout << empty1.compare(empty2);
    */
}

Show compiler warnings [ + ] Compiler args [ + ] Show input
Compilation time: 1,98 sec, absolute running time: 0,33 sec, absolute service time: 2,32 sec