main.cpp

#include<fstream>
#include<iostream>
#include<string>
#include<sstream>
using namespace std;
 
typedef unsigned int uint;
 
 
//
// ispis Tree u infix formatu
//
void showTree(string& output, stringstream& ss)
{
    string token;
 
    ss >> token;
 
    if(token == "+" || token == "-" || token == "*" || token == "/") {
        output += "(";
        showTree(output, ss);
        output += token;
        showTree(output, ss);
        output += ")";
    }
    else if(token == "sqrt" || token == "log" || token == "sin" || token == "cos") {
        output += token + "(";
        showTree(output, ss);
        output += ")";
    }
    else
        output += token;
 
    return;
}
 
 
 
int main(int argc, char **argv)
{
    string ind;
 
    if(argc > 1) {
        ifstream infile(argv[1]);
        if(!infile) {
            cout << "nema fajla!" << endl;
            return 1;
        }
        getline(infile, ind);
    }
    else {
        cout << "daj: ";
        getline(cin, ind);
    }
 
    string output;
    stringstream ss;
    ss << ind;
    showTree(output, ss);
    std::cout << output << endl;
 
    if(argc > 2) {
        ofstream outfile(argv[2]);
        outfile << output << endl;
        outfile.close();
    }
 
    return 0;
}