reading .txt until end of line

[sporx]

I am working on a reverse polish notation calculater. It works for one set of data, however i cant seem to figure out how to make it work if there is more than one row of data to use. for example, if the text file looks like this:

3 4 5 + -
4 3 2 * -
1 2 4 5 - + +

how would i get it to stop reading after the end of the first line so that i could reset everything and start anew for the second set of data?


heres the code

#include <iostream>
#include <vector>
#include <string>
#include <stdexcept>
#include <fstream>
#include <stack>
using namespace std;

int pop(vector<int>& stk);
ifstream indata;

int main() {


    indata.open("testfile.txt");   //opens the test file
        if (!indata) {
            cerr << "Unable to open file testfile.txt";    //check to see if testfile.txt was found
            }

    vector<int> Stack;
     string input;          // to read number or operator

    while (!indata.eof()) {

      indata>>input;
        if (isdigit(input[0])) { // if first is digit, it's number.
            Stack.push_back(atoi(input.c_str())); // convert, push

        } else { // If it's not a number, assume it's an operator
            int first, second;
            switch (input[0]) {
              case '+': Stack.push_back(pop(Stack) + pop(Stack));
                        break;
              case '-': second = pop(Stack);
                        first  = pop(Stack);
                        Stack.push_back(first - second);
                        break;
              case '*': Stack.push_back(pop(Stack) * pop(Stack));
                        break;
              case '/': second = pop(Stack);
                        first  = pop(Stack);
                         Stack.push_back(first/ second);
                        break;
             case '/n': cout<<"this";
              default:  throw domain_error("Undefined operator");
            }
            cout << "Result: " << Stack.back() << endl;
        }
    }
    return 0;
}

int pop(vector<int>& stk) {
    if (stk.empty()) {
        throw underflow_error("Stack underflow.");
    }
    int result = stk.back();
    stk.pop_back();
    return result;
}

i know its something simple, ive just been staring at the code for way too long and cant think.. lol

[firedraco]

Use std::getline() to get an entire line and then perform your operations on that.

[imi]

*scratching my head*.... didn't I just answered this a minute ago? http://www.cplusplus.com/forum/general/20464/