Lab 2

lab2.cpp

#include "/Users/fr_machine/lab2/rapidxml-1.13/rapidxml.hpp"
#include <fstream>
#include <iostream>
#include <string.h>

using namespace std;
using namespace rapidxml;

double exchange(xml_node<>* root_node, char currency_in[3], char currency_out[3], double amount) {

    double value_in = 0.0, value_out = 0.0;
    int nominal;

    for(xml_node<>* tmp_node = root_node->first_node(); tmp_node; tmp_node = tmp_node->next_sibling()) {

        if(!strcmp(currency_in, tmp_node->first_node("CharCode")->value()))
            value_in = atoi(tmp_node->first_node("Value")->value());

        if(!strcmp(currency_out, tmp_node->first_node("CharCode")->value())) {
            value_out = atoi(tmp_node->first_node("Value")->value());
            nominal = atoi(tmp_node->first_node("Nominal")->value());
        }
    }

    if(value_in == 0 or value_out == 0) {
        cout << "No such currency";
        return -1.0;
    }

    value_out = (value_in * nominal * amount) / value_out;
    return value_out;
}

int main(int argc, char* argv[]) {

    xml_document<> doc;
    xml_node<>* root_node;

    ifstream input_xml("/Users/fr_machine/lab2/currency.xml");
    string buffer((istreambuf_iterator<char>(input_xml)), istreambuf_iterator<char>());
    buffer.push_back('\0');

    doc.parse<0>(&buffer[0]);
    root_node = doc.first_node();

    char currency_in[4];
    char currency_out[4];
    auto sum_str = new char;
    double sum = 0.0;

    cout << strncpy(currency_in, argv[1]+7, 3) << endl;
    currency_out[3] = '\0';

    cout << strncpy(currency_out, argv[2]+5, 3) << endl;
    currency_in[3] = '\0';

    cout << strncpy(sum_str, argv[3]+6, sizeof(argv[1]) - 5) << endl;
    sum = atoi(sum_str);

    cout << exchange(root_node, currency_in, currency_out, sum);

    return 0;
}