33 lines
803 B
C++
33 lines
803 B
C++
#include <QApplication>
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#include <QFileDialog>
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#include <QFile>
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#include <QTextStream>
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#include <QDebug>
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#include <iostream>
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int main(int argc, char *argv[]) {
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QApplication app(argc, argv);
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QUrl url = QFileDialog::getOpenFileUrl(nullptr, "Select File", QUrl(), "All Files (*.*)");
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if (!url.isValid() || !url.isLocalFile()) return 1;
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QFile file(url.toLocalFile());
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if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
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std::cerr << "Failed to open file" << std::endl;
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return 1;
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}
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QTextStream in(&file);
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QString line = in.readLine();
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bool ok;
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int number = line.toInt(&ok);
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if (!ok) {
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std::cerr << "Failed to read integer from file" << std::endl;
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return 1;
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}
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std::cout << number * 2 << std::endl;
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return 0;
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}
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