test.dart

    /**
     * print a number
     * "helo"
     * 'string'
     */

    int printNum(int anum) {
        print("This is a $anum\n");
        print('This is a $anum\n \'world\'');
        if (anum == 1) {
            return 1;
        } else {
            return 2;
        }
    }

    // What are you doing?
    void main() {
        int nn = 10;
        bool boolean = true;
        printNum(nn);
    }