one4all.dart

import 'dart:io';
import 'dart:math';

void main() {
  List<String> list = <String>['k'];
  stdout.writeln('choose operation: 1 - k^3; 2 - k^3 oct; 3 - sqrt(k)');
  String? op = stdin.readLineSync();
  String? nxt;
  int defgap1 = 0;
  StringBuffer gap1 = StringBuffer();
  StringBuffer gap2 = StringBuffer();

  if (op == '1') {
    list.add('k*k*k');
    stdout.writeln('input number');
    nxt = stdin.readLineSync();

    while (nxt != 'stop') {
      if (nxt != null) {
        list.add(nxt);
        int k = int.parse(nxt);
        k = k * k * k;
        nxt = k.toString();
        list.add(nxt);
        stdout.writeln("input another number or 'stop'");
        nxt = stdin.readLineSync();
      }
    }
  } else if (op == '2') {
    list.add('k*k*k[8]');
    stdout.writeln('input number');
    nxt = stdin.readLineSync();

    while (nxt != 'stop') {
      if (nxt != null) {
        list.add(nxt);
        int k = int.parse(nxt);
        k = k * k * k;
        nxt = k.toRadixString(8);
        list.add(nxt);
        stdout.writeln("input another number or 'stop'");
        nxt = stdin.readLineSync();
      }
    }
  } else {
    list.add('sqrt(k)');
    stdout.writeln('input number');
    nxt = stdin.readLineSync();

    while (nxt != 'stop') {
      if (nxt != null) {
        list.add(nxt);
        int k = int.parse(nxt);
        nxt = sqrt(k).toStringAsFixed(6);
        list.add(nxt);
        stdout.writeln("input another number or 'stop'");
        nxt = stdin.readLineSync();
      }
    }
  }

  for (int i = 0; i < list.length; i = i + 2) {
    if (defgap1 < list[i].length) {
      defgap1 = list[i].length;
    }
  }

  //print(list);

  stdout.writeln('alignment: 1 - to the left, 2 - to the right');
  String? w = stdin.readLineSync();

  if (w == '1') {
    for (int i = 0; i < list.length; i = i + 2) {
      for (int j = 0; j <= (5 * defgap1) - list[i].length; j++) {
        gap1.write(' ');
      }
      print(list[i] + gap1.toString() + list[i + 1]);
      gap1.clear();
    }
  } else {
    int defgap2 = 0;
    for (int i = 1; i <= list.length; i = i + 2) {
      if (defgap2 < list[i].length) {
        defgap2 = list[i].length;
      }
    }

    for (int i = 0; i < list.length; i = i + 2) {
      for (int j = 0; j < defgap1 - list[i].length; j++) {
        gap1.write(' ');
      }
      for (int j = 0; j < (2 * defgap2) - list[i + 1].length; j++) {
        gap2.write(' ');
      }

      print(gap1.toString() + list[i] + gap2.toString() + list[i + 1]);
      gap1.clear();
      gap2.clear();
    }
  }
}