DEV Community: Coder

Problem realted to condition and loop and pattern

Coder — Mon, 30 Dec 2024 14:16:43 +0000

1.Question
=> Find n is +ve,-ve or 0?
code:-

import 'dart:io';

void main() {
  print('Om Namah Shivay');
  int n = int.parse(stdin.readLineSync()!);
  if (n > 0) {
    print('$n is positive');
  } else if (n == 0) {
    print('$n is zero');
  } else {
    print('$n is positive');
  }
}

2.Question
=>which one is greater in a and b?
code:-

import 'dart:io';

void main() {
  print('Om Namah Shivay');
  print(greater());
}

int greater({int? a, int? b}) {
  a = int.parse(stdin.readLineSync()!);
  b = int.parse(stdin.readLineSync()!);
  if (a > b) {
    return a;
  } else {
    return b;
  }
}

3.Question
Find that the alphabet is in lowercase or uppercase?
code:-

void main() {
  print('Om Namah Shivay');
  print(Case(alpphabet: 'om'));
}

String Case({required String alpphabet}) {
  if (alpphabet == alpphabet.toUpperCase()) {
    return 'upperCase';
  } else {
    return 'lowerCase';
  }
}

loops
4.print 1 to n
code:-

void main() {
  print('Om Namah Shivay');
  number(n: 10);
}

void number({required int n}) {
  int i = 1;
  while (i <= n) {
    print(i);
    i++;
  }
}

5.print sum of 1 to n?

void main() {
  print('Om Namah Shivay');

  print(sum(n: 5));
}

int sum({required int n}) {
  int i = 1, sum = 0;

  while (i <= n) {
    sum += i;
    i++;
  }
  return sum;
}

6.Find sum of even numbers in 1 to n?

code:-

void main() {
  print('Om Namah Shivay');

  print(sum(n: 5));
}

int sum({required int n}) {
  int i = 1, sum = 0;

  while (i <= n) {
    i % 2 == 0 ? sum += i : sum += 0;

    i++;
  }
  return sum;
}

7.convert f to c(temp.)
code:-

void main() {
  print('Om Namah Shivay');

  print(celsiusConvertor(f: 5.23));
}

double celsiusConvertor({required double f}) {
  return (f - 32) * 5 / 9;
}

8.n is prime or not?

code:-

void main() {
  print('Om Namah Shivay');

  print(prime(n: 56));
}

String prime({required double n}) {
  int i = 2;
  String ans = 'prime';
  while (i < n) {
    if (n % i == 0) {
      ans = 'non-prime';
      break;
    }
  }
  return ans;
}

9.Make this pattern

code:-

void main() {
  print('Om Namah Shivay');

  print(pattern());
}

String pattern() {
  int i = 1;
  String star = '*';
  while (i <= 3) {
    print(star * 4);
    i++;
  }
  return '';
}

10.Make this pattern

111
222
333

code:-

void main() {
  print('Om Namah Shivay');

  print(pattern());
}

String pattern() {
  int i = 1;
  while (i <= 3) {
    String star = i.toString();

    print(star * 3);
    i++;
  }
  return '';
}

I understood

Button in Flutter

Coder — Mon, 30 Dec 2024 11:41:19 +0000

code:-

import 'package:flutter/material.dart';

void main() {
  runApp(om());
}

class om extends StatefulWidget {
  const om({super.key});

  @override
  State<om> createState() => _omState();
}

class _omState extends State<om> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      darkTheme: ThemeData.dark(),
      title: 'Om Namah Shivay',
      home: Scaffold(
        appBar: AppBar(
          centerTitle: true,
          backgroundColor: Colors.red,
          title: Text(
            'Button',
            style: TextStyle(color: Colors.black),
          ),
        ),
        body: Center(
          child: ElevatedButton(
              style: ButtonStyle(
                  fixedSize: WidgetStatePropertyAll(Size(100, 100)),
                  shape: WidgetStatePropertyAll(RoundedRectangleBorder(
                      side: BorderSide(color: Colors.white, width: 3),
                      borderRadius: BorderRadius.only(
                          topLeft: Radius.circular(50),
                          bottomRight: Radius.circular(50)))),
                  elevation: WidgetStatePropertyAll(5.0),
                  backgroundColor: WidgetStatePropertyAll(Colors.red)),
              onPressed: () {},
              child: Text(
                'Click',
                style: TextStyle(color: Colors.black),
              )),
        ),
      ),
    );
  }
}

I understood

Wrap in Flutter

Coder — Mon, 30 Dec 2024 11:24:19 +0000

import 'package:flutter/material.dart';

void main() {
  runApp(const om());
}

class om extends StatefulWidget {
  const om({super.key});

  @override
  State<om> createState() => _omState();
}

class _omState extends State<om> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      darkTheme: ThemeData.dark(),
      debugShowCheckedModeBanner: false,
      title: 'Om Namah Shivay',
      home: Scaffold(
        appBar: AppBar(
          title: Text(
            "Rows and Columns and wrap",
            style: TextStyle(color: Colors.black),
          ),
          centerTitle: true,
          backgroundColor: Colors.red,
        ),
        body: Wrap(
          alignment: WrapAlignment.center,
          direction: Axis.vertical,
          children: [
            Container(
              margin: EdgeInsets.all(15),
              color: Colors.red,
              width: 50,
              height: 50,
            ),
            Container(
              margin: EdgeInsets.all(15),
              color: Colors.red,
              width: 50,
              height: 50,
            ),
            Container(
              margin: EdgeInsets.all(15),
              color: Colors.red,
              width: 50,
              height: 50,
            ),
            Container(
              margin: EdgeInsets.all(15),
              color: Colors.red,
              width: 50,
              height: 50,
            ),
            Container(
              margin: EdgeInsets.all(15),
              color: Colors.red,
              width: 50,
              height: 50,
            ),
            Container(
              margin: EdgeInsets.all(15),
              color: Colors.red,
              width: 50,
              height: 50,
            ),
            Container(
              margin: EdgeInsets.all(15),
              color: Colors.red,
              width: 50,
              height: 50,
            ),
            Container(
              margin: EdgeInsets.all(15),
              color: Colors.red,
              width: 50,
              height: 50,
            ),
            Container(
              margin: EdgeInsets.all(15),
              color: Colors.red,
              width: 50,
              height: 50,
            ),
            Container(
              margin: EdgeInsets.all(15),
              color: Colors.red,
              width: 50,
              height: 50,
            ),
          ],
        ),
      ),
    );
  }
}

I understood

Container in Flutter

Coder — Mon, 30 Dec 2024 09:31:43 +0000

code:-

import 'package:flutter/material.dart';

void main() {
  runApp(om());
}

class om extends StatelessWidget {
  const om({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      darkTheme: ThemeData.dark(),
      title: 'Om Namah Shivay',
      home: Scaffold(
        appBar: AppBar(
          title: Text(
            'Container',
            style: TextStyle(color: Colors.black, fontStyle: FontStyle.italic),
          ),
          centerTitle: true,
          backgroundColor: Colors.red,
        ),

        ///body
        body: Center(
          child: Container(
            decoration: BoxDecoration(
                boxShadow: [
                  BoxShadow(
                      color: Colors.white,
                      spreadRadius: 2,
                      blurRadius: 15,
                      offset: Offset(0, 15)),
                  BoxShadow(
                      color: Colors.white,
                      spreadRadius: 2,
                      blurRadius: 15,
                      offset: Offset(15, 0)),
                  BoxShadow(
                      color: Colors.red,
                      spreadRadius: 2,
                      blurRadius: 15,
                      offset: Offset(0, -15)),
                  BoxShadow(
                      color: Colors.red,
                      spreadRadius: 2,
                      blurRadius: 15,
                      offset: Offset(-15, 0)),
                ],
                gradient: LinearGradient(colors: [Colors.red, Colors.orange]),
                borderRadius: BorderRadius.only(
                    topRight: Radius.circular(10),
                    bottomLeft: Radius.circular(10),
                    topLeft: Radius.circular(80)),
                border: Border.all(color: Colors.white, width: 3)),
            alignment: Alignment.center,
            height: 300,
            width: 300,
            child: Text(
              '||ऊँ नम: शिवाय ||',
              style: TextStyle(color: Colors.white, fontSize: 25),
            ),
          ),
        ),
      ),
    );
  }
}

I understood

Class in dart

Coder — Mon, 30 Dec 2024 07:19:42 +0000

void main() {
  print('Om Namah Shivay');

  Roti roti = Roti(heatReguired: 50.0, name: 'wheat', water: 26.23);
  print(roti.process());
}
//class
class ingredient {
  late String name;
  late double water;
  ingredient({required this.name, required this.water});
}

class Roti extends ingredient {
  late double heatReguired;
  Roti({required this.heatReguired, required super.name, required super.water});

  String process() {
    return '$heatReguired is the heat needed for making roti that take $name and $water water';
  }
}

I understood

Function in dart

Coder — Mon, 30 Dec 2024 06:55:39 +0000

void main() {
  print('Om Namah Shivay');
  print(info(age: 16));
}
//function
String info({String? name, required int age}) {
  return "my name is ${name != null ? name : 'XYZ'} and  i am $age year old";
}

I understood

Map in Dart

Coder — Mon, 30 Dec 2024 06:39:00 +0000

void main() {
  print('Om Namah Shivay');
//Map
  Map<int, String> planetOrder = {
    1: 'mercury',
    2: 'venus',
    3: 'earth',
    4: 'mars',
    5: 'jupiter',
    6: 'uranus',
    7: 'neptune',
    8: 'pluto',
  };

  //remove pluto
  planetOrder.remove(8);
  print(planetOrder);
}

I understood

List in Dart

Coder — Mon, 30 Dec 2024 05:48:53 +0000

void main() {
  print('Om Namah Shivay');
//list
  List<int> ages = [1, 2, 3, 4, 5, 6, 7, 5, 4, 2];
  ages.remove(2);
  ages[5] = 45;

  print(ages.length);
  print(ages);
}

I understood

Loop

Coder — Mon, 30 Dec 2024 05:36:38 +0000

void main() {
  print('Om Namah Shivay');
//loops
//1.for loop
  for (var i = 1; i <= 10; i++) {
    String ans = 'even';
    print('$i  is ${i % 2 == 0 ? ans = 'even' : ans = 'odd'}');
  }

  //2.while loop
  int j = 1;
  while (j <= 10) {
    if (j % 2 == 0) {
      print('$j is even');
    } else {
      print('$j is odd');
    }
    j++;
  }
}

I understood

Ternary operater

Coder — Mon, 30 Dec 2024 04:33:12 +0000

void main() {
  print('Om Namah Shivay');
//ternary
  int age = 16;
  print(age == 16 ? 'age = 16' : 'invalid');
}

I understood

Nested if-else

Coder — Mon, 30 Dec 2024 04:29:07 +0000

void main() {
  print('Om Namah Shivay');
  //   nested if -else
  int age = 16;
  if (age == 15) {
    print('age = 15');
  } else if (age == 16) {
    print('age = 16');
  } else {
    print('That person neither born  nor die.');
  }
}

I understood

Switch Case

Coder — Mon, 30 Dec 2024 04:18:49 +0000

void main() {
  print('Om Namah Shivay');
  //switch 
  int age = 16;
  switch (age) {
    case 15:
      print('age = 15');

      break;
    case 16:
      print('age = 16');
    default:
      print('That person neither born  nor die.');
  }
}

I understood