using System;  // Importa o namespace System para permitir o uso de funcionalidades como entrada e saída de dados

class Program
{
    static void Main()  // Método principal que é o ponto de entrada do programa
    {
        // Array de números ordenados para testar a busca binária
        int[] numerosOrdenados = { 3, 6, 8, 12, 15, 18, 21 };  // Array fixo e ordenado para busca
        int valorProcurado = 15;  // Valor que queremos encontrar no array

        // Chama a função BuscaBinaria para procurar o valor no array
        int indice = BuscaBinaria(numerosOrdenados, valorProcurado);

        // Exibe o resultado da busca
        Console.WriteLine(indice != -1 ? $"Número encontrado no índice {indice}!" : "Número não encontrado. Talvez esteja em outra galáxia.");
    }

    // Função que realiza a busca binária para encontrar um valor em um array ordenado
    static int BuscaBinaria(int[] array, int valorProcurado)
    {
        int minimo = 0;  // Índice inicial do array
        int maximo = array.Length - 1;  // Último índice do array

        // Continua a busca enquanto a faixa de valores for válida
        while (minimo <= maximo)
        {
            int meio = (minimo + maximo) / 2;  // Calcula o índice do elemento do meio

            if (array[meio] == valorProcurado)  // Se o valor for encontrado, retorna o índice
                return meio; // Encontrado!
            else if (array[meio] < valorProcurado)  // Se o valor procurado for maior, ignora a metade inferior
                minimo = meio + 1;
            else  // Se o valor procurado for menor, ignora a metade superior
                maximo = meio - 1;
        }
        return -1;  // Retorna -1 se o valor não for encontrado
    }
}
by

C Sharp Online Compiler

Write, Run & Share C# code online using OneCompiler's C# online compiler for free. It's one of the robust, feature-rich online compilers for C# language, running on the latest version 8.0. Getting started with the OneCompiler's C# compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C# and start coding.

Read inputs from stdin

OneCompiler's C# online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

using System;
 
namespace Sample
{
  class Test
    {
      public static void Main(string[] args)
       {
         string name;
         name = Console.ReadLine();
         Console.WriteLine("Hello {0} ", name);
	}
     }
}

About C Sharp

C# is a general purpose object-oriented programming language by Microsoft. Though initially it was developed as part of .net but later it was approved by ECMA and ISO standards.

You can use C# to create variety of applications, like web, windows, mobile, console applications and much more using Visual studio.

Syntax help

Data types

Data TypeDescriptionRangesize
intTo store integers-2,147,483,648 to 2,147,483,6474 bytes
doubleto store large floating point numbers with decimalscan store 15 decimal digits8 bytes
floatto store floating point numbers with decimalscan store upto 7 decimal digits4 bytes
charto store single characters-2 bytes
stringto stores text-2 bytes per character
boolto stores either true or false-1 bit

Variables

Syntax

datatype variable-name = value;

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition or set of few conditions IF-ELSE is used.

if(conditional-expression) {
   // code
} 
else {
   // code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression) {    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
...    
    
default:     
 // code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement) {
  // code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while(condition) {
 // code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {
  // code 
} while (condition);

Arrays

Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.

Syntax

data-type[] array-name;

Methods

Method is a set of statements which gets executed only when they are called. Call the method name in the main function to execute the method.

Syntax

static void method-name() 
{
  // code to be executed
}