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09-12-2010



Console is a pre-defined class it has various members methods among them two are important.

1. WritLine(): This method will print the given value on command prompt window after printing the value it will move the cursor to next line.

2. ReadLine(): This method will accept input from the user until user will press an enter key.

This method return type is string that means this method will treate th e user input as an string.

Eg: To print name and age:


    void main(--)
         {
            Console.WriteLine("Enter your name");
            string name = Console.ReadLine();
            Console.WriteLine("Your name is " +name);
            Console.WriteLine("Enter your age");
            string age =Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Your age is " +age);
            Console.ReadLine();
         }
Output: Enter your name
              Sathya
              Your name is Sathya  
              Enter your age
              16
              Your age is 16

Convert Class: Convert is apre-defined class this class will have various data type conversion methods.

ToInt32(): It is a member of convert class. This method will convert the given value from any data type to int data type.

    Class Convert
      {
         ToInt32()
      }


Eg:
    void main()
       {
        Console.WriteLine("Enter Employee number");
        int empno  = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("Enter employee name");
        string ename = console.ReadLine();

        Console.WriteLine("Enter Salary");
        int sal = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("Employee number is " +empno);
        Console.WriteLine("Employee name is " +ename);
        Console.WriteLine("Employee salary is " +sal);

        Console.ReadLine()
      }
Output: Enter Employee number
              111
              Enter employee name
              John
              Enter salary
              1000
              Employee number is 111
              Employee name is John
              Employee salary is 1000

Conditional Statements: Whenever we want to execute a single statement or a block of statement based on some conditions we will go for conditional statements.

Conditional statements are of two types:
    1. If condition
    2. Switch condition

    
1. If condition: If condition we can implement in 3 ways:

a. if:
    Syntax: if(<condtion>)
        {
          statement 1;
          statement 2;
                  |
                  |
          statement n;
        }

If condition is true then control will execute the statement 1 & statement 2 & so on..after that it will execute the following statements.

If the condition is false control will skip the statement 1 & statement 2 and so on.., after that it will execute the following statements.

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