Console Readline

harish reddy

9y1.7kLearn iOS Programming

Console.WriteLine("Input the length and breadth");

int a = 10;

Console.WriteLine("Lenght of the rectangle is" + " " + a );

Console.Writeline("Now enter the \"breadth\" of rectangle");

Console.ReadLine();

int b = int.Parse(Console.ReadLine());

int Perimeter = 4*(a*b);

int Area = a*b;

Console.WriteLine("The perimeter of rectangle is" + " "+ Perimeter);

Console.WriteLine("The area of rectangle is" + " " + Area);

First question :

In the above program if i comment out console.readline(); , then i am getting the output.

But, if i dont comment out console.readline();, then i am getting an exception error. Why?

second Question:

When the fourth line of code is executed i.e Console.Writeline("Now enter the \"breadth\" of rectangle"); i am getting a cursor mark to input the value from user. But the same cursor mark is not appearing where there are other console.writeline . Why?

Third question:

I have confusion when we use Console.readline(); What does this do?

7 Replies

Know the answer? Post it — somebody with the same question will find it here.

Khaja Moizuddin9y ago
Accepted answer
Console is blinking due to Console.ReadLine() , Console.WriteLine() is used for entering the given value and moving the cursor to the next line. But holding console or output window is based on ReadLine()
Vivek Kumar9y ago
Have a look into the below links for better understanding.

https://msdn.microsoft.com/en-us/library/system.console.readline(v=vs.110).aspx

https://www.dotnetperls.com/console-readline
harish reddy9y ago
Thanks for the explanation. But i have seen console.readline in between the class also. Not outside the class...Can you be little more clear . The main question what i have is "in the console window we have a cursor blinking right"? . whether the cursor is blinking based on the code of console.readline or console.writeline?
Khaja Moizuddin9y ago
Can you post your query in forums as i am on my mobile device , unable to open the zip
harish reddy9y ago
Pls check the attached file for the query on the same.

also there is a new program for which i have other question which is also put in the text file
Khaja Moizuddin9y ago
Using System ; Public Class Class1 { Void Main() { // Main Method Console.WriteLine("Input the length and breadth"); int a = 10; Console.WriteLine("Lenght of the rectangle is" + " " + a ); Console.Writeline("Now enter the \"breadth\" of rectangle"); int b = int.Parse(Console.ReadLine()); int Perimeter = 4*(a*b); int Area = a*b; Console.WriteLine("The perimeter of rectangle is" + " "+ Perimeter); Console.WriteLine("The area of rectangle is" + " " + Area); } // End of Main Method Console.ReadLine(); }// End of Class. Thus Console.ReadLine() should be outside the method., Otherwise you will get Exception.
Khaja Moizuddin9y ago
Actually the use of Console.ReadLine() is used for holding for output window and waiting for the input from the programmer , from the above program you have written the Console.ReadLine() should be in the last line of your program. The code will give you output with or without Console.ReadLine(); ,As you have used in middle of your program it throws the exception. Console.ReadLine() is used for holding output window that is command prompt window , if you doesn't use this then your program will be executing but you cant see the output properly or you will not be able to provide input from yourside.