C#

• Introduction
• Getting Output
• Datatype
• Variable Declaration
• Operator
• string concatenation
• Converting Datatype
• Getting input from user
• Working on Angles
• Escape Sequence
• Conditional Statements
• If statement
• Switch statement
• Types of Error
• Exception Handling
• Loop
• While Loop
• For Loop
• Do While Loop
• Array
• Foreach Loop
• Multi dimensional array
• Nested Loop
• Jump Statment
• String Handling Function
• Methods or Functions
• Passing Parameter
• Method Overloading
• Void Function
• Returning Function
• Class
• Creating New Instance
• Static Keyword
• Constructor
• Constructor Overloading
• Destructor
• Inheritance
• Multi Level Inheritance
• Multiple Inheritance
• Sealed Class
• Partial Class
• Upcasting
• Abstract Class
• Interface
• Ref,Out,In Parameters
• Field Vs Property
• Struct
• DateTime
• Enum
• Namespace
• Dynamic Link Library(DLL)
• Collections
• File Handling
• Excel handling

Nested loop

If a loop present inside another Loop, it is known as Nested Loop. In programming language, nesting of for, while, do-while and foreach loops are allowed and you can also put any nested loop inside any other type of loop like in a for loop you are allowed to put nested while loop. When it comes to Nested loop outer loop encloses the inner loop. The inner loop is a part of the outer loop and must start and finish within the body of outer loop. On each iteration of outer loop, the inner loop is executed completely.

Before studying Nested Loop, we need to be clear with loops. when it comes to Nested loop the most commonly used loop is For loop. So if you are not clear with the syntax, function of For loop take your time to revisit For Loop page.

Syntax
Outer-Loop
{
        // body of outer-loop
        Inner-Loop
        {
        // body of inner-loop
        }
}

NOTE
Once the inner loop was initiated, system will excute inner loop completely then move towards outer loop.

CODE

EG 1 . Creating 2 dimensional array called cricket players. Printing out all elements in console

static void Main(string[] args) {
    string[,] cricketPlayers = new string[2, 3];
    cricketPlayers[0, 0] = "Sachin";
    cricketPlayers[0, 1] = "Ramesh";
    cricketPlayers[0, 2] = "Tendulkar";
    cricketPlayers[1, 0] = "Mahendra";
    cricketPlayers[1, 1] = "Singh";
    cricketPlayers[1, 2] = "Dhoni";

    for (int i = 0;i < 2;i++) //To manage row
    {
        for (int j=0;j < 3;j++) //To manage column
        {
            Console.WriteLine(cricketPlayers[i,j]);
        }
    }
}

OUTPUT
Sachin
Ramesh
Tendulkar
Mahendra
Singh
Dhoni

CODE EXPLANATION
In the above code, We declared a 2 dimensional array with cricket players name. We already studied how memory allocation, naming, assigning of values will takes place in Multidimensional Array. First outer loop will be initiated, condition will be checked. If condition turns to true system will directly enter inside outer loop and execute whatever code we written inside. Inside outer loop we are having one more loop. so the inner loop will be initiated, where condition will be checked if that condition turns to true, system enter inside inner loop and whatever code we written inside will be executed. Currently we are having the values of i and j which is nothing but row and column. So that row index and column index value will be printed out in console. The most important thing what we need to keep in mind is System will never go to outer loop until inner loop executed completely. System will complete executing the inner loop before moving to outer loop and Operation will be repeated if the outer loop condition again turns to true.

Exercises
1. Write a program to get row value from user , print Right angle triangle shape using *
    sample output
    if user enter row value as 3
    *
    **
    ***

2. Write a program to get row value from user , print Triangle shape using *
    sample output
    if user enter row value as 3
      *
    ***
  *****

(Click Here, For more exercises)