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C# - Example of Nested if else Statement

C# nested if else statement example: Here, we are writing a C# - Example of Nested if else Statement.
Submitted by IncludeHelp, on April 07, 2019 [Last updated : March 17, 2023]

Nested if else Statement

Like other programming languages, in C# also conditions may be checked within a condition, i.e. nested if-else allows us to check other conditions within if or else block.

Syntax

if(test_condition1){
	//code section 1
	if(test_condition_a){
		//code section a
}
else{
	//code section b
}
}
else if(test_condition2){
{
	//code section 2
}
else if(test_condition3){
	//code section 3
}
...
else{
	//else code section
}

See the syntax above, here we are checking test_condition_a within the test_conditon1 block, if test_condition1 will be true, "code section a" will be executed.

C# program to demonstrate the example of nested if else statement

Here, we are asking for a character – and check whether it is vowel or consonant, if input character is a valid alphabet

// C# program to demonstrate example of 
// nested if else statement 

using System;
using System.IO;
using System.Text;

namespace IncludeHelp {
  class Test {
    // Main Method 
    static void Main(string[] args) {
      //input a character and check whether it is vowel or consonant 
      //but before it - check input character is an aplhabet or not
      char ch;
      Console.Write("Enter a character: ");
      ch = Console.ReadLine()[0];

      //check ch is an alphabet or not
      if ((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z')) {
        Console.WriteLine("{0} is a valid alphabet", ch);
        //checking for vowel or consonant
        if (ch == 'A' || ch == 'a' || ch == 'E' || ch == 'e' ||
          ch == 'I' || ch == 'i' || ch == 'O' || ch == 'o' ||
          ch == 'U' || ch == 'u') {
          Console.WriteLine("{0} is a vowel", ch);
        } else {
          Console.WriteLine("{0} is a consonant", ch);
        }
      } else {
        Console.WriteLine("{0} is not a valid alphabet", ch);
      }

      //hit ENTER to exit the program
      Console.ReadLine();
    }
  }
}

Output

First run:
Enter a character: X
X is a valid alphabet
X is a consonant

Second run:
Enter a character: u
u is a valid alphabet
u is a vowel

Third run:
Enter a character: $
$ is not a valid alphabet

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