C# program to demonstrate an example of nested if-else statement


     //code section 1
     //code section a
     //code section b
    else if(test_condition2){
     //code section 2
    else if(test_condition3){
     //code section 3
     //else code section

C# example for nested if-else statement:

// C# program to demonstrate example of 
// nested if else statement 
using System;
using System.IO;
using System.Text;

namespace JustTechReview
    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);
                    Console.WriteLine("{0} is a consonant", ch);
                Console.WriteLine("{0} is not a valid alphabet",ch);
            //hit ENTER to exit the program


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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