C# True False

<-- C# LiteralsInteger Literals -->
  • "true" and "false" are the only two boolean literal values in C#.
  • You cannot use True or FALSE as the boolean literal becauase C# is case sensitive language.
  • "true" or "false" can be assigned to any boolean variables.
  • The boolean data type in C# is bool not boolean or Boolean.

Example 01-17-01:

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using System;

namespace TestTrueFalse
{
    class Program
    {
        static void Main(string[] args)
        {
            bool isFolderExist = true;
            bool isFileExist = true;

            //isFolderExist = TRUE;
            //isFileExist = False;
            
            Console.WriteLine(isFolderExist && isFileExist ? "Existed" : "Not existed");
            
            isFileExist = false;
            Console.WriteLine(isFolderExist && isFileExist ? "Existed" : "Not existed");

            Console.Read();
        }
    }
}

Output

Existed
Not existed
  • Line 9-10: Define 2 boolean variables and assign true literal to them.
  • Line 15: Output the result. ?: operator is used to output the string based on the condition. Because they are all true, "Existed" is printed.
  • Line 17: This time literal false is assigned to isFileExist.
  • Line 18: Output "Not existed" because the condition is false.
  • Line 12-13: These 2 lines were commented out. If either of double slash were removed, you would get a compile-time error. Because either TRUE or False is not a boolean literal.
<-- C# LiteralsInteger Literals -->