Sr.No. | Statement & Description |
---|---|
1 | An if statement consists of a boolean expression followed by one or more statements. |
2 | An if statement can be followed by an optional else statement, which executes when the boolean expression is false. |
3 | You can use one if or else if statement inside another if or else ifstatement(s). |
4 | A switch statement allows a variable to be tested for equality against a list of values. |
5 | You can use one switch statement inside another switchstatement(s). |
if(boolean_expression) { /* statement(s) will execute if the boolean expression is true */ }If the boolean expression evaluates to true, then the block of code inside the if statement is executed. If boolean expression evaluates to false, then the first set of code after the end of the if statement(after the closing curly brace) is executed.
using System; namespace DecisionMaking { class Program { static void Main(string[] args) { /* local variable definition */ int a = 10; /* check the boolean condition using if statement */ if (a < 20) { /* if condition is true then print the following */ Console.WriteLine("a is less than 20"); } Console.WriteLine("value of a is : {0}", a); Console.ReadLine(); } } }When the above code is compiled and executed, it produces the following result −
a is less than 20; value of a is : 10
if(boolean_expression) { /* statement(s) will execute if the boolean expression is true */ } else { /* statement(s) will execute if the boolean expression is false */ }If the boolean expression evaluates to true, then the if block of code is executed, otherwise else block of code is executed.
using System; namespace DecisionMaking { class Program { static void Main(string[] args) { /* local variable definition */ int a = 100; /* check the boolean condition */ if (a < 20) { /* if condition is true then print the following */ Console.WriteLine("a is less than 20"); } else { /* if condition is false then print the following */ Console.WriteLine("a is not less than 20"); } Console.WriteLine("value of a is : {0}", a); Console.ReadLine(); } } }When the above code is compiled and executed, it produces the following result −
a is not less than 20; value of a is : 100
if(boolean_expression 1) { /* Executes when the boolean expression 1 is true */ } else if( boolean_expression 2) { /* Executes when the boolean expression 2 is true */ } else if( boolean_expression 3) { /* Executes when the boolean expression 3 is true */ } else { /* executes when the none of the above condition is true */ }
using System; namespace DecisionMaking { class Program { static void Main(string[] args) { /* local variable definition */ int a = 100; /* check the boolean condition */ if (a == 10) { /* if condition is true then print the following */ Console.WriteLine("Value of a is 10"); } else if (a == 20) { /* if else if condition is true */ Console.WriteLine("Value of a is 20"); } else if (a == 30) { /* if else if condition is true */ Console.WriteLine("Value of a is 30"); } else { /* if none of the conditions is true */ Console.WriteLine("None of the values is matching"); } Console.WriteLine("Exact value of a is: {0}", a); Console.ReadLine(); } } }When the above code is compiled and executed, it produces the following result −
None of the values is matching Exact value of a is: 100
switch(expression) { case constant-expression1 : statement(s); break; case constant-expression2 : case constant-expression3 : statement(s); break; /* you can have any number of case statements */ default : /* Optional */ statement(s); }The following rules apply to a switch statement −
using System; namespace DecisionMaking { class Program { static void Main(string[] args) { /* local variable definition */ char grade = 'B'; switch (grade) { case 'A': Console.WriteLine("Excellent!"); break; case 'B': case 'C': Console.WriteLine("Well done"); break; case 'D': Console.WriteLine("You passed"); break; case 'F': Console.WriteLine("Better try again"); break; default: Console.WriteLine("Invalid grade"); break; } Console.WriteLine("Your grade is {0}", grade); Console.ReadLine(); } } }When the above code is compiled and executed, it produces the following result −
Well done Your grade is B
Exp1 ? Exp2 : Exp3;Where Exp1, Exp2, and Exp3 are expressions. Notice the use and placement of the colon. The value of a ? expression is determined as follows: Exp1 is evaluated. If it is true, then Exp2 is evaluated and becomes the value of the entire ? expression. If Exp1 is false, then Exp3 is evaluated and its value becomes the value of the expression.
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