.Net Controlling Program Flow Statements
- 1. Dr.A.Bharathi Lakshmi, Head and Assistant Professor of IT, V.V.Vanniaperumal College for Women, Virudhunagar.
- 2. Controlling Program Flow • Decision statements Execute stmts. based on the condition If…Then If…Then…Else If…Then..ElseIf..Else Select…Case • Looping Statement Set of statements will be executed repeatedly until a specific condition While…End While Do…Loop For…Next For…Each…Next
- 3. Decision Statements If…Then • To execute a block of code based on a certain condition Syntax If <<condition>> Then ‘Statements to be executed End If
- 4. Decision Statements If…Then…Else • Same as If…Then • Two blocks of code can be executed for true case as well as for false case Syntax If <<condition>> Then ‘Execute Statements if condition is true Else ‘Execute Statements if condition is false End If
- 5. Decision Statements If…Then…Elseif • Same as If…Then • Multiple blocks of code can be executed for true case as well as for false case Syntax If <<condition1>> Then ‘Execute Statements if condition is true Else If <<condition2>> Then ‘Execute Statements if condition2 is true . . . Else ‘Execute Statements if all the conditions are false End If
- 6. Decision Statements Select…Case Statement • Execute a group of statements based on the test expression • Can be a single variable or complex expression Syntax Select <<testvalue>> ‘Execute a set of statements Case <<value1>> ‘Execute a set of statements Case <<value2>> ‘Execute a set of statements Case <<value3>> ‘Execute a set of statements Case Else ‘Execute a set of statements End Select
- 7. Looping Statements While…End While • Set of statements will be executed until the condition becomes false. Syntax While <<condition>> ‘Executes statements End While
- 8. Looping Statements Do…Loop • Same as while loop • Executes the block of code first without evaluating the condition • Then the condition is evaluated Syntax do ‘Executes statements Loop While <<condition>>
- 9. Looping Statements For…Next Statement • Same as while…end while • Block of code will be executed for a fixed number of times. Syntax For <<varnam>>=<<start>> to <<end>> Step <<value>> ‘Executes statements Next
- 10. Looping Statements For…Each…Next Statement • Similar to For...Next statement • Enables to traverse through a collection such as an array or a row of a table. Syntax For each <<varnam>> In <<array name or collection>> ‘Executes statements Next Examples Dim I as integer For Each I in Arrnam Console.WriteLine(arrnam(i)) Next