Conditional statements are used where your program must evaluate whether a logical statement is true or false. These include, but are not limited to:

IF-THEN-ELSE

General form:

IF(CONDITION evaluates to TRUE) THEN
DO SOMETHING
ELSE
DO SOMETHING ELSE

• C/C++ / C#.NET / Java

  if(x==1)
  {
     // do something
  }
  else
  {
     // do something else
  }

• VisualBasic.NET

  If foo = bar Then
     ' do something
  Else
     ' do something else
  End If

WHILE, DO-WHILE, and DO-UNTIL loops

General form:

WHILE(CONDITION evaluates to TRUE)
DO SOMETHING
LOOP

DO
SOMETHING
WHILE(CONDITION evaluates to TRUE)

DO
SOMETHING
UNTIL(CONDITION evaluates to TRUE)

• C/C++ / C#.NET / Java

  while(choice != 'x')
  {
     // do something
  }
  
  do
  {
     // do something
  }while(choice != 'x')
  
  do
  {
     // do something
  }while(choice == 'x')

• VisualBasic.NET

  While repeat = True
  ' do something
  End While
  
  Do While repeat = True
  ' do something
  Loop
  
  Do Until repeat = False
  ' do something
  Loop

FOR and FOREACH loops

General form:

FOR(ITERATOR; CONDITION; INCREMENTOR)
DO SOMETHING

FOREACH(ELEMENT in COLLECTION)
DO SOMETHING

• C/C++

  for(int i=0; i<0; i++)
  {
     // do something
  }
  
  for each(Control ctrl in this.MainForm.Controls)
  {
     // do something
  }

• C#.NET

  int x = 10;
  
  for(int i=0; i=< x; i++)
  {
     // do something
  }
  
  foreach (Control ctrl in this.Controls)
  {
     // do something
  }

• Java

  int x = 10;
  
  for(int i=0; i=< x; i++)
  {
     // do something
  }
  
  for (Control ctrl : this.Controls)
  {
     // do something
  }

• VisualBasic.NET

  For Each ctrl As Control In Me.MainForm.Controls
     ' do something
  Next ctrl

SWITCH or SELECT CASE statements

General form:

SWITCH (COMPARITOR)
CASE (VALUE1):
    DO SOMETHING
    BREAK
CASE (VALUE2):
    DO SOMETHING
    BREAK
CASE (DEFAULT VALUE):
    DO SOMETHING
    BREAK
END SWITCH

• C/C++ / C#.NET / Java

  switch(rdb.Name)
  {
  case button1:
     // do something
     break;
  case button2:
     // do something
     break;
  default:
      // do something
      break;
  }

• VisualBasic.NET

  Select Case option
  Case 0
  ' do something
  Case 1
  ' do something
  Case Else
  ' do something
  End Select