What are the differences between if else and else if

Question

I am trying to discern the difference between   if  else  else if    When do you use them and when not   I have a homework assignment with a ton of instances and I am running into code error due to not knowing the differences between each   Can someone please define how to use these

User · Answer

The if statement uses the results of a logical expression to decide if one of two code blocks will be executed.

With this code

if (logical expression) {
    code block 1;
} else {
    code block 2;
}

if the logical expression is true, only the statements in code block 1 will be executed; if false, only the statements in code block 2.

In the case that there are multiple similar tests to be done (for instance if we are testing a number to be less than zero, equal to zero or more than zero) then the second test can be placed as the first statement of the else code block.

if (logical expression 1) {
    code block 1;
} else {
    if (logical expression 2) {
        code block 2;
    } else {
        code block 3;
    }
}

In this case, code block 1 is executed if logical expression 1 is true; code block 2 if logical expression 1 is false and logical expression 2 is true; code block 3 if both logical expressions are false.

Obviously this can be repeated with another if statement as the first statement of code block 3.

The else if statement is simply a reformatted version of this code.

if (logical expression 1) {
    code block 1;
} else if (logical expression 2) {
    code block 2;
} else {
    code block 3;
}

User · Answer

The else if can be used in conjunction with  if   and  else  to further break down the logic    if less than zero if  myInt  lt  0           do something  else if  myInt  gt  0  amp  amp  myInt  lt  10     else if between 0 and 10               do something  else    else all others           do something

User · Answer

if  numOptions    1      return  if   else if  numOptions  gt  2      return  else if   else      return  else

User · Answer

Those are the basic decision orders that you have in most of the programming language  it helps you to decide the flow of actions that your program is gonna do  The if is telling the compiler that you have a question  and the question is the condition between parenthesis  if  condition        thingsToDo         the else part is an addition to this structure to tell the compiler what to do if the condition is false  if  condition        thingsToDo       else       thingsToDoInOtherCase         you can combine those to form a else if which is when the first condition is false but you want to do another question before to decide what to do   if  condition        thingsToDo       else if  condition2        thingsToDoInTheSecondCase      else       thingsToDoInOtherCase

User · Answer

What the if says      Whether I m true or not  always check other conditions too    What the else if says      Only check other conditions if i wasn t true

User · Answer

I think it helps to think of the  else  as the word OTHERWISE   so you would read it like this   if  something is true          do stuff   otherwise if  some other thing is true          do some stuff   otherwise         do some other stuff

User · Answer

IF   you are confused  read the c  spec   ELSE IF   you are kind of confused  read some books   ELSE    everything should be OK

User · Answer

If and else if both are used to test the conditions   I take case of If and else    In the if case compiler check all cases Wether it is true or false  if no one block execute then else part will be executed   in the case of else if compiler stop the flow of program when it got false value   it does not read whole program So better performance we use else if   But both have their importance according to situation  i take example of foor ordering menu if i use else if then it will suit well  because user can check only one also  and it will give  error  so i use if here     StringBuilder result new StringBuilder                  result append  Selected Items                   if pizza isChecked                       result append   nPizza 100Rs                      totalamount  100                                if coffe isChecked                       result append   nCoffe 50Rs                      totalamount  50                                if burger isChecked                       result append   nBurger 120Rs                      totalamount  120                                result append   nTotal    totalamount  Rs                    Displaying the message on the toast               Toast makeText getApplicationContext    result toString    Toast LENGTH LONG  show                   now else if case  if  time  lt  12        greeting    Good morning     else if  time  lt  22        greeting    Good day     else       greeting    Good evening       here only satisfy one condition   and in case of if multiple conditions can be satisfied

User · Answer

Dead Simple Pseudo-Code Explanation      If Example    if condition is true      do this   now do this regardless of whether condition was true or false      If-Else Example     if condition is true       do this  else      do this if condition was false   now do this regardless of whether condition was true or false     If-ElseIf-Else Example    if condition is true       do this  else if different condition is true       do this only if first condition was false and different condition was true  else      do this only if neither condition was true   now do this regardless of whether condition was true or false

User · Answer

If  else and else if are all constructs to help  branch  code   Basically  you employ them whenever you want to make a decision   An example would be  if it s sunny  I ll go outside   otherwise  I ll stay inside   In code  ignoring the extra stuff   if  sunny      goOutside      else     stayInside        You CAN use  else if  statements if you want to add  additional  conditions   Extending the previous example   if it s sunny  I ll go outside   If it s stormy  I ll go into the basement otherwise I ll stay inside   In code  if  sunny      goOutside      else if  stormy      goDownstairs      else     stayInside        EDIT section   Here is how you can write multiple ifs as and conditions   The following example can be written in at least two ways    If it s sunny and warm  go outside   If it s sunny and cold  do nothing   if  sunny       if  warm         goOutside            else if  cold         doNothing             OR  if  sunny  amp  amp  warm       goOutside      else if  sunny  amp  amp  cold       doNothing

User · Answer

An if statement follows this sort of structure   if  condition           executed only if  condition  is true   else if  other condition           executed only if  condition  was false and  other condition  is true   else          executed only if both  condition  and  other condition  were false     The if portion is the only block that is absolutely mandatory  else if allows you to say  ok  if the previous condition was not true  then if this condition is true      The else says  if none of the conditions above were true      You can have multiple else if blocks  but only one if block and only one  or zero  else blocks

User · Answer

The syntax of if statement is  if condition      something     executed  when condition is true else     otherthing     otherwise this part is executed   So  basically  else is a part of if construct  something and otherthing are often compound statements enclosed in    and else part is  in fact  optional   And else if is a combination of two ifs  where otherthing is an if itself   if condition1      something  else if condition2      otherthing  else     totallydifferenthing

User · Answer

There s no  else if   You have the following   if  condition      statement or block   Or   if  condition      statement or block else     statement or block   In the first case  the statement or block is executed if the condition is true  different than 0   In the second case  if the condition is true  the first statement or block is executed  otherwise the second statement or block is executed   So  when you write  else if   that s an  else statement   where the second statement is an if statement  You might have problems if you try to do this   if  condition      if  condition          statement or block else     statement or block   The problem here being you want the  else  to refer to the first  if   but you are actually referring to the second one  You fix this by doing   if  condition        if  condition          statement or block   else     statement or block

User · Answer

They mean exactly what they mean in English   IF a condition is true  do something  ELSE  otherwise  IF another condition is true  do something  ELSE do this when all else fails   Note that there is no else if construct specifically  just if and else  but the syntax allows you to place else and if together  and the convention is not to nest them deeper when you do  For example   if  x               else if  y               else               Is syntactically identical to   if  x               else        if  y                               else                             The syntax in both cases is   if   lt statment statment-block gt   else   lt statment statment-block gt     and if is itself a statment  so that syntax alone supports the use of else if

User · Answer

If-elseif-else can be written as a nested if-else   These are  logically speaking  equivalent   if  A         doA      else if  B        doB      else if  C        doC      else       doX        is the same as   if  A         doA      else       if  B                doB              else                if  C                          doC                        else                         doX                         The result is that ultimately only one of doA  doB  doC  or doX will be evaluated

User · Answer

if  condition      thingsToDo        else if  condition2      thingsToDoInTheSecondCase       else     thingsToDoInOtherCase

User · Answer

you can think of the if and else as a pair  that satisfies two actions for one given condition   ex  if it rains  take an umbrella else go without an umbrella   there are two actions    go with an umbrella go without an umbrella   and both the two actions are bound to one condition  i e is it raining   now  consider a scenario where there are multiple conditions and actions  bound together   ex  if you are hungry and you are not broke  enjoy your meal at kfc  else if you are hungry but you are broke  try to compromise  else if you are not hungry  but you just want to hangout in a cafe  try startbucks  else do anything  just don t ask me about hunger or food  i have got bigger things to worry   the else if statement to to string together all the actions that falls in between the if and the else conditions

[c] What are the differences between if, else, and else if?

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