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The switch case is clearly better than the way the if statement is used in @h3half's code, but it should be noted that neither is really good (better compare just once with a variable that indicates the correct answer, and if it's not the correct then check just once if the given answer is in the range of valid answers). – leftaroundabout May. Oct 10, 2011  As it stands, all of your if statements are chained, so if you don't enter the first one (if temparture = 90), then you won't check any of the others. Also, your syntax is screwed up on the middle ones, if you want to check if something is within a range you must do it like this.

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An if statement can be followed by an optional else statement, which executes when the Boolean expression is false.

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C Program to Check Whether Number is Even or Odd In this example, if.else statement is used to check whether a number entered by the user is even or odd.

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The syntax of an if..else statement in C programming language is −

If the Boolean expression evaluates to true, then the if block will be executed, otherwise, the else block will be executed.

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C programming language assumes any non-zero and non-null values as true, and if it is either zero or null, then it is assumed as false value.

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When the above code is compiled and executed, it produces the following result −

If..else if..else Statement

An if statement can be followed by an optional else if..else statement, which is very useful to test various conditions using single if..else if statement.

When using if..else if.else statements, there are few points to keep in mind −

  • An if can have zero or one else's and it must come after any else if's.

  • An if can have zero to many else if's and they must come before the else.

  • Once an else if succeeds, none of the remaining else if's or else's will be tested.

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The syntax of an if..else if..else statement in C programming language is −


When the above code is compiled and executed, it produces the following result −


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Controls conditional branching. Statements in the if-block are executed only if the if-expression evaluates to a non-zero value (or TRUE). If the value of expression is nonzero, statement1 and any other statements in the block are executed and the else-block, if present, is skipped. If the value of expression is zero, then the if-block is skipped and the else-block, if present, is executed. Expressions that evaluate to non-zero are

If then dev c online
  • TRUE
  • a non-null pointer,
  • any non-zero arithmetic value, or
  • a class type that defines an unambiguous conversion to an arithmetic, boolean or pointer type. (For information about conversions, see Standard Conversions.)



if statement with an initializer

Visual Studio 2017 version 15.3 and later (available with /std:c++17): An if statement may also contain an expression that declares and initializes a named variable. Use this form of the if-statement when the variable is only needed within the scope of the if-block.


In all forms of the if statement, expression, which can have any value except a structure, is evaluated, including all side effects. Control passes from the if statement to the next statement in the program unless one of the statements contains a break, continue, or goto.

The else clause of an if..else statement is associated with the closest previous if statement in the same scope that does not have a corresponding else statement.

if constexpr statements

Visual Studio 2017 version 15.3 and later (available with /std:c++17): In function templates, you can use an if constexpr statement to make compile-time branching decisions without having to resort to multiple function overloads. For example, you can write a single function that handles parameter unpacking (no zero-parameter overload is needed):

See also

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Selection Statements
switch Statement (C++)