If Else If Statement In Dev C++
- C Programming Tutorial
- C Programming useful Resources
- In this tutorial, you will learn about if statement (including if.else and nested if.else) in C programming with the help of examples. C if Statement The syntax of the if statement in C programming is.
- If else statements in C is also used to control the program flow based on some condition, only the difference is: it's used to execute some statement code block if the expression is evaluated to true, otherwise executes else statement code block.
- Reason to Avoid goto Statement. The goto statement gives power to jump to any part of program but, makes the logic of the program complex and tangled. In modern programming, goto statement is considered a harmful construct and a bad programming practice. The goto statement can be replaced in most of C program with the use of break.
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An if statement can be followed by an optional else statement, which executes when the Boolean expression is false.
Error 127 dev c++. C else-if Statements - else if statements in C is like another if condition, it’s used in a program when if statement having multiple decisions.
Syntax
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.
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.
Flow Diagram
Dev C++ If Else
Example
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.
Syntax
The syntax of an if..else if..else statement in C programming language is −
Example
When the above code is compiled and executed, it produces the following result −
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
- 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.)
Syntax
Example
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.
Example
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
If Else Statement In Dev C++
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):
If Else If Statement In Dev C Language
See also
Selection Statements
Keywords
switch Statement (C++)