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The goto statement unconditionally transfers control to the statement labeled by the specified identifier.
Goto Statement (C); 2 minutes to read +1; In this article. The goto statement unconditionally transfers control to the statement labeled by the specified identifier. Syntax goto identifier; Remarks. The labeled statement designated by identifier must be in the current function. All identifier names are members of an internal namespace and therefore do not interfere with other. If-else Statement (C) 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.
Syntax
Remarks
The labeled statement designated by identifier must be in the current function. All identifier names are members of an internal namespace and therefore do not interfere with other identifiers.
A statement label is meaningful only to a goto statement; otherwise, statement labels are ignored. Labels cannot be redeclared.
A goto statement is not allowed to transfer control to a location that skips over the initialization of any variable that is in scope in that location. The following example raises C2362:
It is good programming style to use the break, continue, and return statements instead of the goto statement whenever possible. However, because the break statement exits from only one level of a loop, you might have to use a goto statement to exit a deeply nested loop.
For more information about labels and the goto/hazel-mac-rules.html. statement, see Labeled Statements.
Example
In this example, a goto statement transfers control to the point labeled stop when i equals 3.
See also
Jump Statements
Keywords
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.
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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
Como Usar Docs
Selection Statements
Keywords
switch Statement (C++)