Description |
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When a return
statement is executed, the current function is terminated and control
passes back to the calling function. In addition, all memory previously
allocated to automatic variables is considered unused and may be
allocated for other purposes.
If an expression follows the return
statement, the value of the expression is implicitly cast to match
the type of the function in which the return
statement appears. If the type of the function is void,
no expression may follow the return
statement.
A given function may have as many return
statements as necessary. Each may have an expression or not, as
required. Note that the C language does not require that return
statements have expressions even if the function type is not void.
If a calling program expects a value and a function does not return
one (that is, a return
statement has no expression), the value returned is undefined.
Reaching the final } character of a
function without encountering a return
is equivalent to executing a return
statement with no expression.
