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Putting semicolons after while and if statements in C++
When you have a statement like −
while (expression);
the while loop runs no matter if the expression is true or not. However, if you put −
if (expression);
the statement runs no matter if the expression is true or not. This is because the syntax for if and while is −
if (<expr>) <statement> // or while (<expr>) <statement>
So the <statement> is only executed if the <expr> evaluates to true. In while, it will enter an infinite loop.
So the question what <statement> it executes. If there are not braces {} then the next statement is terminated by; even if that statement is EMPTY. Note that an empty statement is valid.
if (<expr>) /* Empty Statement */; while (<expr>) /* Empty Statement */;
In both cases, there is nothing being executed (after the expression is evaluated). Though while may enter an infinite loop. Note: '{}' is a statement-Block (a type of statement (that contains a list of other statements).
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