Iteration Statements (C++)

Iteration statements cause statements (or compound statements) to be executed zero or more times, subject to some loop-termination criteria. When these statements are compound statements, they are executed in order, except when either the break statement or the continue statement is encountered.

C++ provides three iteration statements — while, do, and for. Each of these iterates until its termination expression evaluates to zero (false), or until loop termination is forced with a break statement. The following table summarizes these statements and their actions; each is discussed in detail in the sections that follow.

Iteration Statements

Statement

Evaluated At

Initialization

Increment

while

Top of loop

No

No

do

Bottom of loop

No

No

for

Top of loop

Yes

Yes

The statement part of an iteration statement cannot be a declaration. However, it can be a compound statement containing a declaration.

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