Iteration statements allow code to be repeated based on a condition. The main types of iteration statements are: 1) For loops iterate based on a initialization, condition, and post-iteration expression. They are commonly used when the number of iterations is known. 2) While loops iterate as long as a condition is true. The condition is checked at the start of each iteration. 3) Do-while loops are similar to while loops but execute the code block once before checking the condition, so the code is always run at least once.

1. Iteration Statement
Made by
Gaurav Yadav
XI-A
Roll No- 10

2. What is Iteration?
Iteration construct means repetition
of set of statements depending
upon a condition test. Till the time of
condition is true. ( or false
depending upon the loop). A set of
statements are repeated again and
again. As soon as the condition
become false (or true), the
repetition stops. The iteration
condition is also called ”Looping
Statement ”.

4. Type of

5. The for Loop

6. The for Loop
• In computer science a for-loop (or simply for loop) is a programming
language control statement for specifying iteration, which allows code to
be executed repeatedly.
• Syntax
for (ForInit ; ForExpression; PostExpression)
Action
• Example
for (int i = 0; i < 3; ++i) {
cout << "i is " << i << endl;
}

7. Flow
Chart
For
A
for-
Loop
ForExpr
Action
true false
ForInit
PostExpr
Evaluated once
at the beginning
of the for
statements's
execution
The ForExpr is
evaluated at the
start of each
iteration of the
loop
If ForExpr is
true, Action is
executed
After the Action
has completed,
the
PostExpression
is evaluated
If ForExpr is
false, program
execution
continues with
next statement
After evaluating the
PostExpression, the next
iteration of the loop starts

8. Example
• Output• Input

9. The while Loop

10. The while Loop
• In most computer programming languages, a while loop is a control
flow statement that allows code to be executed repeatedly based on a
given boolean condition. The while loop can be thought of as a repeating if
statement.
• Syntax
Logical expression that determines
whether the action isto be executed
while ( Expression) Action
Action to be iteratively
performed until logical
expression isfalse

11. Flow
Chart
Of
A
while
Loop
Expression
Action
true false
Expression is
evaluated at the
start of each
iteration of the
loop
If Expression is
true, Action is
executed If Expression is
false, program
execution
continues w ith
next statement

12. Example
Input Output

13. The do-while Loop

14. The do-while Loop
• a do while loop is a control flow statement that executes a block of code at
least once, and then repeatedly executes the block, or not, depending on a
given boolean condition at the end of the block.
• Syntax
do Action
while (Expression)

15. Flow Chart

16. Example
Input Output

17. Iteration Do’s