1. The document outlines different types of loops in C++ including for, while, and do while loops. 2. The for loop executes a section of code a fixed number of times based on a loop variable. The while loop repeatedly executes a target statement as long as a given condition is true. 3. Unlike for and while loops, the do while loop checks its condition at the bottom of the loop so the loop body is always executed at least once.

1. 1
Chapter 03

2. 2
Loops

3. 3
Outline
• Introduction
• for Loop
• while Loop
• do while Loop
• Nested Loops
• Values of functions and assignment
expressions
• break and continue Statements

4. 4
Introduction
• A loop causes a section of program to be repeated a
certain number of times
• The repetition continues till the condition remains
true: When the condition becomes false the loops
exits and the control passes to the statements
following the loop.
• C++ allows (03) three kinds of loops:
– FOR
– WHILE –
DO … WHILE

5. for Loop
• The for loop
executes a section
of code a fixed
number of times
• It is usually
(although not
always) used when
it is known in
advance how many
times the code
should be
executed.

6. j is loop variable

7. for Loop Operation

8. Exit Loop

9. for Loop: Example
for Loop: Exercises
1. Square all numbers from 1 to 10

10. 2. Write a program that generates the following table:
2 x 1 = 2 2 x 2 =
4
2 x 3 = 6
2 x 4 = 8
2 x 5 = 10
3. Print even and odd number from 0 and 1 respectively up to
20
4. Write a program that displays the output:
WHILE Loop
n is loop variable

11. • A while loop
repeatedly executes a
target statement as
long as a given
condition is true.

12. WHILE Loop Operation
Exit Loop

13. WHILE Loop: Example
#include <stdio.h>
#include <conio.h>
int main()
{
int n = 99;
while (n!=0) scanf(“%d”,
&n); getch();
}
DO … WHILE Loop

14. Unlike FOR and
WHILE loops, which test
the loop condition at the top
of the loop, the DO … WHILE
loop checks its condition at
the bottom of the loop.
The DO … WHILE loop is used
when it is guaranteed that
the loop body will be
executed at least once, even
if the test expression initially
returns false.

15. DO…WHILE Loop Operation
Exit Loop