This document discusses the for loop in programming. It explains that a for loop allows performing the same set of instructions repeatedly until a condition is met. The general form of a for loop is presented as "for(expression1; expression2; expression3)" where expression1 initializes the counter variable, expression2 defines the condition to continue looping, and expression3 alters the counter variable. Nesting of for loops and multiple assignments within a for loop are also described.

2. FOR LOOP
PRESENTED BY:
 FAROOQ MUSTAFA JOYIA
(169-FET/BSME/F11-B)
DEPARTEMENT OF MECHANICAL ENGINEERING
FACULTY OF ENGINEERING AND TECHNOLOGY
INTERNATIONAL ISLAMIC UNIVERSITY ISLAMABAD

3. AGENDA
 WHAT IS LOOPING?
 GENERAL FORM OF FOR LOOP
 DESCRIPTION OF GENERAL FORM
 EXECUTION
 NESTING THE LOOP
 MULTIPLE ASSIGNMENTS IN FOR
LOOP
 NULL STATEMENT

4. WHAT IS LOOPING?
 LOOPING, also called iteration, is
used in programming to perform the
same set of instructions over and
over until certain specified conditions
are satisfied.
 Here we will discuss about for loop

5. GENERAL FORM
 General form of for statement is
 for(expression1;expression2;expression3)
 {
 Statement1;
 Statement2;
 .
 .
 .
 }

6. EXPRESSION 1
 Thisis some kind of
expression which initializes the
control variable. This
statement is only carried out
once before the starting of for
loop.

7. EXPRESSION 2
 Thisexpression is evaluated at
the beginning of for loop and
the loop is only carried out
when this expression is true.

8. EXPRESSION 3
 This is some kind of
expression for altering the
value of control variable.
 e.g. i++

9. EXECUTION OF FOR LOOP
 When the loop is started
normally a control variable is
initialized by executing.
 Expression_2 is tested if it is
false then control is
transferred outside the loop
otherwise do next step_3.
 Body of loop is executed.
 Value of control is altered by
expression 3.
 Step 2 and 4 are repeated
until condition becomes false.

10. NESTING THE LOOPS
 When a for loop is
completely
embedded within
for loop, the
structure is called
nested for loop.

11. Inner for loop must finish
first than outer loop must
start another iteration, if
the specified condition is
still met.

12. MULTIPLE ASSIGNMENTS IN
FOR LOOP
 We can use more than one
initialization statement &more
than one increment decrement
statement. However only one
condition is allowed within a for
loop.

13.  main()
{
 int x,y;
 for(x=1,y=10;x<=10;x++,y--)
 printf (“x=%dt y=%dn:,x,y);

14. NULL STATEMENT
 The for statement does not end with a
semicolon.
 The for statement has within it either a
statement block that ends with the closing
brace or a single statement that ends with
a semicolon.

15. THE END