Conditional Statement in C Language

A
PRESENTATION ON CONDITIONAL
STATEMENT IN “C”
LANGUAGE
Shaina Arora
Assistant Prof. (CS) Dept. AIET

C0NTENT
1. INTRODUCTION
2. IF CONDITION
3. IF ELSE CONDITION
4. NESTED IF ELSE CONDITION
5. LADDER ELSE IF CONDITION
6. SWITCH CASE CONDITION
7. BREAK STATEMENT
8. GOTO LABEL STATEMENT
9. CONTINUE STATEMENT

INTRODUCTION
Conditional Statements Are Used To Execute A
Set Of Statements On Some Conditions. It
Provides A Unit Of Block In Which We Can
Either One Statement Or More Than One
Statments. If The Given Condition Is True Then
The Set Of Statements Are Executed Otherwise
Body Is Skipped.

IF CONDITION
It is conditional statement, which is used to
execute a set of statement on some conditions.
The condition must be of Boolean type
expression.
An expression, which returns only two value
either TRUE or FALSE, is known as Boolean type
expression.

Syntax: - if
(condition)
{
………………..
………………..
}
In Another Words, It Can Also Be Said As Single
Blocked Conditional Statements In Which Only One
Part Is Mentioned. That Is Known As TRUE Part.

Example #1: C if statement
// Program to display a number if user enters negative number
// If user enters positive number, that number won't be displayed
#include <stdio.h>
#include<conio.h>
void main()
{
int number;
printf("Enter an integer: ");
scanf("%d", &number);
// Test expression is true if number is less than 0
if (number < 0)
{
printf("You entered %d.n", number);
}
printf("The if statement is easy.");
getch();
}

IF ELSE CONDITION
It Is Known As Double Blocked Conditional
Statements .It Means, It Has TRUE Parts As
Well As FALSE Part.
If The Given Condition Is True Then The
True Part Is Executed Otherwise False Part Is
Executed.

SYNTAX: -
IF (CONDITION)
{
………………..
………………..
}
ELSE
{
………………..
………………..
}
=

EXAMPLE #2: C IF...ELSE STATEMENT
// PROGRAM TO CHECK WHETHER AN INTEGER ENTERED BY
THE USER IS ODD OR EVEN
#include <stdio.h>
#include<conio.h>
void main()
{
int number;
printf("Enter an integer: ");
scanf("%d",&number);
// True if remainder is 0
if( number%2 == 0 )
printf("%d is an even integer.",number);
else
printf("%d is an odd integer.",number);
getch();
}

NESTED IF ELSE
Using Of One If Statement Within Another If Statement
Is Known As Nested Of If else Statement.
syntax-
if (……….)
{
………….
………….
if (………)
{
…………..
…………..
}
else
{
…………
…………
}

#Include <stdio.h>
#Include<conio.h>
Void main()
{
Int a,b;
Clrscr();
printf(“Enter Two
Numbers”);
scanf(“%d%d”,&a,&
b);
If(a==b)
{
Printf(“a is equal to
else
If(a>b)
{
Printf(“a is greater”);
}
else
{
Printf(“b is greater”);
}
getch();
}
Q: - WAP to input two numbers and print the greatest
numbers.

LADDER ELSE IF CONDITION
When We Want To Specify Condition With Else
Part Then We Have To Use Ladder Of If Statement.
In This Case If The Condition Specified With First
If -Statement Is False, Then Control Goes To
Second ―Else If‖ Statement. If It Is True Then Part
(2) Is Executed Otherwise Control Goes To Third
―Else-if‖ Statement. If It Is True, Then Part (3) Is
Executed Otherwise Part (4) Is Executed.
If The Condition Specified With First If Statement
Is True, Then Part (1) Is Executed.

Syntax: -
if (……….)
{
………….
…………. 1
}
else if (…….)
{
…………
………… 2
}
else if (………)
{
………….
…………. 3
}
else
{
………….
…………. 4

Include <stdio.h>
Include<conio.h>
Void main()
{
Int a,b,c;
Clrscr();
printf ("n enter first number: -");
scanf("%d",&a);
printf("n enter secend number : -");
scanf("%d",&b);
printf("n enter third number : -");
scanf("%d",&c);
if(a>b)
{
if(a>c)
{
printf("n a is greatest: -");
}
else
{
printf("n c is greatest: -");
}
}
else
if(b>c)
{
printf("n b is greatest: -");
}
else
{
printf("n c is greatest: -");
}
getch();
}
Q: - WAP to input three number and print the greatest
number.

SWITCH CASE CONDITION
It Is Multiple Conditioned Checking
Statements, Which Is Generally Used For
Menu- Driven Program Where We Have To
Select One Option Out Of Several Options At
A Time.
The number of ―case within switch –
statement is same as the number of options
present in menu. Each ―case is used to do
only one work at a time.

Default section: -
It is optional section, which is generally used
for error handling. It means by using this
section we can displays error messages. In case
of wrong choice entry or out of range choice. It
is automatically executed when any user
enters wrong choice.

#include<stdio.h>
#include<conio.h>
void main()
{
int a;
clrscr();
printf("enter day numbern****************");
scanf("%d",&a);
switch(a)
{
case 1:
printf("monday");
break;
case 2:
printf("tuesday");
break;
case 3:
printf("wednesday");
break;
case 4:
printf("thirsday");
break;
case 5:
printf("friday");
break;
case 6:
printf("saturday");
break;
case 7:
printf("sunday");
break;
default:
printf("day not
vailedn**************");
}
getch();
}
Q: - WAP to accept day no. (1 to 7) and print the day name

GOTO LABELCONDITION
This statement is used to send the control from
one position to any desired position within a
program.
Since program is executed from top to bottom
statement by statement. So if we want to
execute certain part of program directly, then
we can use this statement to do the same work.

Label: -
May Be Any User Defined Name Or Identifiers. It Is
Just Like A Variable But Not A Variable. It Should Not
Be Declared As Variables By Any Data Type.
Label Must Be Indicated At That Place Where We Want
To Send The Control And It Must Be Followed By Colon
(:) Sign.
When It Is Directly Used In A Program Then It Just
Works As Infinite Loop. So It Must Be Used On Some
Condition.

Syn: -
goto label;
Ex: -
void main ()
{
ram:
-----
------
-------
---------
goto ram;
----------
----------
---------
}

Conditional Statement in C Language

Conditional Statement in C Language

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