1. Introduction 2. Simple if else statement 3. Nesting of if else statement 4. Else if Ladder

1. Active Learning Assignment
Topic:Simple if else statement,Nesting of if else statement & Else If Ladder
Prepared by : - Manimay Adhikary
(180084)

2. Brief flow of presentation
1. Introduction
2. Simple if else statement
3. Nesting of if else
statement
4. Else if Ladder

3. The if else Statement
if else statement: A control structure that executes one block of
statements if a certain condition is true, and a second block of
statements if it is false. We refer to each block as a branch.
General syntax:
if (<test>) {
<statement(s)> ;
} else {
<statement(s)> ;
}
Example:
#include<stdio.h>
int main()
{
int number;
printf("Enter an integer: ");
scanf("%d",&number);

4. Flow chart
// True if remainder is 0
if( number%2 == 0 )
printf("%d is an even
integer.",number);
else
printf("%d is an odd
integer.",number);
return 0;
}
Output: Enter an integer: 7
7 is an odd integer

5. Nested if...else statement
-The if...else statement executes two different codes depending
upon whether the test expression is true or false.
- Sometimes, a choice has to be made from more than 2
possibilities.
-The nested if...else statement allows you to check for multiple
test
expressions and execute different codes for more than two
conditions.

6. Syntax of nested if...else statement
if (testExpression1)
{
// statements to be executed if testExpression1 is true
}
else if(testExpression2)
{
// statements to be executed if testExpression1 is false and testExpression2 is true
}
else if (testExpression 3)
{
// statements to be executed if testExpression1 and testExpression2 is false and testExpression3 is
true
}
.
else
{
// statements to be executed if all test expressions are false
}

7. Example
#include <stdio.h>
int main()
{
int number1, number2;
printf("Enter two integers: ");
scanf("%d %d", &number1, &number2);
//checks if two integers are equal.
if(number1 == number2)
{
printf("Result: %d = %d",number1,number2);
}
//checks if number1 is greater than number2.
else if (number1 > number2)
{
printf("Result: %d > %d", number1, number2);
}

8. // if both test expression is false
else
{
printf("Result: %d < %d",number1, number2);
}
return 0;
}
Output:
Enter two integers: 12
23
Result: 12 < 23

9. Nested if else if Flow Chart
if (<test>) {
<statement(s)>;
} else if (<test>) {
<statement(s)>;
} else if (<test>) {
<statement(s)>;
}

11. The else if ladder

12. Example
main()
{
int units, custnum;
float charges;
printf("Enter customer no. and units consumedn");
scanf("%d%d",&custnum,&units);
if(units<=200)
charges=0.5*units;
else if(units<=400)
charges=100+0.65*(units-200);
else if(units<=600)
charges=230+0.8*(units-400);
else
charges=390+(units-600);
printf("nnCustomer no:%d Charge=%.2fn", custnum, charges );
}

13. Thank You..