C

1
C

• Typecasting. Math Library Functions.

2
Operator / Operands

• A x y

3
Typecasting

• What is the integral expression?
• What is a decimal expression?
• What is mixed expression?
• What will be the result of those expression?

4
Typecasting

• What is typecasting?
• What are the two types of typecasting?
• Examples

5
Implicit Typecasting

• 3.4 / 2 3.4 / 2.0 1.7

6
Explicit Typecasting

• int x3, y2
• double z
• z x/y //integer division,
  z1.0
• z double(x)/y // z1.5

What is the datatype of x after this operation?
7
Explicit Typecasting

• double(x)
• is equivalent to
• (double)x
• is equivalent to
• static_castltdoublegtx

8

• int number
• cout ltlt Enter a number //User enters 10
• cin gtgt number
• What is stored in variable number?

10
9

• int number
• cout ltlt Enter a number//User enters 10.3
• cin gtgt number
• What is stored in variable number?

10
10

• float number
• cout ltlt Enter a number //User enters 10.3
• cin gtgt number
• What is stored in variable number?

10.3
11

• float number
• cout ltlt Enter a number //User enters 10
• cin gtgt number
• What is stored in variable number?

10.0
12

• int num13
• int num25
• int product
•  
• product num1 num2
• What is stored in variable product?

15
13

• float num13.1
• int num25
• int product
•  
• product num1 num2
• What is stored in variable product?
•  

15
14

• float num13.1
• int num25
• float product
•  
• product num1 num2
• What is stored in variable product?
•  

15.5
15

•  
• int num13
• int num25
• float product
•  
• product num1 num2
• What is stored in variable product?
•  

15.0
16
Integer Division ( / )

• int/int ? int
•  
• 10/3
• 30/5
• 5/6
• 9/8
• 22/5

17
Mod Operator ( )

• int int int
•  
• 103
• 305
• 56
• 98
• 225

18

• int num1 13
• int num2 4
• int quotient
•  
• quotient num1 /num2
• What is stored in variable quotient?
•  
•  

3
19

• int num1 13
• int num2 4
• float quotient
•  
• quotient num1 /num2
• What is stored in variable quotient?
•  
•  

3.0
20

• int num113
• int num24
• float quotient
• quotient float(num1) /num2
• What is stored in variable quotient?
• What is stored in variable num1?
•  

3.25 13
21

• int num113
• int num24
• float quotient
• quotient float(num1/num2)
• What is stored in variable quotient?
•  

3.0
22
Character Typecasting

• char letter a
• coutltlt int(letter) // What is displayed?
• int x98
• coutltltchar(x) //What is displayed?

97
b
23
Character Typecasting

• char letter'a'
• coutltlt int(letter) ltlt endl
• letter letter 1
• coutltlt letter ltlt endl
• coutltlt letter 1 ltlt endl
• coutltlt char (letter1) ltlt endl
• coutltlt int(letter) ltlt endl

97
b
99
c
98
24

• Find an average of three numbers
• int x, y, z
• float average
• average(xyz)/3

• average(float(x)yz)/3.0

• average(xyz)/3.0