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Arithmetic Operators and Expressions

- Operands
- Arithmetic operators and their properties
- Arithmetic expressions

Lets take a look at L3_3.c p.95

Arithmetic Operators

- Addition operator
- - Subtraction operator
- Multiplication operator
- / Division operator
- Mod operator (remainder)
- No exponentiation operator must use math function

Relational and Logical Operators

- Inequality operators
- gt Greater than
- gt Greater than or equal
- lt Less than
- lt Less than or equal
- Equality operators
- equal
- ! not equal
- Logical operators
- AND
- OR
- ! NOT

Assignments

- Simple assignment operator
- Compound assignment operator
- (n 2 is the same as n n 2)
- -
- /

Increment and Decrement Operators

- increment operator
- n is same as n n 1
- -- decrement operator
- n-- is same as n n - 1

C Language Operator Precedence Chart

Example L3_4.c

Things to Remember

- When doing division make sure that it does not

involve 2 integers unless you really want the

fractional part to be cut off. - When doing an assignment to a float make sure

values on the right hand side used decimal points

(6.0 not 6) - When doing an assignment to an integer make sure

the value on the right hand side is an integer

Modifing the way C does arithmetic operations

- int aa5, bb3, cc
- float xx, yy12.3, zz18.8
- //Use cast operator to temporarily change data

type - xx ((float) aa) / ((float) bb)
- cc (int)yy (int) zz

Lesson 3.5 Reading data from the keyboard

- Using the scanf( ) function
- Entering data from the keyboard
- The address operator
- double type data

How to input data from the keyboard?

- scanf (ltformat_stringgt, ltargument_listgt)
- scanf (f lf, income, expense)

Address Of Operator

- This is used to tell C to pass the address of the

variable to the function instead of the value. - You must use with your arguments in scanf()!!

Common Errors Using Scanf

- Forgetting the address of operator ()
- Should use printf to tell user that your program

is waiting for input - prompts - Make sure to match your conversion specifications

with variable types. - Use lf for double
- Use f for floats
- Use d for ints

Math Library Functions

- Using standard math header file
- double -vs- float data type
- Other data types

How to use math functions?

- include ltmath.hgt

Example L3_7.c

How to write your programs

- Problem Statement
- Understand what you are trying to solve.
- Gather the facts (What is known).
- Do a hand calculation of an example problem

(solve a specific case). - Write an Algorithm in pseudocode.
- Use the Algorithm to write the actual program.

Application Program 3.2 Temperature Units

Conversion

- Problem Statement Write a program that creates

a table of degrees Celsius with the corresponding

degrees in Fahrenheit. Begin at 0 degrees

Celsius and go to 100 degrees Celsius in 20

degree increments.

Solution

- What data do we need
- How to convert from Celsius to Fahrenheit
- F (9/5 C) 32
- F degrees in Fahrenheit
- C degrees in Celsius
- Starting and Ending values (0 100)
- Increment (20)

Algorithm

- Declare variables (What data types to use)
- Print heading of table
- Set C starting point and calculate F
- Print C and F
- Increment C and recalculate F and stop at 100
- Print C and F for each increment

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