Arithmetic Operators and Expressions in CS150, Slides of Computer science

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Arithmetic Operators

CS150 Introduction to Computer Science 1

Today •

Arithmetic Operators & Expressions o sections 2.15 & 3. o Computation o Precedence 9/15/ o Algebra vs C++ o Exponents CS150 Introduction to Computer Science 1

Assigning

float

s to

int

s

What is the output here? int intVariable; double doubleVariable 78.9; intVariable = doubleVariable; 9/15/ cout << intVariable; CS150 Introduction to Computer Science 1

Arithmetic Operators •

Operators allow us to manipulate data o Unary: operator operand o Binary: operand operator operand Operator Meaning Type Example

Negation Unary - 5 (left hand side) (right hand side) 9/15/

Negation Unary - 5 = Assignment Binary rate = 0.

Multiplication Binary **cost

rate** / Division Binary cost / 2 % Modulus Binary cost % 2

Addition Binary **cost

tax**

Subtraction Binary **total

tax** CS150 Introduction to Computer Science 1

Division •

grade

grade is 2 o If both operands of the division operator are integers, then integer division is performed.
the data type of grade is not considered, why? o We say the integer is truncated. Everything 9/15/ o We say the integer is truncated. Everything after the decimal point is dropped. No rounding.

grade

o grade is 2. o What data type should grade be declared as? CS150 Introduction to Computer Science 1

Modulus •

Modulus is the remainder after integerdivision

grade

o grade =? 9/15/

grade

o grade =?

rem = x

n; o What are the possible values for rem ? 9/14/ CS150 Introduction to Computer Science 1

Mathematical Expressions •

Complex mathematical expressions arecreated by using multiple operators andgrouping symbols o expression: programming statement that has value 9/15/ value o sum = 21 + 3; o number = 3; CS150 Introduction to Computer Science 1 expression In these two examples,we assign the value ofan expression to a variable

Examples •

result

x;

result

+ result;

result

result

number; 9/15/

result

number;

result

**a

• b**

c;

result

**a

• b**

d

c

- q

cout << “The value: “ << (sum / 2) << endl; CS150 Introduction to Computer Science 1

Operator Precedence

Precedence of Arithmetic Operators(Highest to Lowest) (unary negation) - 9/15/

/ %

• CS150 Introduction to Computer Science 1 If two operators have the same precedence, evaluatethem from left to right as they appear in the expression

Q.2. Practice a.

b.

c.

d.

9/15/ d.

e.

CS150 Introduction to Computer Science 1