Data Types, Expressions, and Operations

Escape Sequences¶

Sequence	Description
`\t`	tab
`\n`	new line
`\"`	quotation mark
`\\`	backslash

Data Types¶

Type	Description	Examples
`int`	integers, numbers without fractional components	`42`, `-3`, `92851`
`double`	decimal numbers	`3.14`, `2.0`
`String`	text	`"Hello"`, `"CSE 121"`
`boolean`	logical values	`true`, `false`

Expressions¶

Precedence: () before * / % before + -
with int, / is integer division and % is integer remainder
Strings can be concatenated with other values

For the expression 1 times 2 plus 3 times 5 divided by 4, we start off by evaluating 1 times 2, which evaluates to 2, leaving us with the expression 2 plus three times 5 divided by 4. We then evaluate 3 times 5, which is 15, leaving us with the expression 2 plus 15 divided by 4. Then, we evaluate 15 divided by 4, which gives us 3, leaving us with the expression 2 plus 3, which evaluates to 5. — Example with integers

For the expression, double quote $ double quote plus 9.0 divided by 4.0 plus 1, we first perform 9.0 divided by 4.0, which is 2.25, giving us a the resulting expression double quote $ double quote plus 2.25 plus 1. We then evaluate double quote $ double quote plus 2.25, which is double quote dollar sign 2.25 double quote, leaving us with the expression double quote dollar sign 2.25 double quote plus 1, which results in double quote dollar sign 2.251 double quote. — Example with Strings and doubles

Arithmetic Operators¶

(Compute a value using arithmetic operations)

Operator	Meaning
`+`	addition
`-`	subtraction, negation
`*`	multiplication
`/`	division
`%`	remainder (“modulus”)

Relational Operators¶

Operator	Description
`<`	less than
`<=`	less than or equal
`>`	greater than
`>=`	greater than or equal
`==`	equal
`!=`	not equal

Logical Operators¶

(Evaluate expressions as true or false)

Operator	Description
`&&`	and
`\|\|`	or
`!`	not

Truth Table for `&&`¶

Expression	Result
`true && true`	`true`
`true && false`	`false`
`false && true`	`false`
`false && false`	`false`

Truth Table for `||`¶

Expression	Result
`true \|\| true`	`true`
`true \|\| false`	`true`
`false \|\| true`	`true`
`false \|\| false`	`false`