Expressions and Output

Expressions and Output

Students will be able to...

• Differentiate between System.out.print and System.out.println

• Format output using escape sequences

• Write and evaluate arithmetic expressions in Java

• Predict and explain output of integer vs. floating-point division

Warm Up

Open Ended

What are some examples of programs or apps that format their output for readability?

Warm Up

• Chat apps

• Email

• Game User Interfaces

Open Ended

Why might it be important to control where a line break happens in your output?

Warm Up

• Ensure clarity

• Align Text

• Match expected formatting

Open Ended

What kind of math do you think computer programs need to do?

Warm Up

• Basic addition

• Complex data analysis

• Predictions

Now It's Your Turn!

• Head to CodeHS and access the Expressions and Output (Day 2) modules. You will be completing:

  • How Many Gigs?

  • Tricky Integer Division

  • Weight of a Pyramid

  • Tip Calculator

  • Exploration: Temperature Conversion

Wrap Up

Match

Match the following concepts

• Prints out a line of output to the user

• Print output to the user, without ending the line printed

• Divides 2 numbers and returns the remainder, uses a % symbol

• When 2 integers are divided, the decimal values are truncated or chopped off

System.out.println

System.out.print

Modulus/Modulo/Mod

Integer Division

• System.out.println

• System.out.print

• Modulus/Modulo/Mod

• Integer Division

Match

Match the following concepts

• Characters with special meanings

• Combination of numbers, operators, and sometimes variables that compute a value

• Trim digits of a double-type number

Escape Sequence

Arithmetic Expression

Truncation

• Escape Sequence

• Arithmetic Expression

• Truncation

Open Ended

How does System.out.print behave differently from System.out.println?

Wrap Up

• print keeps output on the same line

• println adds a new line after the text

Open Ended

Why do we sometimes get unexpected results with integer division?

Wrap Up

• It will truncate the decimal number and not round it

Open Ended

How can escape sequences help make your output clearer or more readable?

Wrap Up

• Allow structured, multi-line output while using only one print statement