21.keypad calculator

What is a keypad calculator?

• A calculator that uses a touch screen interface

• A calculator that uses a keyboard interface

• A calculator that uses voice recognition

• A calculator that uses a pen interface

Why do we need to use keypad library in an Arduino keypad calculator?

• To perform mathematical operations

• To display the output on an LCD screen

• To read input from the keypad

• To connect to the internet

How is input from a keypad stored in an Arduino sketch?

• As a string

• As an integer

• As a floating-point number

• As a character array

How many rows and columns are typically used in a standard 4x4 keypad?

• 4 rows and 4 columns

• 3 rows and 4 columns

• 4 rows and 3 columns

• 3 rows and 3 columns

How many charecters can you see on the keypad ?

• 12

• 10

• 16

• 14

What is the use of the lcd display in an Arduino keypad calculator?

• To perform mathematical operations

• To display the Characters on an LCD screen

• To read input from the keypad

• To connect to the internet

can we perform division operation using keypad calculator?

• YES

• NO