Library Routines | Computer for GCSE/IGCSE - Year 11 PDF Download

Library Routines

Library routines are preexisting code snippets utilized in programs to execute particular functions.

• Employing library routines reduces time spent on writing code anew.
• Library routines are rigorously tested and reliable, minimizing the likelihood of errors.
• Typical library routines encompass functionalities such as input/output operations and mathematical computations.
• Integrating libraries into programs involves importing them.
• The syntax for importing a library may differ based on the programming language.
• Consulting the library's documentation is crucial to grasp its usage and available functions.

Maths routines

MOD Function

The MOD function returns the remainder when one number is divided by another number.

• Pseudocode example: x MOD y
• Python example: x % y
• Java example: x % y
• Visual Basic example: x Mod y

DIV Function

The DIV function returns the quotient when one number is divided by another number.

• Pseudocode example: x DIV y
• Python example: x // y
• Java example: x / y
• Visual Basic example: x \ y

ROUND Function

The ROUND function rounds a number to a specified number of decimal places.

• Pseudocode example: ROUND(x, n)
• Python example: round(x, n)
• Java example: Math.round(x * 10^n) / x;
• Visual Basic example: Math.Round(x, n)

RANDOM Function

The RANDOM function generates a random number between x and n.

• Pseudocode example: RANDOM(x, n)
• Python example: random.randint(x, n)
• Java example: rand.nextInt(x)
• Visual Basic example: rand.next(x, n)