U3: Predefined Methods

• Has own name • Action already written • Stored in separate file “class” having name

• Needs info to be sent • Can return data to main program • Can be executed from main program

Information sent to a method

System.outprintln(Math.method(num1, num2))

• Maximum of two numbers • int num1 = 34; int num2 = 12; • Output: 34

• Minimum of two numbers • int num1 = 34; int num2 = 12; • Output: 12

• First input to power of 2nd • int num1 = 2; int num2 = 6; • Output: 64

• Absolute value • double num = -34.214; • Output: 34.214

• (num1^2 + num2^2)^½: • int sideA = 4; int sideB = 3; • Output: 5

• Rounded up nearest integer • double num = 82.114; • Output. 82.0

• Rounded down nearest integer • double num = 87.876 • Output: 87.0

• Square root of number • double num = 64; • Output: 8.0

• Rounded to nearest integer • double num = 64.545 • Output: 65

• Positive double value between 0.0 and 1.0 • System.out.println(Math.random()); • Possible Output: 0.1311034762657053

• Angle in radians to degrees • double angle1 = 0.7853981633974483; • Output: 45

• Angle in degrees to radians • double angle1 = 45; • Output: 0.7853981633974483

• Sine for angle • double angle1 = 45; • Output: 0.649448048

• Cosine for angle • double angle1 = 45; • Output: 0.760405965

Separate area from main program that contains methods program uses

• Tangent for angle • double angle1 = 45; • Output: 0.854080685

“Passing” data from main program to method

• Variables passed in method call • Inside brackets after name of method

Integers, Doubles, etc

• Defined in method definition • Appear when writing actual method