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Additional info for A Concise and Practical Introduction to Programming Algorithms in Java (Undergraduate Topics in Computer Science)

Example text

C o s ( x ) ; System . out . " ) ; System . out . p r i n t l n ( f x ) ; } } The output of the program is: Is this precisely 1 or are there numerical errors? E is defined as the double value that is closer than any other to e. 0000000000000002. 10 1. 3 Declaring constants Constants are declared by prepending to the type of variables the keyword static. That is, constants are immutable variables. Constants are also typed too. 14; The declaration of constants should be made inside the body of the class (and not inside functions).

For example, consider the code: c l a s s ProgSwitch { public s t a t i c void main ( S t r i n g a r g [ ] ) { System . out . 9]: " ) ; Scanner keyboard=new Scanner ( System . i n ) ; i n t n=keyboard . n e x t I n t ( ) ; switch ( n ) { case 0 : System . out . p r i n t l n ( " zero " ) ; break ; case 1 : System . out . p r i n t l n ( " one " ) ; break ; case 2 : System . out . p r i n t l n ( " two " ) ; break ; case 3 : System . out . p r i n t l n ( " three " ) ; break ; default : System .

A : B In Java, there is also a special compact form of the if else conditional used for variable assignments called a ternary operator. This ternary operator Predicate ? A : B provided for branching assignments is illustrated in the sample code below: double x1=Math . PI ; // constants defined in the Math class double x2=Math . E ; double min=(x1>x2 ) ? x2 : x1 ; // min value double d i f f = ( x1>x2 ) ? x1−x2 : x2−x1 ; // absolute value System . out . 423310825130748 The compact instruction double min=(x1>x2)?

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