Math Operations

 

  As has been described earlier, math functions are called in the same manner as all other functions: a list whose first element is a math operator, and the rest of whose elements are arguments to that operator. The following math operators are defined:

(+  )
Addition: returns .

 
		 (+ 2 3) 		    		 5

		 (+ 1.5 2.35) 		    		 3.85

(-  )
Subtraction: returns .

 
		 (- 5 2) 		    		 3

		 (- 2.7 1.3) 		    		 1.4

(*  )
Multiplication: returns .

 
		 (* 3 5) 		    		 15

		 (* 1.5 2.5) 		    		 3.75

(/  )
Division: returns .

 
		 (/ 8 2) 		    		 4

		 (/ 1.5 3) 		    		 0.5

(quotient  )
Integer division: returns the integer portion of .

 
		 (quotient 9 4) 		    		 2

		 (quotient 9 3) 		    		 3

(remainder  )
Remainder: returns the remainder that results from the division of by , or .

 
		 (remainder 9 4) 		    		 1

		 (remainder 9 3) 		    		 0

(sqrt  n)
Square root: returns .

 
		 (sqrt 4) 		    		 2

		 (sqrt 2) 		    		 1.4142135623731

(expt  )
Exponentiation: returns .

 
		 (expt 2 3) 		    		 8

		 (expt 4 0.5) 		    		 2