|Parameters||n, a number|
|Purpose||Determines if v is a real number (no complex part).|
|Produces||A truth value: true (|
|Preconditions||Only one parameter (verified).|
|Postconditions||Returns true if and only if the parameter is a real number. Note that my version of Scheme seems to treat any non-complex numbers as real. Note also that values that are not numbers (e.g., lists and symbols) are not real.|
> (real? 1) #t > (real? 3/2) #t > (real? -1/2) #t > (real? 1.3) #t > (real? (sqrt 2)) #t > (exp 1) 2.718281828459045 > (real? (exp 1)) #t > (real? (sqrt -1)) #f > (real? 'a) #f
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