reals is the sum of all real numbers.
reals is the sum of all real numbers.
what is the sum of all real numbers?
reals
Na
Na
bullet::::- sum of three rational real numbers and two rational complex numbers









































(define x (+ 1/3 1/4 -1/5 -1/3i 405/50+2/3i))









































x









































=== 509/60+1/3i









































bullet::::- check for exactness.









































(exact? x)









































=== #t









































example 2: same arithmetic in an implementation that supports neither exact 









































rational numbers nor complex numbers but does accept real numbers in rational notation.









































bullet::::- sum of four rational real numbers









































(define xr (+ 1/3 1/4 -1/5 405/50))









































bullet::::- sum of two rational real numbers









































(define xi (+ -1/3 2/3))









































xr









































=== 8.48333333333333









































xi









































=== 0.333333333333333









































bullet::::- check for exactness.









































(exact? xr)









































=== #f









































=== #f
scheme (programming language)