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Kernel: R (system-wide)
r <- 1/3; print(r)
r <- pi; print(r)
options(digits =16)
r <- 1/3; print(r)
r <- pi; print(r)
options( digits =7)

sqrt(-1)
Warning message in sqrt(-1): “NaNs produced”
[1] NaN
sqrt(-1 + 0i)
[1] 0+1i
sqrt( as.complex(-1) )
[1] 0+1i
r <- typeof( pi ); print(r)
r <- typeof("bosque tropical"); print(r)
r <- typeof(2 + 2i)
[1] "double" [1] "character" 
 r <- 0/0; print(r)
r <- Inf - Inf; print(r)
Inf/Inf
[1] NaN [1] NaN
[1] NaN
r <- NaN + 1000; print(r)
r <- NaN*5; print(r)
r <- NaN/8; print(r)
r <- NaN + NaN; print(r)
log (NaN)
[1] NaN [1] NaN [1] NaN [1] NaN
[1] NaN