 causes the
program to enter the macro input mode. The second line causes the
default values for numeric words #1 and #2, which are input when the
macro is run, to be set to 0.0. The third line moves the first numeric
word into the X-register. STO 1 stores that value in numeric register
#1. Next, numeric word #2 is moved to the X-register and then added
into numeric register #1 with the STO PLUS 1 command. Next, the sum in
register 1 is recalled into the X-register. The output format is set
to F13.6. The su