The result of the preceding
step follows from the fact that the variable x has been assigned the value
3 and the variable y has been assigned the value 2. Check this by entering x; y;
Enter the following line.
Note that it ends with a colon rather than a semicolon. z:=5:
Now, using a semicolon, enter z;
Entering a line with a colon has the same long-term effect as entering
it with a semicolon, but nothing is displayed afterwards.
Use pencil and paper to
decide what number xy2 + 3z represents, and then check your
answer by entering x*y^2+3*z; Use your mouse to return to the expression just entered, replace
the 3 by 4, and press RETURN.
Suppose we want to remove
the identification of x with 3. Enter x:='x';
Check this by entering x; Now remove the identifications of y with 2 and z with 5. Check
by entering x*y*z; You should see xyz as the
output.
Enter 2+3; and then %+5; The percent sign has the value of the last quantity calculated.
Check this by entering x*y; and then %+z;
