-
Define
X and Y to be two different integers
-
Print
their sum and difference to the terminal screen
-
Repeat,
all on one IDL command line, using the "&" character
-
Repeat
all of the above, using the recall buffer ("up" arrow)
-
Print
the result of adding 3 times X to 2 times Y
-
Print
the product of (X-Y) and (X+Y)
-
Print
the common logarithm of the absolute value of X+Y (use the ABS and ALOG10
functions)
-
Confirm
this result by raising 10.0 to the power you just obtained
-
What
is the difference between X = 5/2 and Y = 5./2 ?
-
Between
X = FLOAT(5/2) and Y = FLOAT(5)/2 ?
-
Set
C equal to the numerical value of the speed of light in cgs units
-
Successively
print powers of C until you locate the point at which the result becomes
"Inf".
-
What
power yields this result? [The answer is non-integer.]
-
Now
define C to be the speed of light in double precision.
-
Repeat
the exercise above [Hint: you should accelerate all such exercises by making
liberal use of the recall buffer and line editing.]
-
String
example: define a string variable for each word in the sentence:
"This is a concatenation"; then concatenate them and print the
result.
