Release calc version 2.10.2t30

help/intro

@@ -0,0 +1,55 @@
+Quick introduction
+
+    This is an interactive calculator which provides for easy large
+    numeric calculations, but which also can be easily programmed
+    for difficult or long calculations.  It can accept a command line
+    argument, in which case it executes that single command and exits.
+    Otherwise, it enters interactive mode.  In this mode, it accepts
+    commands one at a time, processes them, and displays the answers.
+    In the simplest case, commands are simply expressions which are
+    evaluated.  For example, the following line can be input:
+
+	    3 * (4 + 1)
+
+    and the calculator will print 15.
+
+    The special '.' symbol (called dot), represents the result of the
+    last command expression, if any.  This is of great use when a series
+    of partial results are calculated, or when the output mode is changed
+    and the last result needs to be redisplayed.  For example, the above
+    result can be doubled by typing:
+
+	    . * 2
+
+    and the calculator will print 30.
+
+    For more complex calculations, variables can be used to save the
+    intermediate results.  For example, the result of adding 7 to the
+    previous result can be saved by typing:
+
+	    old = . + 7
+
+    Functions can be used in expressions.  There are a great number of
+    pre-defined functions.  For example, the following will calculate
+    the factorial of the value of 'old':
+
+	    fact(old)
+
+    and the calculator prints 13763753091226345046315979581580902400000000.
+    Notice that numbers can be very large. (There is a practical limit
+    of several thousand digits before calculations become too slow.)
+
+    The calculator can calculate transcendental functions, and accept and
+    display numbers in real or exponential format. For example, typing:
+
+	    config("display", 50)
+	    epsilon(1e-50)
+	    sin(1)
+
+    prints "~.84147098480789650665250232163029899962256306079837".
+
+    The calculator also knows about complex numbers, so that typing:
+
+	    (2+3i) * (4-3i)
+
+    prints "17+6i".