// test: echo "95 - 6.3 * 15 - 1" | calc.exe | grep -q '=> -5.000028e-1'
// test: echo "95-6.3+15" | calc.exe | grep -q '=> 1.037e2'
// test: echo "-cos (0) + 1" | calc.exe | grep -q '=> 0'
+// test: echo "quit" | calc.exe | grep -q 'bye'
+// test: echo "help" | calc.exe | grep -q 'miscellaneous'
/* vim: set ts=4 sw=4 et: */
{ "^", Pow, 2, 1, 4}
};
-#define NB_FUNCTIONS 7
+#define NB_FUNCTIONS 9
keyword_t functions[NB_FUNCTIONS] = {
{ "sqrt", Sqr, 1, 4, 5},
{ "pow", Pow, 2, 3, 5},
{ "sin", Sin, 1, 3, 5},
{ "atan", Atn, 1, 4, 5},
{ "exp", Exp, 1, 3, 5},
- { "log", Log, 1, 3, 5}
+ { "log", Log, 1, 3, 5},
+ { "quit", Qui, 0, 4, 5},
+ { "help", Hel, 0, 4, 5}
};
/* subparser function */
switch (root->func) {
case Val: func = "Value"; break;
+ case Sig: func = "Sign"; break;
case Add: func = "Addition"; break;
case Sub: func = "Subtraction"; break;
case Mul: func = "Multiplication"; break;
case Atn: func = "Arc Tangent"; break;
case Log: func = "Logarithm"; break;
case Exp: func = "Exponantial"; break;
- case Sig: func = "Sign"; break;
+ case Qui: func = "Quit"; break;
+ case Hel: func = "Help"; break;
}
PRINTOUT ("Function: %s\n", func);
}
}
-#define MASK_SUB 0x1
-#define MASK_DIV 0x2
+/* quit function */
+
+void quit (void)
+{
+ PRINTOUT ("bye\n");
+ exit (0);
+}
+
+/* help message */
+
+void help (void)
+{
+ PRINTOUT ("calc is a simple calculator\n\n");
+ PRINTOUT ("supported operators:\n");
+ PRINTOUT (" + - * / % ^\n\n");
+ PRINTOUT ("supported functions:\n");
+ PRINTOUT (" pow sqrt cos sin atan log exp\n\n");
+ PRINTOUT ("miscellaneous functions:\n");
+ PRINTOUT (" quit help\n");
+}
/* evaluate element tree */
+#define MASK_SUB 0x1
+#define MASK_DIV 0x2
+
double evaluate_element (element_t *root, char mask)
{
double op0 = 0, op1 = 0;
VERBOSE (WARNING, PRINTOUT ("error while evaluating (op[0])\n"));
return 0;
}
+ break;
+ case Qui:
+ case Hel:
+ break;
}
switch (root->func) {
case Atn: return atan (op0);
case Log: return log (op0);
case Exp: return exp (op0);
+ case Qui: quit (); break;
+ case Hel: help (); break;
}
return 0;