Tweaked the stream classes, added an example, and the begining of a formula

parser.

1 files changed, 50 insertions, 0 deletions

diff --git a/parex/evaltest.c b/parex/evaltest.c
new file mode 100644
index 0000000..7e8641e
--- /dev/null
+++ b/parex/evaltest.c
@@ -0,0 +1,50 @@
+/* 
+ *  EVALTEST.C - part of the EGG system.
+ *
+ *  Test program for the expression evaluator.
+ *
+ *  By Shawn Hargreaves.
+ */
+
+
+#define USE_CONSOLE
+
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+
+#include "egg.h"
+
+
+
+int main()
+{
+   char buf[256];
+   double result;
+   int error;
+
+   srand(time(NULL));
+
+   printf("\nTest program for the EGG expression evaluator module.\n\nEnter a formula, or a blank line to quit.\n\n\n");
+
+   for (;;) {
+      printf("> ");
+      fflush(stdout);
+
+      if (!fgets(buf, sizeof(buf), stdin) || (!buf[0]))
+         break;
+
+      result = evaluate(buf, &error, NULL);
+
+      if (error)
+         printf("\nError in expression!\n\n\n");
+      else 
+         printf("\nevaluate(\"%s\") = %f\n\n\n", buf, result);
+   }
+
+   printf("\n\n");
+
+   return 0;
+}
+