add calkBT

Homework/bintreeCalk/main.c

@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <string.h>
+#include <time.h>
+#include <error.h>
+#include "head.h"
+
+int main(int argc, char *argv[])
+{
+    char s[SIZE];
+    Tree *tree = NULL;
+    if (argc < 2)
+    {
+        printf("no expression\n");
+        return 2;
+    }
+    strcpy(s, argv[1]);
+    printf("processing %s\n", s);
+    tree = maketree(s, 0, strlen(s) - 1);
+
+    printf("\n tree: \n");
+    showtree(tree, 0);
+
+    printf("= %d \n", calculate(tree));
+    return 0;
+}