handle structures and member access

test.txt

@@ -1,5 +1,6 @@
 #!./main
 
+#include <math.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
@@ -9,14 +10,23 @@ int x = 21;
 
 int baz(int xx, ...) { return 42; }
 
-int   foo(void) { return x + x; }
+int foo(void) { return x + x; }
 
 char *bar(void) { return "bye bye"; }
 
+struct Point { float x, y; };
+
+struct Point pt;
+
+float Point_magnitude(struct Point p) { return sqrtf(p.x * p.x + p.y * p.y); }
+
+int gbl[5];
+
 int main(int argc, char **argv)
 {
     printf("hello, world %d %s\n", foo(), bar());
     printf("baz is %d %d %d\n", baz(1), baz(1, 2), baz(1, "two", 3));
+    printf("%d\n", 6*7);
     int x  = 42;
     int *p = &x;
     printf("x is %d p is %p\n", *p, p);
@@ -39,7 +49,7 @@ int main(int argc, char **argv)
     for (i = 0;  i < 5;  ++i) array[i] = i*i;
     for (i = 0;  i < 5;  ++i) printf("%d\n", array[i]);
 
-   for (i = 0;  i < 5;  ++i) array[i] = array[i] * array[i];
+    for (i = 0;  i < 5;  ++i) array[i] = array[i] * array[i];
     for (i = 0;  i < 5;  ++i) printf("%d\n", array[i]);
 
     printf("%p\n", array);
@@ -69,7 +79,22 @@ int main(int argc, char **argv)
     printf("%zd %s\n", sizeof(sarray), sarray);
     printf("%zd %s\n", sizeof(tarray), tarray);
     printf("%zd %s\n", sizeof(uarray), uarray);
-    // printf("%zd %s\n", sizeof(varray), varray); // unterminated string
+    printf("%zd %s\n", sizeof(varray), uarray); // varray has unterminated string
+
+    printf("gbl %f %f -> %f\n", pt.x, pt.y, Point_magnitude(pt)); // global data is filled with zero
+    pt.x = 3.0;
+    pt.y = 4.0;
+    printf("gbl %f %f -> %f\n", pt.x, pt.y, Point_magnitude(pt));
+
+    struct Point qt;
+    printf("lcl %f %f -> %f\n", qt.x, qt.y, Point_magnitude(qt)); // local data is random
+    qt.x = 3.0;
+    qt.y = 4.0;
+    printf("lcl %f %f -> %f\n", qt.x, qt.y, Point_magnitude(qt));
+
+    for (i = 0;  i < 5;  ++i) printf("g %d\n", gbl[i]); // global data is filled with zero
+    int lcl[5];
+    for (i = 0;  i < 5;  ++i) printf("l %d\n", lcl[i]); // local data is random
 
     printf("passed\n");