handle array indexing and integer multiplication

Makefile

@@ -15,10 +15,10 @@ test : main
 	./main -vv test.txt
 
 demo : main
-	for i in demofiles/*.c; do echo $$i; ./main -x < $$i;  done
+	for i in demofiles/*.c; do echo $$i; ./main $$i;  done
 
 demov : main
-	for i in demofiles/*.c; do echo $$i; ./main -x -vv < $$i;  done
+	for i in demofiles/*.c; do echo $$i; ./main -vv $$i;  done
 
 spotless : clean
 	rm -rf *~ *.dSYM

demofiles/segmentation-fault.c

@@ -3,7 +3,7 @@
 #include <stdio.h>
 
 int main() {
-  int *ptr = NULL;
+    int *ptr = (void *)0; // NULL;
   *ptr = 42;
   return 0;
 }

demofiles/use-after-free.c

@@ -6,7 +6,7 @@
 
 int main() {
   int *ptr = malloc(sizeof(*ptr));
-  assert(ptr);
+  assert(ptr != 0);
   *ptr = 42;
   free(ptr);
   printf("%d\n", *ptr);	// use after free

test.txt

@@ -30,6 +30,13 @@ int main(int argc, char **argv)
     while (x > 0) printf("%d ", --x);
     printf("\n");
     printf("%d\n", sizeof(char *));
+
+    int array[5];
+    printf("array size %d\n", sizeof(array));
+    int i;
+    for (i = 0;  i < 5;  ++i) array[i] = i*i;
+    for (i = 0;  i < 5;  ++i) printf("%d\n", array[i]);
+
     return 0;
 }