done 1.1

test.c

@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+void plus1(int *px)
+{
+    *px += 1;
+}
+
+int main()
+{
+    static int x = 5; 
+    static int *px = &x;
+    plus1(px);
+    printf('%d %d\n', x, x+1);
+
+    return 0;
+
+
+}