test06.cpp: In function 'void func1(int*)':
test06.cpp:12:13: warning: Using variable 'a' without checking for null pointer
     *a = 100;
             ^
test06.cpp: In function 'void func5(int*)':
test06.cpp:45:13: warning: Using variable 'a' without checking for null pointer
     *a = 600;
             ^
test06.cpp: In function 'void func7(int*)':
test06.cpp:70:16: warning: Using variable 'aptr' without checking for null pointer
     *aptr = 800;
                ^