a pointer is non-zero (GOOD)
a value (should be 12): 12
b pointer is non-zero (GOOD)
a pointer is zero (GOOD)
b value (should be 12): 12
b pointer is non-zero (GOOD)
b value (should be 7): 7
c pointer is non-zero (GOOD)
c value (should be 5): 5
c pointer is zero (GOOD)