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Even worse, p t r could be pointing at an address Pointers must be pointing at an Object before dereferencing. 8 X Y Uninitialized pointer. that is accessible: in which case the program will not crash immediately, but it will be erroneous. If * p t r is the target of an assignment, then we would be accidentally changing some other data, which could result in a crash at a later point. This is a tough error to detect because the cause and symptom may be widely separated in time. We have already shown the correct syntax for the assignment: p t r = &x; / / LEGAL Suppose that we forget the address-of operator.

In C++, arrays are always indexed starting at zero. Thus the declaration vectorcintl a ( 3 ) ; / / 3 int objects: a [ O l , a [ l l , and a [ 2 1 sets aside space to store three integers-namely, a [ 0 1 , a [ 11,and a [ 2 1 ; no index range checking is performed in the Standard Library's vector,so an access out of the array index bounds is not caught by the compiler (in this case, the legal array indices range from 0 to 2, inclusive). Although no explicit run-time error may be generated, undefined and occasionally mysterious behavior would occur.

3. Line 13 resizes the vector to no elements. Note that if we do not resize, then new items will be placed at the end of the vector;thus items that were in the vector when getInts was called will still be there. 5 Parameter-Passing Mechanisms Suppose that we want to pass a vector to a routine that finds the maximum \ alue in the array. The natural declaration for the routine would be 6. Some compilers do not double the capacity. but instead expand by a small constant amount, thereby causing poor performance.

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