Some pointer arithmetic is allowed. Which of the following arithmetic operators is allowed?
a) pointer + integer
b) pointer - pointer
c) pointer - integer
d) integer + pointer
e) integer * pointer
a) pointer + integer , b) pointer - pointer , c) pointer - integer , and d) integer + pointer
In a) and d), a number, equal to the product of the integer and the size of the object pointed to, is added to the pointer. In c), things are similar to a) and d) except that the number is subtracted from the pointer. e) Neither multiplication of pointers or of pointers by integers is allowed. In c), the two pointers must point into the same data structure.
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