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STRUCT, TYPEDEF, ENUM & UNION• Since pPartPtr points to an object of type structinventory, we dereference the pointer to access the membersof the object using the following statements,(*pPartPtr).nPartNo(*pPartPtr).fBuyCost(*pPartPtr).fSellingPrice• Similar changes have been made to printpart() function.• Note, the parentheses are necessary here because the .operator has higher precedence than the indirection operator, *.• We must first dereference the pointer, and then select itsappropriate member.• Since, for efficiency, pointers to structures are often passed tofunctions, and, within those functions, the members of thestructures are accessed, the operation of dereferencing astructure pointer and a selecting a member is very common inprograms.www.tenouk.com, © 38/93
STRUCT, TYPEDEF, ENUM & UNION• As we have discussed previously, we can usearrow (->) operator instead of indirectionoperator (*) because,pPartPrt->nPartNo is equivalent to (*pPartPtr).nPartNo• The left hand expressions are equivalent ways ofwriting expressions on the right hand side.• Our code for readpart() could use thefollowing more readable alternative expressions,pPartPtr->nPartNopPartPtr->fBuyCostpPartPtr->fSellingPricewww.tenouk.com, © 39/93
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C struct, typedef, enum & union - Tenouk C & C++

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