Web hosting comparison - Chapter 7 Arrays 239 To divide the value
Chapter 7 Arrays 239 To divide the value of the seventh element of array cby 2and assign the result to the variable x, we would write x= c[ 6] / 2; Common Programming Error 7.1 It is important to note the difference between the seventh element of the array and array element seven. Array subscripts begin at 0, thus the seventh element of the array has a subscript of 6, while array element seven has a subscript of 7 and is actually the eighth element of the array. This confusion is a source of off-by-one errors. The brackets that enclose the subscript of an array are operators. Brackets have the same level of precedence as parentheses. The chart in Fig. 7.2 shows the precedence and associativity of the operators introduced to this point in the text. They are displayed top to bottom in decreasing order of precedence, with their associativity and type. The reader should note that the ++ and — operators in the first row represent the postincrement and postdecrement operators, while the ++ and –operators in the second row represent the preincrement and predecrement operators. Also, notice that in the first row the associativity is mixed. This is because the associativity of the postincrement and postdecrement operators is right to left, while the associativity for the other operators is left to right. 7.3 Declaring and Allocating Arrays Arrays occupy space in memory. The programmer specifies the type of the elements and uses operator new to allocate dynamically the number of elements required by each array. Arrays are allocated with new because arrays are objects and all objects must be created with new. We will see an exception to this rule shortly. Operators Associativity Type () [] . ++ –left to right highest (unary postfix) ++ — + - ! (type) right to left unary (unary prefix) * / % left to right multiplicative + -left to right additive < <= > >= left to right relational == != left to right equality & left to right logical AND ^ left to right logical exclusive OR | left to right logical inclusive OR && left to right conditional AND || left to right conditional OR ?: right to left conditional = += -= *= /= %= right to left assignment Fig. 7.2 Precedence and associativity of the operators discussed so far.
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