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Pointer hopping used to be an important technique Optimizing compilers have made it generally unnecessaryStick to algorithmic issues for speed improvements and leave code generation to the compiler
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to s p , and we do not keep a counter i Thus we save an addition for each character, costing only an extra two subtractions during the return statement The next question is whether the trickier code is worth the time savings The answer is that in most programs a few subroutines dominate the total running time Historically, the use of trickier code for speed has been justified only for those routines that actually account for a significant portion of the program's running time or in routines used in enough different programs to make the optimization worthwhile Thus in the old days C programs that used pointer hopping judiciously had a large speed advantage over programs written in other high-level languages However good modern compilers can, in many cases, perform this optimization Thus the use of pointers to traverse arrays helps some compilers, is neutral for others, or may even generate slower code than the typical index addressing mechanism The moral of the story is that, in many cases, the best approach is to leave minute coding details to the compiler and concentrate on the larger algorithmic issues and on writing the clearest code possible Many systems have a profiler tool that allows you to decide where a program is spending most of its running time This information will help you decide where to apply algorithmic improvements, so learning how to use the optimizer and profiler on your system is important5
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5 But be warned of optimizer horror stories: some overly aggressive optimizers have bugs in them and actually break working code
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I Inthedeclaration i n t *a = new int[lOO],the sizeof operator gives a misleading result The size of a equals s izeof ( int* ) , and is typically four bytes 2 To define an array, the array size must be a compile-time constant expression Some compilers relax this rule, but this relaxation is not portable 3 Two-dimensional arrays are indexed as a [ iI [ jI , not a [ i , j I 4 When an array is deleted, you must use delete [ I , not merely de1ete Use the following general rules: Anything allocated by new requires delete, anything allocated by new[ 1 requires delete [ I , and anything else does not require delete 5 Continuing the previous rule, the sequence int a [ 101 ; delete [ 1 a ; is almost certain to cause problems because a was not allocated by new [ I
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Symbols #include, 6,493 5-6,29, A-30 = =, 5-6, 29, A-30 <, 5 +, +=, 14 - > operator, 28, 32 #ifndef, 49,85 #endif , 4 9 , 8 5 ::,50 ++, - -, 66 <<, >>, 68 <ctype A-23 h>, <cctype>, A-23 <limits h>,A-24 <climits>, A-24 <mathh>, A-25 <cmath>, A-25 <stdlibh>,A-26 <cstdlib>, A-26 &, A-41-42 [ 1 , A-41-42
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deletion, 688-690 insertion, 686-688 abstract class, 133-1 34, 149 abstract method, 133, 149 abstract queue class, 237 abstract stack class, 234 abstract tree iterator class, 624 accessors, 47, 85 Ackermann's function, 865, 873 activation records, 275-276,3 12 activity-node graph, 522, 524, 527 acyclic graphs See graphs and paths adapter class, 162, 170, 184 adapters, 169- 170 address of operator &, 15, 32 adjacency list, 492,497, 527 adjacency matrix, 49 1,527 adjacent vertices, 527 advance routine, 627-629,632-633,635 aggregates, 4, 33 algorithm analysis, 193-229 checking, 2 19-220 definition of, 193- 197 examples of running time, 198- 199 general Big-Oh rules, 206-21 1 limitations of Big-Oh analysis, 220 the logarithm, 2 1 1-2 14 maximum contiguous subsequence sum problem, 199-206 static searching problem, 2 14-2 18
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