Stanley B Lippman; Safari Tech Books Online's Essential C : Includes and index PDF

By Stanley B Lippman; Safari Tech Books Online

ISBN-10: 0201485184

ISBN-13: 9780201485189

ISBN-10: 0201615622

ISBN-13: 9780201615623

ISBN-10: 0201824701

ISBN-13: 9780201824704

ISBN-10: 0201834545

ISBN-13: 9780201834543

ISBN-10: 0201889544

ISBN-13: 9780201889543

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Additional info for Essential C : Includes and index

Example text

Who said programming is fun? vector before about to call about to call about to call about to call about to call about to call about to call about to call about to call about to call about to call about to call about to call about to call sort: swap! swap! swap! swap! swap! swap! swap! swap! swap! swap! swap! swap! swap! swap! 8 34 ix: 0 ix: 0 ix: 0 ix: 0 ix: 1 ix: 1 ix: 1 ix: 1 ix: 1 ix: 1 ix: 2 ix: 2 ix: 3 ix: 3 3 13 1 21 5 2 jx: 2 swapping: jx: 4 swapping: jx: 6 swapping: jx: 7 swapping: jx: 2 swapping: jx: 3 swapping: jx: 4 swapping: jx: 5 swapping: jx: 6 swapping: jx: 7 swapping: jx: 4 swapping: jx: 7 swapping: jx: 4 swapping: jx: 6 swapping: 36 8 with 3 8 with 1 8 with 5 8 with 2 34 with 3 34 with 13 34 with 1 34 with 21 34 with 5 34 with 2 3 with 1 3 with 2 13 with 1 13 with 5 about to call swap!

If both pairs represent the same two objects, then changing val1 and val2 within swap() should change the values within vec[ix] and vec[jx]. But this is not what is happening. It is as if we were manipulating two different pairs of objects that have no relationship to each other except that both pairs hold the same values. This, in fact, is exactly what is happening. It explains why even though we swap the values, the change is not reflected in the vector. In effect, the objects passed to swap() are copied, and there is no relationship between the two pairs of objects.

Jx begins at ix+1 and ends at size-1. It compares the element value at ix with the element value at jx. If the element value at jx is smaller, the two element values are swapped. Our first implementation fails. The purpose of this section is to explain why. Here we go. size(); ++jx) if (vec[ix] > vec[jx]) swap(vec[ix], vec[jx]); } int main() { int ia[8] = { 8, 34, 3, 13, 1, 21, 5, 2 }; vector vec(ia, ia+8); cout << "vector before sort: "; display(vec); bubble_sort(vec); cout << "vector after sort: "; 35 display(vec); } When this program is compiled and executed, the following output is generated, showing that the vector defined within main() is not sorted: vector before sort: 8 34 3 13 1 21 5 2 vector after sort: 8 34 3 13 1 21 5 2 It's not unusual to have a program not work the first time we run it.

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Essential C : Includes and index by Stanley B Lippman; Safari Tech Books Online


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