A Computer Science Tapestry: Errata

added September 9

• The function main in Program 2.4 (page 43) needs a call of Sides() added after the Eyes() call: int main() { Hair(); Sides(); Sides(); Sides(); Eyes(); Sides(); // the additional line Ears(); Smile(); Sides(); Sides(); Sides(); return 0; }

added August 21

• Page 236, Exercise 5.8, prototype should be as follows: int NumDigits(int num); The int type for the parameter num is missing.

added August 13

• The Date class had a bug on PCs and Macs because of int/long int problem. Only addition of dates and longs were affected, this is now fixed. An additional operator to subtract two dates was added to the date class.

Initial posting of errata, August 11, 1997.

• page 84, Figure 3.1 both left- and right-hand side, there is a statement before the call of function Verse: cin << endl; that should read cout << endl;

• Page 57, Figure 2.11, the function call Had(animal) should be HadA(animal): note use of HadA.

• In the Output box at the bottom of page 57, a comma is missing between hen and everywhere on the last line. On the first line the second ee-igh should be capitalized as Ee-igh.

• Program 3.1, macinput.cc, on page 83, a variable is defined as sting noise, this should be string noise.

• On page 91, in the code-fragment explaining / and % at the top of the page, the number 147 should be replaced by 1347.

• On page 103, in the comments that document the file balloon.h, Program 103, for the function Descend, replace the word vet with vent.

  For the function GetLocation (page 104) the comment should read (the word 'many' was missing):

  // returns how many cruise "steps" taken

• On page 115, in the listing of Program 4.2, change2.cc, the cout ... statement in function Output should be terminated by a semi-colon and not a colon.

• Page 138, second to last paragraph, the function SlicePrice from Program 4.7 is mentioned, this should be function Cost (the SlicePrice is from Program 3.5, pizza.cc on page 96).

• The program prompt.h (Program 4.11 on page 146) is labelled as prompt.cc.

• In exercise 4.7 on page 156, a discussion of a "boolean valued int data field" is given. Rather than an int, a bool data field should be used and initialized to false instead of 0.

• Page 158, on the fifth line up from the bottom, the "0" should be replaced by "person".

• Program 4.16 on page 167 should be labeled as ctimer.h rather than ctimer.cc.

• The output box on page 186 for Program 5.5, rollsum.cc, shows a prompt that isn't consistent with the prompt in the program listing. The output box should show: prompt> rollsum enter target to roll: 7 number of rolls needed to get 7 = 11 prompt> rollsum enter target to roll: 7 number of rolls needed to get 7 = 1

• In the portion of program 5.10, digits.cc that appears on page 206, the line number / 10; should be number /= 10;

• On page 211, in the comparison of the while loop and the for loop, the first line of the for loop body is missing, the complete loop is: for(; number != 0; number /= 10) { digit = number % 10; s = DigitToString(digit) + " " + s; }

• In the listing of calendar.cc, Program 5.17, on page 247, the literal "Sunday" in the loop at the end of the function Calendar should be "Saturday", this is corrected in the online code.

• On page 250 at the bottom of the page in the discussion of calling the member function Absolute, the operator += should be replaced by operator ++ since the implementation of operator += is not shown on this page.

• On page 299, a reference to list.h as given in the appendix is made. The listing of list.h was removed prior to printing, the file is accessible from the online program listings.

• In the output box on page 311, the next-to-last line should not be there.

• In Program 9.3, lines.cc on page 439, the first #include is mistakenly typeset as #included (note the extra d).

• On page 492, the paragraph after the listing of function Power refers to a call Power(2,21) which should be Power(3,21) (the 2 should be replaced by a 3).
• In the comments from matrix.h reproduced on page 553, there should be a comma after the parameter cols in the third Matrix constructor (this is in the comment only).

• In the version of bigint.cc originally available on the web, the roles of parameters lhs and rhs were reversed. This did not affect the correctness of the code because + is commutative, but the code wasn't consistent with other operators. This has been fixed in the code that's online now.

• In the calls to C-style string function strlen in CPstring.cc (the implementation of the string class used in the book) compilation warnings will be issued when comparing the result returned by strlen (which is of type size_t) to an int. Casting the result returned to an int removes the warning, this has been done in the online CPstring.cc accessible from the web pages.