errata.txt

传说中的c语言四书五经：一、The C Programming Language C程序设计语言（第2版·新版） 二、Pointers on C C和指针 三、Expert C Progra

Errata for Pointers on C

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Please send errata to  -- thanks! 

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Errors corrected in the second printing: 
Page ix: The correct URL is http://www.awl.com/cseng/titles/0-673-99986-6/. 
Page 26, Figure 2.1: The bottom object, labelled "Object code", should be labelled "Executable." 
Page 463: The description of difftime should mention that the result is computed by subtracting time1 - time2. 
Page 576: The answer for the expression &ints[-2] should be illegal. 
Page 584: The answer for the expression &nodes should be 200. 

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Errors corrected in the third printing: 
Page 52: In the first line after the example in the Tip, change "an integer" to "a character". 
Page 64: The fourth paragraph should begin like this: "Lines 19 and 20 create local variables (automatic, no linkage, scope limited to this block)." 
Page 64: The first line of the last paragraph before the summary should begin: "Finally, line 25 declares ..." 
Page 96 & 100: The text describes Programs 5.1 and 5.2 as using a right shift, but in fact they mistakenly use a left shift. Be sure to fix this because the functions don't work as shown! 
Page 176: The last sentence should read, "... static keyword to restrict the accessibility of ..." 
Page 211: The last paragraph on this page should begin as follows: "Note the expression *string++ in the while statement. It gets the character to which ..." 
Page 229, fifth sentence in the first new paragraph on the page: "The calling program must know that zero means do, one means for, ..." 
Page 236: The declaration in problem 13 should be int array[4][5][3]; 

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The errors below have not yet been corrected. I've organized this list by the date each error was reported to me; this makes it easier to see what has been added since the last time you checked the list. 
11/6/97 Page 430: The description of the printf family should state that all three functions return a count of the number of characters printed or stored. 
3/21/98 Page 39: The last sentence should begin "Long integers are at least ..." 
3/21/98 Page 199: 4 lines up from the bottom: the accent on "voila" is backwards. 
3/21/98 Page 217, third paragraph from the bottom: The second sentence should read, "Does matrix have six rows of ten columns each, or ten rows of six columns each?" 
3/21/98 Page 610: Add an entry to the index: automatic 59, 213 
3/21/98 Page 612: In the index entry for function, change 167 to 165. 
12/9/98 Page 612: In index entry for exit, add page 410 as the primary reference. 
6/6/99 Page 575: The solution to programming problem 7-3 is incorrect. The declaration for digit should be deleted, and the statement string++; should be added to the end of the while loop. 
2/2/00 Page 308: In program 11.1b, the string literal in the printf should end with \n rather than \en. 
3/13/00 Page 263: In exercise 11, the comparison should be case dependent, not case independent. 
6/17/00 Page 64, last line before section 3.10: Function d can indeed call function i, but there will be no type checking on the arguments due to the lack of a prototype. 
6/17/00 Page 169, 4 lines up from the bottom: omit the duplicate "the". 
6/17/00 Page 178, last line: change "lookup_entry" to "find_entry". 
6/17/00 Page 193, 3rd line: Remove the first occurrence of "it". 
6/17/00 Page 193, 2nd line from the bottom: "ellipsis" is spelled wrong. 
1/29/01 Page 198, 3rd paragraph (just before the example): In the sentence that begins "Taking the address of an array gives a pointer to", change "the first element in the array." to "the array (pointers to arrays are discussed in section 8.2.2 and 8.2.3)." 
10/25/01 Page 42, line 16: Change "apostrophies" to "apostrophes". 
12/5/01 Page 463, table 16.2: The range for tm_mday should be 1-31, not 0-31. 
12/10/01 Page 256, table 9.1: In the line for isspace, the words "carriage return" should be followed by: '\r'. 
3/7/02 Page 195, problem 1: The subscripts are broken in the line for n >= 2. It should read "2xH sub [n-1] (x) - 2(n-1)H sub [n-2] (x)". 
3/7/02 Page 196, problem 3: In the last sentence after the phrase "multiply the value you have so far" add the words "by ten" 
9/18/02 Page 212, second tip: After writing the tip, I seem to have followed by own advice and removed the register declarations from the function to let the compiler optimize it on its own. I also eliminated the local variable. The tip itself makes a valid point, but the example doesn't illustrate it very well. 
9/18/02 Pages 229 & 230: the last block of the "register" string should contain just a 0, not '0. 
9/18/02 Page 576, problem 8-8: Starting with the second sentence, the answer should read: "But a is actually where the array of integers begins, so the value obtained as the "pointer" will be the value of the first integer in the array." 
10/1/02 Page 311, just before the 3rd exit( EXIT_FAILURE ): add the line free( array ); to fix the memory leak. 
10/28/02 Page 466, section 16.4.1 and program 16.2: The Standard states that setjmp can only be used as the entire controlling expression of an iteration or selection statement (optionally with a !, or a relational or equality operator and an integral constant expression), or as the entire expression in an expression statement. In program 16.2, I separated the call to setjmp and the test of its result in order to better explain each with its own comment. However, assigning the value of setjmp to a variable violates this rule, so the program should be: 
switch( setjmp( restart ) ){

10/28/02 Page 198 and 231: If x is an array name, the expression &x generates a pointer to the array, not a pointer to the first element. While these values are numerically equal, they have different types. 
4/22/03 Page 475: The prototype for the atexit function should be: 
void atexit( void (*func)( void ) );

4/22/03 Page 477: The prototype for the system function should be: 
int system( char const *command );

5/23/03 Page 294: The first line of code after the "else" should be: 
y = rec.info.subassy.n_parts;

5/23/03 Page 584: The answer to the 11th expression in problem 10.7 should be: 
{ 18, nodes+2, nodes+1 }

3/8/04 Page 43: The second line of the first example should be: 
value = value - 060;