Chapter 5 - Pointers and Arrays

Ex No	Pg No	Exercise	Solution	Solved by
1	97	As written, getint treats a + or - not followed by a digit as a valid representation of zero. Fix it to push such a character back on the input.	Listing krx501	Gregory Pietsch
2	97	Write getfloat , the floating-point analog of getint . What type does getfloat return as its function value?	Listing krx502	Chris Mears, Gregory Pietsch
3	107	Write a pointer version of the function strcat that we showed in Chapter 2: strcat(s,t) copies the string t to the end of s .	Listing krx503	Richard Heathfield
4	107	Write the function strend(s,t) , which returns 1 if the string t occurs at the end of the string s , and zero otherwise.	Listing krx504	Bryan Williams
5	107	Write versions of the library functions strncpy , strncat , and strncmp , which operate on at most the first n characters of their argument strings. For example, strncpy(s,t,n) copies at most n characters of t to s . Full descriptions are in Appendix B.	Listing krx505	Lars Wirzenius
6	107	Rewrite appropriate programs from earlier chapters and exercises with pointers instead of array indexing. Good possibilities include getline (Chapters 1 and 4), atoi , itoa , and their variants (Chapters 2, 3, and 4), reverse (Chapter 3), and strindex and getop (Chapter 4).	Listing krx506	Gregory Pietsch
7	110	Rewrite readlines to store lines in an array supplied by main , rather than calling alloc to maintain storage. How much faster is the program?	Listing krx507	Steven Huang
8	112	There is no error-checking in day_of_year or month_day. Remedy this defect.	Listing krx508	Lars Wirzenius
9	114	Rewrite the routines day_of_year and month_day with pointers instead of indexing.	Listing krx509	Lars Wirzenius, Gregory Pietsch
10	118	Write the program expr , which evaluates a reverse Polish expression from the command line, where each operator or operand is a separate argument. For example, expr 2 3 4 + * evaluates 2 x (3+4).	Listing krx510	Lars Wirzenius
11	118	Modify the programs entab and detab (written as exercises in Chapter 1) to accept a list of tab stops as arguments. Use the default tab settings if there are no arguments.	Listing krx511	Gregory Pietsch
12	118	Extend entab and detab to accept the shorthand entab -m +n to mean tab stops every n columns, starting at column m . Choose convenient (for the user) default behavior.	Listing krx512	Franz Fritsche
13	118	Write the program tail, which prints the last n lines of its input. By default, n is 10, say, but it can be changed by an optional argument, so that tail -n prints the last n lines. The program should behave rationally no matter how unreasonable the input or the value of n. Write the program so it makes the best use of available storage; lines should be stored as in the sorting program of Section 5.6, not in a two-dimensional array of fixed size.	Listing krx513	Gregory Pietsch, Steven Huang
14	121	Modify the sort program to handle a -r flag, which indicates sorting in reverse (decreasing) order. Be sure that -r works with -n.	Listing krx514	Steven Huang, Franz Fritsche
15	121	Add the option -f to fold upper and lower case together, so that case distinctions are not made during sorting; for example, a and A compare equal.	Listing krx515	Franz Fritsche
16	121	Add the -d ("directory order") option, which makes comparisons only on letters, numbers and blanks. Make sure it works in conjunction with -f .	Listing krx516	Barrett Drawdy
17	121	Add a field-handling capability, so sorting may be done on fields within lines, each field sorted according to an independent set of options. (The index for this book was sorted with -df for the index category and -n for the page numbers.)	Listing krx517	Robert Taylor
18	126	Make dcl recover from input errors.	Listing krx518	Robert Taylor
19	126	Modify undcl so that it does not add redundant parentheses to declarations.	Listing krx519	Robert Taylor
20	126	Expand dcl to handle declarations with function argument types, qualifiers like const , and so on.	Listing krx520	codybartfast