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Capítulo 5: Apuntadores y arreglos
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5.1. Apuntadores y direcciones
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No hay ejercicios.
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5.2. Apuntadores y argumentos de funciones
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5.1.
Exercise 5-1. 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.
Exercise 5-2. Write getfloat, the floating-point analog of getint.
What type does getfloat return as its function value?
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5.3 Apuntadores y arreglos
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5.4 Aritmética de direcciones
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5.5 Apuntadores a carácter y funciones
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Exercise 5-3. 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.
Exercise 5-4. Write the function strend(s,t), which returns 1 if the
string t occurs at the end of the string s, and zero otherwise.
Exercise 5-5. 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.
Exercise 5-6. 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).
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5.6 Arreglos de apuntadores; Apuntadores a apuntadores
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Exercise 5-7. Rewrite readlines to store lines in an array supplied by
main, rather than calling alloc to maintain storage. How much faster
is the program?
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5.7 Arreglos multidimensionales
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Exercise 5-8. There is no error checking in day_of_year or month_day.
Remedy this defect.
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5.8 Inicialización de arreglos de apuntadores
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No hay ejercicios.
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5.9 Apuntadores vs. arreglos multidimensionales
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Exercise 5-9. Rewrite the routines day_of_year and month_day with
pointers instead of indexing.
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5.10 Argumentos de la línea de comandos
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Exercise 5-10. 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 * (3+4).
Exercise 5-11. Modify the program 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.
Exercise 5-12. 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.
Exercise 5-13. Write the program tail, which prints the last n lines
of its input. By default, n is set to 10, let us 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.
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5.11 Apuntadores a funciones
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Exercise 5-14. Modify the sort program to handle a -r flag, which
indicates sorting in reverse (decreasing) order. Be sure that -r works
with -n.
Exercise 5-15. 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.
Exercise 5-16. Add the -d (``directory order'') option, which makes
comparisons only on letters, numbers and blanks. Make sure it works in
conjunction with -f.
Exercise 5-17. Add a field-searching capability, so sorting may bee
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.)
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5.12 Declaraciones complicadas
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Exercise 5-18. Make dcl recover from input errors.
Exercise 5-19. Modify undcl so that it does not add redundant
parentheses to declarations.
Exercise 5-20. Expand dcl to handle declarations with function
argument types, qualifiers like const, and so on.
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