From 239a885d441cdb3585c42b594ed9e87b37b33c62 Mon Sep 17 00:00:00 2001 From: zlg Date: Wed, 27 Mar 2013 05:00:43 -0500 Subject: Solve Exercise 2-5: The any() function --- ch2/2-05_any-func.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 ch2/2-05_any-func.c (limited to 'ch2') diff --git a/ch2/2-05_any-func.c b/ch2/2-05_any-func.c new file mode 100644 index 0000000..c515fab --- /dev/null +++ b/ch2/2-05_any-func.c @@ -0,0 +1,44 @@ +#include + +/* The C Programming Language: 2nd Edition + * + * Exercise 2-5: Write the function any(s1,s2), which returns the first + * location of the string s1 where any character from the string s2 occurs, or + * -1 if s1 contains no characters from s2. (The standard library function + * strpbrk does the same job but returns a pointer to the location.) + * + * Answer: Similarly to squeeze(), any() uses two loops to do its job, but + * instead of changing the string, we're just returning the index of the first + * character found. If it's not found, it'll return a negative number. This + * is a common practice in functions that return integers since it gives + * programmers an easy case to check for: if any() returns anything less than + * zero, the characters in s2 weren't found. + * + */ + +int any(char s1[], char s2[]) { + int i, j; + for (i = j = 0; s1[i] != '\0'; ++i) { + while (s2[j++] != '\0') { + if (s1[i] == s2[j]) { + return i; + } + } + j = 0; + } + return -1; +} + +int main() { + char foo[80] = "argle bargle"; + char bar[80] = "toobz"; + int result; + + if ((result = any(foo, bar)) != -1) { + printf("Found a match at position %d!\n", result); + } else { + printf("No match found.\n"); + } + // Should return a match at index 6. + return 0; +} -- cgit v1.2.3-70-g09d2 v0.3b5'/>
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etions'>-17/+107
AgeCommit message (Collapse)AuthorFilesLines
2018-09-08Add remaining filters to vgstash packagezlg1-2/+11
2018-09-04Update LICENSE to match setup.pyzlg1-80/+67
Whoops.
2018-09-03Branch off from master with pytest, tox, clickzlg16-778/+779
This commit is huge, but contains everything needed for a "proper" build system built on pytest + tox and a CLI built with click. For now, this branch will contain all new vgstash development activity until it reaches feature parity with master. The CLI is installed to pip's PATH. Only the 'init', 'add', and 'list' commands work, with only two filters. This is pre-alpha software, and is therefore not stable yet.
2018-03-18Flesh out filter types and ownership statuszlg3-82/+144
It's time for a refactor to a module; the functionality and interface are clashing.
2018-03-18README.mdown: break line correctlyzlg1-1/+1
2018-03-18add 'playlog' list filterzlg2-2/+9
This filter is used to get an idea of which games you're currently playing through, so you can prioritize games to play when you're bored and detect it when you've beaten a game but haven't marked it as such.
2018-03-13Update helpers a bitzlg1-2/+9
At present, user modification is needed to make these seamless. vgup() may need to be axed in favor of telling the user to make an alias.
2018-03-13Make VGSTASH_DB_LOCATION point to a filezlg2-21/+20
It used to point to a directory, which would then look for .vgstash.db. This behavior was kind of backwards and I don't remember why I did it that way. This change gives users more control over where they put their DB. Be sure to update your environment variable if you have it set!
2016-11-18Remove settings from helpers.shZe Libertine Gamer1-5/+0
Sourcing them in .bash_profile screws up login if they're set.
2016-11-15Correct phrasing in README.Ze Libertine Gamer1-4/+4
2016-11-13DerpZe Libertine Gamer1-0/+1
2016-11-03Improve error handling in shell scriptsZe Libertine Gamer4-3/+23
2016-10-24Correct run_again, add recursionZe Libertine Gamer1-0/+4
Loops and functions -- oh my, what a useful combination. :)
2016-10-21Add quotes to correct behavior for arglistZe Libertine Gamer1-1/+1
2016-10-14updater.sh: add recursion, error handlingZe Libertine Gamer1-43/+101
2016-10-14Correct pipe-handling behaviorZe Libertine Gamer1-1/+9
2016-10-12Clarify a method to move between platformsZe Libertine Gamer1-2/+5
Also correct a typo.
2018-09-08setup.py: Bump to alpha4 for PyPIzlg1-1/+1
2018-09-08cli: add '--raw' option to list commandzlg2-9/+45
2018-09-08Add remaining filters to vgstash packagezlg1-2/+11
2018-09-04Update LICENSE to match setup.pyzlg1-80/+67
2018-09-03Branch off from master with pytest, tox, clickzlg16-778/+779
2018-03-18Flesh out filter types and ownership statuszlg3-82/+144
2018-03-18README.mdown: break line correctlyzlg1-1/+1
2018-03-18add 'playlog' list filterzlg2-2/+9
2018-03-13Update helpers a bitzlg1-2/+9
2018-03-13Make VGSTASH_DB_LOCATION point to a filezlg2-21/+20
2016-11-18Remove settings from helpers.shZe Libertine Gamer1-5/+0
2016-11-15Correct phrasing in README.Ze Libertine Gamer1-4/+4
2016-11-13DerpZe Libertine Gamer1-0/+1
2016-11-03Improve error handling in shell scriptsZe Libertine Gamer4-3/+23
2016-10-24Correct run_again, add recursionZe Libertine Gamer1-0/+4
2016-10-21Add quotes to correct behavior for arglistZe Libertine Gamer1-1/+1
2016-10-14updater.sh: add recursion, error handlingZe Libertine Gamer1-43/+101
2016-10-14Correct pipe-handling behaviorZe Libertine Gamer1-1/+9
2016-10-12Clarify a method to move between platformsZe Libertine Gamer1-2/+5