## 2014年4月4日金曜日

### C - 高度な関数(関数ポインタの作成方法)

Head First C ―頭とからだで覚えるCの基本(David Griffiths (著)、Dawn Griffiths (著) 中田 秀基(監訳)(翻訳)、木下 哲也 (翻訳)、オライリージャパン)の7章(高度な関数)、エクササイズ(p.321)を解いてみる。

その他参考書籍

エクササイズ(p.321)

コード(BBEdit, Emacs)

sample321.c

```#include <stdio.h>
#include <string.h>

int NUM_ADS = 7;
char *ADS[] = {
"William: SBM GSHO likes sports, TV, dining",
"Matt: SUM NS likes art, movies, theater",
"Luis: SLM ND likes books, theater, art",
"Mike: DWM DS likes trucks, sports and bieber",
"Peter: SAM likes chess, working out and art",
"Josh: SJM likes sports, movies and theater",
"Jed: DBM likes theater, books and dining"
};

int sports_no_bieber(char *s)
{
return strstr(s, "sports") && !strstr(s, "bieber");
}

int sports_or_workout(char *s)
{
return strstr(s, "sports") || strstr(s, "working");
}

int ns_theater(char *s)
{
return strstr(s, "movies") && !strstr(s, "NS");
}

int arts_theater_or_dining(char *s)
{
return strstr(s, "art") || strstr(s, "theater") || strstr(s, "dining");
}

void find(int (*match)(char *))
{
int i;
puts("検索結果");
puts("------------------------------------");
for (i = 0; i < NUM_ADS; ++i)

puts("------------------------------------");
}

int main(int argc, char *argv[])
{
find(sports_no_bieber);
find(sports_or_workout);
find(ns_theater);
find(arts_theater_or_dining);

return (0);
}
```

Makefile

```all: sample321

sample321: sample321.c
cc -g -o sample321 sample321.c
```

```\$ make && ./sample321
cc -g -o sample321 sample321.c

------------------------------------
William: SBM GSHO likes sports, TV, dining
Josh: SJM likes sports, movies and theater
------------------------------------

------------------------------------
William: SBM GSHO likes sports, TV, dining
Mike: DWM DS likes trucks, sports and bieber
Peter: SAM likes chess, working out and art
Josh: SJM likes sports, movies and theater
------------------------------------

------------------------------------
Josh: SJM likes sports, movies and theater
------------------------------------

------------------------------------
William: SBM GSHO likes sports, TV, dining
Matt: SUM NS likes art, movies, theater
Luis: SLM ND likes books, theater, art
Peter: SAM likes chess, working out and art
Josh: SJM likes sports, movies and theater
Jed: DBM likes theater, books and dining
------------------------------------
\$
```