開発環境
- OS X Lion - Apple(OS)
- Emacs、BBEdit - Bare Bones Software, Inc. (Text Editor)
- プログラミング言語: C
- Clang (コンパイラ)
プログラミング言語C 第2版 ANSI規格準拠 (B.W. カーニハン D.M. リッチー (著)、 石田 晴久 (翻訳)、共立出版)の第1章(やさしい入門)、1.9(文字配列)の演習 1-16、1-17、1-18、1-19を解いてみる。
その他参考書籍
- プログラミング言語Cアンサー・ブック 第2版 (クロビス・L．トンド、スコット・E．ギンペル(著)、矢吹 道郎(翻訳))
演習 1-16.
コード
sample.c
#include <stdio.h>
#define MAXLINE 1000
int my_getline(char line[], int maxline);
void copy(char to[], char from[]);
int main()
{
int len;
int max;
char line[MAXLINE];
char longest[MAXLINE];
max = 0;
while ((len = my_getline(line, MAXLINE)) > 0) {
printf("%d, %s", len, line);
if (len > max) {
max = len;
copy(longest, line);
}
}
if (max > 0)
printf("%s", longest);
return 0;
}
int my_getline(char s[], int lim)
{
int c, i, j;
j = 0;
for (i = 0; (c = getchar()) != EOF && c !='\n'; ++i)
if (i < lim - 2) {
s[j] = c;
++j;
}
if (c == '\n') {
s[j] = c;
++i;
++j;
}
s[j] = '\0';
return i;
}
void copy(char to[], char from[])
{
int i;
i = 0;
while ((to[i] = from[i]) != '\0')
++i;
}
入出力結果(Terminal)
$ cat sample.c | ./a.out
19, #include <stdio.h>
21, #define MAXLINE 1000
1,
42, int my_getline(char line[], int maxline);
35, void copy(char to[], char from[]);
1,
11, int main()
2, {
13, int len;
13, int max;
24, char line[MAXLINE];
27, char longest[MAXLINE];
5,
13, max = 0;
52, while ((len = my_getline(line, MAXLINE)) > 0) {
37, printf("%d, %s", len, line);
25, if (len > max) {
23, max = len;
33, copy(longest, line);
10, }
6, }
17, if (max > 0)
31, printf("%s", longest);
14, return 0;
2, }
1,
34, int my_getline(char s[], int lim)
2, {
17, int c, i, j;
5,
11, j = 0;
58, for (i = 0; (c = getchar()) != EOF && c !='\n'; ++i)
27, if (i < lim - 2) {
22, s[j] = c;
17, ++j;
10, }
21, if (c == '\n') {
18, s[j] = c;
13, ++i;
13, ++j;
6, }
17, s[j] = '\0';
14, return i;
2, }
1,
34, void copy(char to[], char from[])
2, {
11, int i;
5,
11, i = 0;
38, while ((to[i] = from[i]) != '\0')
13, ++i;
2, }
for (i = 0; (c = getchar()) != EOF && c !='\n'; ++i)
$ ./a.out
1
2, 1
12345
6, 12345
12
3, 12
1234
5, 1234
123
4, 123
12345
6, 12345
67890
6, 67890
12345
$ ./a.out
123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789
1000, 12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678
1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890
1001, 12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678
12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678
$
演習 1-17.
コード
sample.c
#include <stdio.h>
#define MAXLINE 1000
#define MINLENGTH 80
int my_getline(char line[], int maxline);
int main()
{
int len;
char line[MAXLINE];
while ((len = my_getline(line, MAXLINE)) > 0)
if (len > MINLENGTH)
printf("%s", line);
return 0;
}
int my_getline(char s[], int lim)
{
int c, i, j;
j = 0;
for (i = 0; (c = getchar()) != EOF && c !='\n'; ++i)
if (i < lim - 2) {
s[j] = c;
++j;
}
if (c == '\n') {
s[j] = c;
++i;
++j;
}
s[j] = '\0';
return i;
}
入出力結果(Terminal)
$ ./a.out 1234677890 12346778901234677890 123467789012346778901234677890 1234677890123467789012346778901234677890 12346778901234677890123467789012346778901234677890 123467789012346778901234677890123467789012346778901234677890 1234677890123467789012346778901234677890123467789012346778901234677890 12346778901234677890123467789012346778901234677890123467789012346778901234677890 12346778901234677890123467789012346778901234677890123467789012346778901234677890 1234677890123467789012346778901234677890123467789012346778901234677890123467789 123467789012346778901234677890123467789012346778901234677890123467789012346778901 123467789012346778901234677890123467789012346778901234677890123467789012346778901 123467789012346778901234677890123467789012346778901234677890123467789012346778901234677890 123467789012346778901234677890123467789012346778901234677890123467789012346778901234677890 $ cat sample.c|./a.out
演習 1-18.
コード
sample.c
#include <stdio.h>
#define MAXLINE 1000
int my_getline(char line[], int maxline);
int my_remove(char line[]);
int main()
{
char line[MAXLINE];
while (my_getline(line, MAXLINE) > 0)
if (my_remove(line) > 0)
printf("%s", line);
return 0;
}
int my_getline(char s[], int lim)
{
int c, i, j;
j = 0;
for (i = 0; (c = getchar()) != EOF && c !='\n'; ++i)
if (i < lim - 2) {
s[j] = c;
++j;
}
if (c == '\n') {
s[j] = c;
++i;
++j;
}
s[j] = '\0';
return i;
}
int my_remove(char line[])
{
int c, i;
i = 0;
while (line[i] != '\n')
++i;
--i;
while ( i >= 0 && (line[i] == ' ' || line[i] == '\t'))
--i;
if (i >= 0) {
++i;
line[i] = '\n';
++i;
line[i] = '\0';
}
return i;
}
入出力結果(Terminal)
$ cat sample.c | ./a.out
#include <stdio.h>
#define MAXLINE 1000
int my_getline(char line[], int maxline);
int my_remove(char line[]);
int main()
{
char line[MAXLINE];
while (my_getline(line, MAXLINE) > 0)
if (my_remove(line) > 0)
printf("%s", line);
return 0;
}
int my_getline(char s[], int lim)
{
int c, i, j;
j = 0;
for (i = 0; (c = getchar()) != EOF && c !='\n'; ++i)
if (i < lim - 2) {
s[j] = c;
++j;
}
if (c == '\n') {
s[j] = c;
++i;
++j;
}
s[j] = '\0';
return i;
}
int my_remove(char line[])
{
int c, i;
i = 0;
while (line[i] != '\n')
++i;
--i;
while ( i >= 0 && (line[i] == ' ' || line[i] == '\t'))
--i;
if (i >= 0) {
++i;
line[i] = '\n';
++i;
line[i] = '\0';
}
return i;
}
$
演習 1-19.
コード
sample.c
#include <stdio.h>
#define MAXLINE 1000
int my_getline(char line[], int maxline);
void reverse(char line[]);
int main()
{
char line[MAXLINE];
while (my_getline(line, MAXLINE) > 0) {
reverse(line);
printf("%s", line);
}
return 0;
}
int my_getline(char s[], int lim)
{
int c, i, j;
j = 0;
for (i = 0; (c = getchar()) != EOF && c !='\n'; ++i)
if (i < lim - 2) {
s[j] = c;
++j;
}
if (c == '\n') {
s[j] = c;
++i;
++j;
}
s[j] = '\0';
return i;
}
void reverse(char line[])
{
int c, i, j;
char tmp_c;
i = 0;
while (line[i] != '\0')
++i;
--i;
if (line[i] == '\n')
--i;
j = 0;
while (j < i) {
tmp_c = line[j];
line[j] = line[i];
line[i] = tmp_c;
++j;
--i;
}
}
入出力結果(Terminal)
$ cat sample.c | ./a.out
>h.oidts< edulcni#
0001 ENILXAM enifed#
;)enilxam tni ,][enil rahc(enilteg_ym tni
;)][enil rahc(esrever diov
)(niam tni
{
;]ENILXAM[enil rahc
{ )0 > )ENILXAM ,enil(enilteg_ym( elihw
;)enil(esrever
;)enil ,"s%"(ftnirp
}
;0 nruter
}
)mil tni ,][s rahc(enilteg_ym tni
{
;j ,i ,c tni
;0 = j
)i++ ;'n\'=! c && FOE =! ))(rahcteg = c( ;0 = i( rof
{ )2 - mil < i( fi
;c = ]j[s
;j++
}
{ )'n\' == c( fi
;c = ]j[s
;i++
;j++
}
;'0\' = ]j[s
;i nruter
}
)][enil rahc(esrever diov
{
;j ,i ,c tni
;c_pmt rahc
;0 = i
)'0\' =! ]i[enil( elihw
;i++
;i--
)'n\' == ]i[enil( fi
;i--
;0 = j
{ )i < j( elihw
;]j[enil = c_pmt
;]i[enil = ]j[enil
;c_pmt = ]i[enil
;j++
;i--
}
}
$ ./a.out
12345
54321
abcde
edcba
$
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