diff options
Diffstat (limited to 'one')
| -rw-r--r-- | one/char.c | 53 | ||||
| -rw-r--r-- | one/count.c | 41 | ||||
| -rw-r--r-- | one/longest.c | 86 | ||||
| -rw-r--r-- | one/power.c | 21 | ||||
| -rw-r--r-- | one/tab.c | 59 | ||||
| -rw-r--r-- | one/temp.c | 31 | ||||
| -rw-r--r-- | one/uncom.c | 34 |
7 files changed, 325 insertions, 0 deletions
diff --git a/one/char.c b/one/char.c new file mode 100644 index 0000000..91cfc75 --- /dev/null +++ b/one/char.c @@ -0,0 +1,53 @@ +#include <stdio.h> + +#define IN 1 /* inside of a word */ +#define OUT 0 /* outside of a word */ + +/* count lines, words, and characters */ +void +wc() +{ + /* + * c must be big enough to hold any value getchar() returns so we use + * int instead of char to hold EOF, an integer defined in stdio + */ + int c, nl, nw, nc, state; + state = OUT; + nl = nw = nc = 0; + while ((c = getchar()) != EOF) { + ++nc; + if (c == '\n') { + ++nl; + } + /* && is higher precedence than || */ + if (c == ' ' || c == '\t' || c == '\n') { + state = OUT; + } else if (state == OUT) { + state = IN; + ++nw; + } + } + printf("%d %d %d\n", nl, nw, nc); +} + +/* print input separated by new lines */ +void +print_word_line() +{ + int c; + while ((c = getchar()) != EOF) { + if (c == ' ' || c == '\t' || c == '\n') { + putchar('\n'); + } else { + putchar(c); + } + } +} + +int +main() +{ + wc(); + /* print_word_line(); */ + return 0; +} diff --git a/one/count.c b/one/count.c new file mode 100644 index 0000000..0f5bb82 --- /dev/null +++ b/one/count.c @@ -0,0 +1,41 @@ +#include <stdio.h> + +/* count digits, white space, and others */ +int +main() +{ + int c, i, nwhite, nother; + int ndigit[10]; + int nchar[26]; + nwhite = nother = 0; + + for (i = 0; i < 26; ++i) { + if (i < 10) { + ndigit[i] = 0; + } + nchar[i] = 0; + } + + while ((c = getchar()) != EOF) { + if (c >= '0' && c <= '9') { + ++ndigit[c - '0']; + } else if (c == ' ' || c == '\t' || c == '\n') { + ++nwhite; + } else if (c >= 'a' && c <= 'z') { + ++nchar[c - 'a']; + } else { + ++nother; + } + } + + printf("digits ="); + for (i = 0; i < 10; ++i) { + printf(" %d", ndigit[i]); + } + printf("\nchars ="); + for (i = 0; i < 26; ++i) { + printf(" %d", nchar[i]); + } + printf("\nwhite space = %d\nother = %d\n", nwhite, nother); + return 0; +} diff --git a/one/longest.c b/one/longest.c new file mode 100644 index 0000000..cf19ac9 --- /dev/null +++ b/one/longest.c @@ -0,0 +1,86 @@ +#include <stdio.h> + +#define MAXLINE 1024 + +/* + * read a line into s, return length, + * assume length is less than MAXLINE + * and the line number is less than MAXLINE + */ +int +get_line(char s[], int lim) +{ + int c, i; + for (i = 0; i < lim - 1 && (c = getchar()) != EOF && c != '\n'; ++i) { + s[i] = c; + } + if (c == '\n') { + /* increment i after assignment */ + s[i++] = c; + } + /* put null character at end of string */ + s[i] = '\0'; + return i; +} + +/* copy from into to */ +void +copy(char to[], char from[]) +{ + int i = 0; + /* '\0' marks end of string */ + while ((to[i] = from[i]) != '\0') { + ++i; + } +} + +/* remove trailing whitespace */ +void +trim(char s[], int i) +{ + /* skip null character and new line */ + i -= 2; + while (i >= 0 && (s[i] == ' ' || s[i] == '\t')) { + --i; + } + s[i] = '\0'; +} + +/* flip characters in string */ +void +reverse(char s[]) +{ + int i = 0; + while (s[i] != '\n') { + ++i; + } + --i; + char c; + for (int j = 0; j < i / 2; ++j) { + c = s[i - j]; + s[i - j] = s[j]; + s[j] = c; + } +} + +/* print longest input line */ +int +main() +{ + char line[MAXLINE], longest[MAXLINE]; + + int len; + int max = 0; + while ((len = get_line(line, MAXLINE)) > 0) { + if (len > max) { + max = len; + copy(longest, line); + } + } + if (max > 0) { + /* trim(longest, max); */ + /* reverse(longest); */ + printf("%s", longest); + } + return 0; +} diff --git a/one/power.c b/one/power.c new file mode 100644 index 0000000..dd2ba2d --- /dev/null +++ b/one/power.c @@ -0,0 +1,21 @@ +#include <stdio.h> + +int +power(int m, int n) +{ + int p; + for (p = 1; n > 0; --n) { + p *= m; + } + return p; +} + +int +main() +{ + int i; + for (i = 0; i < 10; ++i) { + printf("%d %d %d\n", i, power(2, i), power(-3, i)); + } + return 0; +} diff --git a/one/tab.c b/one/tab.c new file mode 100644 index 0000000..f9c6dc5 --- /dev/null +++ b/one/tab.c @@ -0,0 +1,59 @@ +#include <stdio.h> + +/* XXX: dependent on file size */ +#define MAX 1024 + +void detab() +{ + char detab[MAX]; + + int c, i; + i = 0; + while (i < MAX && (c = getchar()) != EOF) { + if (c == '\t') { + for (int t = 0; t < 8; ++t) { + detab[i + t] = ' '; + } + i += 8; + } else { + detab[i++] = c; + } + } + detab[i] = '\0'; + printf("%s", detab); +} + +void entab() +{ + char entab[MAX]; + + int c, i, s; + i = s = 0; + while (i < MAX && (c = getchar()) != EOF) { + if (c == ' ') { + ++s; + } else { + while (s > 0) { + if (s >= 8) { + entab[i++] = '\t'; + s -= 8; + } else { + entab[i++] = ' '; + --s; + } + } + entab[i++] = c; + } + } + + entab[i] = '\0'; + printf("%s", entab); +} + +int +main() +{ + detab(); + /* entab(); */ + return 0; +} diff --git a/one/temp.c b/one/temp.c new file mode 100644 index 0000000..54c99ba --- /dev/null +++ b/one/temp.c @@ -0,0 +1,31 @@ +#include <stdio.h> + +#define LOWER 0 +#define UPPER 300 +#define STEP 20 + +void +temp() +{ + float fahr, cel; + + printf("Fahrenheit-Celsius table\n"); + for (fahr = UPPER; fahr >= LOWER; fahr -= STEP) { + cel = (5.0 / 9.0) * (fahr - 32.0); + /* 3 and 6 characters wide with 1 digit after the dot */ + printf("%3.0f %6.1f\n", fahr, cel); + } + + printf("\nCelsius-Fahrenheit table\n"); + for (cel = LOWER; cel <= UPPER; cel += STEP) { + fahr = 9.0 / 5.0 * cel + 32.0; + printf("%3.0f %6.0f\n", cel, fahr); + } +} + +int +main() +{ + temp(); + return 0; +} diff --git a/one/uncom.c b/one/uncom.c new file mode 100644 index 0000000..455f138 --- /dev/null +++ b/one/uncom.c @@ -0,0 +1,34 @@ +#include <stdio.h> + +/* XXX: dependent on file size */ +#define MAX 2048 + +int +main() +{ + char uncomment[MAX]; + int c, i; + i = 0; + while (i < MAX && (c = getchar()) != EOF) { + if (c == '/') { + c = getchar(); + if (c == '*') { + while ((c = getchar()) != '/') { + if (c == '\n') { + putchar('\n'); + } else { + putchar(' '); + } + } + } else if (c == '/') { + while ((c = getchar()) != '\n') { + putchar(' '); + } + putchar('\n'); + } + } else { + putchar(c); + } + } + return 0; +} |