diff options
| -rw-r--r-- | 1-22_wordwrap.c | 30 | ||||
| -rw-r--r-- | 1-23_decomment.c | 84 |
2 files changed, 99 insertions, 15 deletions
diff --git a/1-22_wordwrap.c b/1-22_wordwrap.c index 5e17b50..83acfd6 100644 --- a/1-22_wordwrap.c +++ b/1-22_wordwrap.c @@ -53,22 +53,22 @@ int b_find_blank(char s[], int lim) { int main() { while (j = get_line(data, MAXLEN)) { - if (j == 80) { - // We know it's a long line now. Let's make sure we're breaking in - // the right place - k = b_find_blank(data, MAXLEN); - //printf("%d\n", k); - if (k > -1) { - data[k] = '\n'; - data[MAXLEN] = '\0'; - printf("%s", data); - continue; - } else { - data[MAXLEN] = '\0'; - printf("%s\n", data); - continue; - } + if (j == 80) { + // We know it's a long line now. Let's make sure we're breaking in + // the right place + k = b_find_blank(data, MAXLEN); + //printf("%d\n", k); + if (k > -1) { + data[k] = '\n'; + data[MAXLEN] = '\0'; + printf("%s", data); + continue; + } else { + data[MAXLEN] = '\0'; + printf("%s\n", data); + continue; } + } printf("%s", data); } diff --git a/1-23_decomment.c b/1-23_decomment.c new file mode 100644 index 0000000..63193cd --- /dev/null +++ b/1-23_decomment.c @@ -0,0 +1,84 @@ +#include <stdio.h> + +/* The C Programming Language: 2nd Edition + * Exercise 1-23: + * "Write a program to remove all comments from a C program. Don't forget to + * handle quoted strings and character constants properly. C comments do not + * nest." + * + * I'm not sure why the instructions tell the reader to account for quoted + * strings and character constants. Comments always begin with either // or + * /*, so that sets the boundary of state. + * + * The states for this program are IN_MULTI for a multi-line comment, + * IN_SINGLE for a single line comment, and OUT for being outside a comment. + * These three states are all I need to determine whether I should output the + * contents of the C file or not. Characters are only output when the state is + * OUT, and there are conditions for getting into and out of comment state. + * + * I don't know of any other way to do this without invoking some higher-level + * libraries. + */ + +#define IN_MULTI 1 +#define IN_SINGLE 2 +#define OUT 0 + +char c, p; +int status; + +int main() { + // Treat input like a stream, since that's all the K&R has explained so far. + while ((c = getchar()) != EOF) { + + // Check for the ways to open a comment, and set state accordingly + if (c == '/' && status == OUT) { + // Look ahead and store the character that's returned + p = getchar(); + + if (p == '*') { + status = IN_MULTI; + } else if (p == '/') { + status = IN_SINGLE; + } else { + putchar(c); + putchar(p); + continue; + } + } + + // Ignore everything in a single line comment until a newline + if (status == IN_SINGLE) { + + if (c == '\n') { + putchar(c); + status = OUT; + continue; + } + + } + + // Ignore everything until you reach the end of a multi comment + if (status == IN_MULTI && c == '*') { + p = getchar(); + + if (p == '/') { + status = OUT; + continue; + } + + } + + // Output everything when we're not in a comment! + if (status == OUT) { + putchar(c); + } + + } + + /* derpsauce + * + * + * Testing comment for the lulz. lolololol + */ +} |