diff options
Diffstat (limited to '')
| -rw-r--r-- | ch1/1-16_longest-line.c | 92 | ||||
| -rw-r--r-- | ch5/5-01_getint-fixed.c | 7 |
2 files changed, 51 insertions, 48 deletions
diff --git a/ch1/1-16_longest-line.c b/ch1/1-16_longest-line.c index 450d990..3c86570 100644 --- a/ch1/1-16_longest-line.c +++ b/ch1/1-16_longest-line.c @@ -10,70 +10,66 @@ * to tackle a problem in chunks of memory instead of all at once. It's * slightly more complicated, but adds usefulness to a program. * - * This solution, which was contributed by Isa (ibnIrshad), follows the spec - * exactly, by only modifying main(), unlike many other solutions on the - * internet. + * This solution follows the spec exactly, by only modifying main(), unlike many + * other solutions on the internet. * * Assumptions: * 1. "arbitrarily long" is interpreted to mean upto the maximum size of an * integer on the given architechture, e.g. 2^32 unsigned on a 32-bit machine. - * Indeed a string of that size would be larger than 4 gigabytes. - * It is possible to deal with numbers larger than that, but it involves a great - * deal of work abstracting away the concept of an integer, similar to - * dynamically sized arrays. + * Indeed a string of that size would be larger than 4 gigabytes. It is possible + * to deal with numbers larger than that, but it involves a great deal of work + * abstracting away the concept of an integer, similar to dynamically sized + * arrays. * * 2. EOF signal (Ctrl-D) must be given on an empty line */ -#define BUFFSIZE 5 /* renamed MAXLINE and reduced it to 5 to demonstrate -we can handle lines much greater than this number*/ + +/* demonstrate that we can handle lines much greater than this number*/ +#define BUFFSIZE 5 int getlinelen(char line[], int maxline); void copy(char to[], char from[]); /* print longest input line */ -main() -{ - /* len of current line, max len seen so far, templen of buffer */ - int len, max, templen; - char buffer[BUFFSIZE]; - - max = len = 0; - - while ((templen = getlinelen(buffer, BUFFSIZE)) > 0) { - len += templen; - - if (buffer[templen-1] == '\n'){ - if (len > max) - max = len; - len = 0; - } - } - printf("\nLen of longest line: %d\n", max); - return 0; +main() { + /* len of current line, max len seen so far, templen of buffer */ + int len, max, templen; + char buffer[BUFFSIZE]; + max = len = 0; + while ((templen = getlinelen(buffer, BUFFSIZE)) > 0) { + len += templen; + if (buffer[templen - 1] == '\n') { + if (len > max) { + max = len; + } + len = 0; + } + } + /* The length returned includes the '\n' character. */ + printf("\nLen of longest line: %d\n", max); + return 0; } /* getlinelen: read a line into s, return length */ -int getlinelen(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') { - s[i] = c; - ++i; - } - s[i] = '\0'; - return i; +int getlinelen(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') { + s[i] = c; + ++i; + } + s[i] = '\0'; + return i; } -/* copy: copy 'from into 'to'; assume to is big enough */ -void copy(char to[], char from[]) -{ - int i; - - i = 0; - while ((to[i] = from[i]) != '\0') - ++i; +/* copy: copy 'from' into 'to'; assume 'to' is big enough */ +void copy(char to[], char from[]) { + int i; + i = 0; + while ((to[i] = from[i]) != '\0') { + ++i; + } } diff --git a/ch5/5-01_getint-fixed.c b/ch5/5-01_getint-fixed.c index 8d53ba6..b013f20 100644 --- a/ch5/5-01_getint-fixed.c +++ b/ch5/5-01_getint-fixed.c @@ -23,6 +23,7 @@ int main() { while (getint(bar) > 0) { printf("%d\n", foo); } + printf("Contents of buffer:%s\n", buf); return 0; } @@ -38,8 +39,14 @@ int getint(int *pn) { sign = (c == '-') ? -1 : 1; if (c == '+' || c == '-') { c = getch(); + if (!isdigit(c)) { + ungetch(c); + ungetch(sign == 1 ? '+' : '-'); + return 0; + } } if (!isdigit(c)) { + ungetch(c); return 0; } for (*pn = 0; isdigit(c); c = getch()) { |