1-18 练习

#include <stdio.h>

#define MAXLEN 10
#define SP ' '
#define TAB '\t'

int max = 0;
char line[MAXLEN];
char longest[MAXLEN];

int getline(char *, int);
void copy(char *, char *);
void removeChar(char *, int maxlen);

int main(int argc, char **argv) {
    int len = 0;
    int max = 0;
    while ((len = getline(line, MAXLEN)) > 0) {
        removeChar(line, MAXLEN);
        if (len > max) {
            copy(line, longest);
            max = len;
        }
    }

    if(max > 0 ) {
        printf("longest line: %s\n", longest);
    }

    return 0;
}

int getline(char *des, int limit) {
    char c;
    int i = 0;
    while ((c = getchar()) != EOF && c != '\n' && --limit >= 0) {
        des[i++] = c;
    }
    if (c == '\n') {
        des[i++] = c;
    }
    des[i] = '\0';

    return i;
}

void copy(char *src, char *des) {
    int i = 0;
    while ((des[i] = src[i]) != '\0') {
        ++i;
    }

    return;
}

void removeChar(char *line, int maxLen) {
    int i = maxLen - 1;
    while (line[i] == SP || line[i] == TAB) {
        --i;
    }
    line[++i] = '\0';
    return;
}