前言

來源之《c程式語言》練習1-16

程式碼

#include<stdio.h>
#define MAXLINE 1000

int getline(char line[], int maxline);
void copy(char to[], char from[]);


int main()
{
    int len, max;
    char line[MAXLINE];
    char longest[MAXLINE];

    max = 0;
    while ((len = 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;
}


/*getline: read a line into s, return length*/
int 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;
        ++j;
        ++i;
    }
    s[j] = '\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;
    }
}