#include <stdio.h>

#define MAXLINE 1000

int getline(char line[],int maxline);

void copy(char to[],char from[]);

int main()

{

    int len;

    int max;

    char line[MAXLINE];

    char longest[MAXLINE];

    max = 0;

    while((len = getline(line,MAXLINE)) > 0)

        if(len > max)

        {

            max = len;

            copy(longest,line);

        }

    if(max > 0)

        printf("%s\n",longest);

    return 0;

}

int getline(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;

}

void copy(char to[],char from[])

{

    int i = 0;

    while((to[i] = from[i]) != '\0')

        i++;

}

gg了，不知道为什么ubuntu总是出现变量冲突的错误。VC++6.0 运行没问题。值得思考！！