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C/C++ code:

#include <stdio.h>

#define MAXLINE 20

int getline(char s[], int lim);
void copy(char to[], char from[]);

int main(void)
{
char line[MAXLINE];
char longest[MAXLINE];
char temp[MAXLINE];
int len, max, prevmax, getmore;

max = prevmax = getmore = 0;
[color=#FF0000]while((len = getline(line, MAXLINE)) > 0)[/color]
{
if(line[len - 1] != '\n')
{
if(getmore == 0)
copy(temp, line);
prevmax += len;
if(max < prevmax)
max = prevmax;
getmore = 1;
}
else
{
if(getmore == 1)
{
if(max < prevmax + len)
{
max = prevmax + len;
copy(longest, temp);
longest[MAXLINE - 2] = '\n';
}
getmore = 0;
}

else if(max < len)
{
max = len;
copy(longest, line);
}
prevmax = 0;
}