longest-line.c

#include <stdio.h>
#define MAXLINE 1000

int max;
char line[MAXLINE];
char longest[MAXLINE];

int getlin(void);
void copy();

main()
{
	int len;
	extern int max;
	extern char longest[];

	max=0;
	while((len = getlin())>0)
		if (len>max){
			max=len;
			copy();
		}
	if(max>0)
		printf("%s", longest);
	return 0;
}

int getlin(void)
{
	int c, i;
	extern char line[];

	for (i=0; i<MAXLINE-1 && (c=getchar()) != EOF && c !='\n'; ++i)
		line[i]=c;
	if(c=='\n'){
		line[i]=c;
		++i;
	}
	line[i]='\0';
	return i;
}

void copy(void)
{
	int i;
	extern char line[], longest[];

	i=0;
	while((longest[i]=line[i])!='\0')
		++i;
}