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#include <stdio.h>
#include <memory.h>
 
#define MAXLINE 1000
 
int getline(char line[], int maxline);
void copy(char to[], char from[]);
 
int main(void){
	int c;
    int len;	/*Äëèíà òåêóùåé ñòðîêè*/
    int max;	/*Òåêóùàÿ ìàêñèìàëüàíÿ äëèíà*/
    char line[MAXLINE];		/*Òåêóùàÿ ââåäåííàÿ ñòðîêà*/
    char longest[MAXLINE];	/*Ñàìàÿ äëèííàÿ ñòðîêà*/
 
    max = 0;
    while((len = getline(line, MAXLINE)) > 0)
    	if(len > max){
    		max = len;
    		copy(line, longest);
    	}
	if(max > 0)	printf("%s", 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] = '\n';
		i++;
	}
	s[i] = '\0';
	return i;
}
 
void copy(char from[], char to[]){
	int i;
 
	i = 0;
	while((to[i] = from[i]) != '\0')
		i++;
}

prog.c:6:5: error: conflicting types for 'getline'
 int getline(char line[], int maxline);
     ^
In file included from prog.c:1:0:
/usr/include/stdio.h:678:20: note: previous declaration of 'getline' was here
 extern _IO_ssize_t getline (char **__restrict __lineptr,
                    ^
prog.c: In function 'main':
prog.c:10:6: warning: unused variable 'c' [-Wunused-variable]
  int c;
      ^
prog.c: At top level:
prog.c:27:5: error: conflicting types for 'getline'
 int getline(char s[], int lim){
     ^
In file included from prog.c:1:0:
/usr/include/stdio.h:678:20: note: previous declaration of 'getline' was here
 extern _IO_ssize_t getline (char **__restrict __lineptr,
                    ^

Standard output is empty