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#include <stdio.h>
 
#define MAXLINE 1000;
 
int max;
char line[MAXLINE];
char longest[MAXLINE];
 
 
int geline(void);
void copy(void);
 
int main() {
    int len;
    extern int max;
    extern char longest[];
    max = 0;
 
    while ((len = getline()) >= 0) 
    if (len > max) {
        max = len;
        copy();
    }
    if (max > 0) 
        printf("%s", longest);
    return 0;
}
 
 
int getline (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;
}

prog.c:3:21: error: expected ‘]’ before ‘;’ token
 #define MAXLINE 1000;
                     ^
prog.c:6:11: note: in expansion of macro ‘MAXLINE’
 char line[MAXLINE];
           ^~~~~~~
prog.c:3:21: error: expected ‘]’ before ‘;’ token
 #define MAXLINE 1000;
                     ^
prog.c:7:14: note: in expansion of macro ‘MAXLINE’
 char longest[MAXLINE];
              ^~~~~~~
prog.c: In function ‘main’:
prog.c:19:19: warning: implicit declaration of function ‘getline’ [-Wimplicit-function-declaration]
     while ((len = getline()) >= 0)
                   ^~~~~~~
prog.c: In function ‘getline’:
prog.c:33:31: warning: value computed is not used [-Wunused-value]
     for (i = 0; i < MAXLINE-1 && (c = getchar()) !+ EOF && c != '\n'; ++i)
                            ~~~^~~~~~~~~~~~~~~~~~
prog.c:33:50: error: expected ‘)’ before ‘!’ token
     for (i = 0; i < MAXLINE-1 && (c = getchar()) !+ EOF && c != '\n'; ++i)
                                                  ^

Standard output is empty