// This version of printLongestLine prints the longest input line, but is specialized to use external variables. These are external to all functions, and can be accessed by name by any function.

#include <stdio.h>

#define MAXLINE 1000 //maximum input line size

int max;  // maximum input line size
char line[MAXLINE]; // current input line
char longest[MAXLINE]; // longest line saved here

int mygetline(void);
void copy(void);

// print longest input line;, specialized version

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

  max = 0;
  while ((len = mygetline()) > 0) {
    if (len > max) {
      max = len;
      copy();
    }

  }
  if (max > 0)
    printf("%s", longest);
  return 0;
}

// mygetline: specialized version

int mygetline(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;
}

// copy: specialized version

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

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