Square appearing

Hello guys,
when i built the program using Codeblocks and write "aaa" and then hit "Enter" the output was like: "4: aaa" and there was a square standing on its vertex just below "4". How did it hapen?
The code is here:

Code:

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#include <stdio.h>

#define MAXLINE 4 /* maximum input line size */


int getline(char line[], int maxline);
void copy(char to[], char from[]);


/* print longest input line */
int main(void)
{
  int len;              /* current line length */
  int max;              /* maximum length seen so far */
  char line[MAXLINE];    /* current input line */
  char longest[MAXLINE]; /* longest line saved here */


  max = 0;


  while((len = getline(line, MAXLINE)) > 0)
  {
    printf("%d: %s", len, line);


    if(len > max)
    {
      max = len;
      copy(longest, line);
    }
  }
  if(max > 0)
  {
    printf("Longest is %d characters:\n%s", max, longest);
  }
  printf("\n");
  return 0;
}


/* getline: read a line into s, return length */
int getline(char s[], int lim)
{
  int c, i, j;


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


/* copy: copy 'from' into 'to'; assume 'to' is big enough */
void copy(char to[], char from[])
{
  int i;


  i = 0;
  while((to[i] = from[i]) != '\0')
  {
    ++i;
  }
}

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Quote:

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Originally Posted by shotakobakhidze

when i built the program using Codeblocks and write "aaa" and then hit "Enter" the output was like: "4: aaa" and there was a square standing on its vertex just below "4". How did it hapen?

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Are you sure that is not just the cursor for you to enter the next line of input?

By the way, why do you have both i and j in the implementation of getline? It seems to me that it would be simpler to use just one of them. Also, note that getline is the name of a POSIX function, so it may be safer to use a different name or add a prefix, e.g., shota_getline.

if the amount of written characters isn't 3(without hitting enter), then nothing appears after hitting "Enter" and the cursor stands below "the number of characters", but if the amount is 3(in the example above), then the square appears and the cursor next to it.

Because you have MAXLINE defined as 4.

I think you have to return j not i.

You also need to assign max to a value other than zero.

And what happens if the user enters EOF?

Jim