C programming Kernighan/ritchie example doesnt work properly

Hey guys,

Ive been working through this book to learn C and when i compile one of the examples, the command window comes up, and i can type in it, but when i press enter, nothing happens, it just makes a new line, and the printf command in main() doesnt ever seem to execute. Please could anyone shine a light on why it may not be running properly? Any help would be greatly appreciated.

Thanks

Code:

// Read Line.cpp : Defines the entry point for the console application.
//

#include <stdio.h>
#define MAXLINE 1000 /* maximum input line size */

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

/*print longest input line */

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

	max = 0;
	while ((len = getline(line, MAXLINE)) > 0)
		if (len > max) {
			max = len;
			copy(longest, line);
		}

		if (max > 0) /* there was a line */
			printf("%s", longest);
		return 0;
}



/* getline: read a line into s, return length */
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] = c;
		++i;
	}
	s[i] = '\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;
}

Code:

!= EOF

The way the loops are set up, the longest line will not get printed out until the program sees EOF.

Under Windows, you can do EOF with a ctrl-z key combo, and under Unix like systems, it is ctrl-d. Enter your text, and then do EOF, and you will see it works.

thanks a lot for the reply, it works now, you've saved me a few headaches!