introducing printf causes wrong behaviour of a previously working program
Here is the base code (the program displays the longest line inputted by user):
Code:
#include <stdio.h>
#define MAXLINE 100
int getlne(char line[], int maxline);
void copy(char to[], char from[]);
int main()
{
int len;
int max;
char line[MAXLINE];
char longest[MAXLINE];
max = 0;
while ((len = getlne(line, MAXLINE)) > 0)
if (len > max) {
max = len;
copy(longest, line);
}
if (max > 0)
printf("the longest is %s", longest);
return 0;
}
int getlne(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;
}
void copy(char to[], char from[])
{
int i;
i = 0;
while ((to[i] = from[i]) != '\0')
++i;
}
However, when I try to add such a printf
Code:
printf("length %d", len);
here
Code:
max = 0;
while ((len = getlne(line, MAXLINE)) > 0)
printf("length %d", len);
if (len > max) {
max = len;
The printf showing longest string stops working.
What am I doing wrong?