December 22nd, 2002, 06:13 PM
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Join Date: Dec 2002
Posts: 296
Time spent in forums: < 1 sec
Reputation Power: 6
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stuck on one of the k&r exercises
i'm currently learning c by following 'the c programming language' by kernighan and ritchie.
i'm stuck on one of the exercises that says 'write a program to remove trailing blanks and tabs from each line of input, and to delete entirely blank lines'
my effort follows but it isn't working. i've also added a bit to remove trailing e's, just so i can see if it works or not because i can't tell if it's deleting spaces.
if this is inputted:
afsdf asdfaseee
it outputs this:
afsdf asdfas
ee
so the added '\n' and i assume the added '\0' is in fact being being added and in the right place, but it doesn't seem to have the desired effect - in particular the '\0' which was supposed to resemble the end of the line.
what am i doing wrong?
Code:
#include <stdio.h>
#define MAXLINE 1000 /* maximum input line size */
int getline(char line[], int maxline);
void tidy(char line[], int length);
/* print longest input line*/
main()
{
int len; /* current line length */
int max; /* maximum length seen so far */
char line[MAXLINE]; /* current input line */
max=0;
while((len=getline(line, MAXLINE))>0) {
tidy(line, len);
printf("%s", line);
}
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;
}
void tidy(char line[], int len)
{
int i;
i=len-1;
while (line[i]==' ' || line[i]=='\t' || line[i]=='e' || line[i]=='\n')
--i;
if (i!=-1)
line[++i]='\n';
line[++i]=='\0';
}
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