Recently I came across an example from the book “The C Programming Language” and decided to run it:
<code>#include <stdio.h>
#define IN 1
#define OUT 0
int main() {
int c, nl, nw, nc, state;
state = OUT;
nl = nw = nc = 0;
while ((c = getchar()) != EOF) {
++nc;
if (c == 'n')
++nl;
if (c == ' ' || c == 'n' || c == 't')
state = OUT;
else if (state == OUT) {
state = IN;
++nw;
}
}
printf("%d %d %dn", nl, nw, nc);
}
</code>
<code>#include <stdio.h>
#define IN 1
#define OUT 0
int main() {
int c, nl, nw, nc, state;
state = OUT;
nl = nw = nc = 0;
while ((c = getchar()) != EOF) {
++nc;
if (c == 'n')
++nl;
if (c == ' ' || c == 'n' || c == 't')
state = OUT;
else if (state == OUT) {
state = IN;
++nw;
}
}
printf("%d %d %dn", nl, nw, nc);
}
</code>
#include <stdio.h>
#define IN 1
#define OUT 0
int main() {
int c, nl, nw, nc, state;
state = OUT;
nl = nw = nc = 0;
while ((c = getchar()) != EOF) {
++nc;
if (c == 'n')
++nl;
if (c == ' ' || c == 'n' || c == 't')
state = OUT;
else if (state == OUT) {
state = IN;
++nw;
}
}
printf("%d %d %dn", nl, nw, nc);
}
There is a problem related to printf(). For some reason, only the first character is printed, although there should be 3 of them. What could be the problem?
System – Windows. For editing code I use Visual Studio Code. Compiler – gcc.
Interesting fact: on macOS this problem do not occur and the output is as needed.
Input:
<code>a
ab
abc
abcd
</code>
<code>a
ab
abc
abcd
</code>
a
ab
abc
abcd
Output:
<code>4
</code>
<code>4
</code>
4
Desired output:
<code>4 4 14
</code>
<code>4 4 14
</code>
4 4 14
Thanks in advance!
ANSWER:
I used control-C thinking that it was suitable as an EOF-indicator. The correct option is to use control-Z.
11
The idea here is:
- to count letters, words and lines from the input file. Words are separated by spaces or tabs or newlines.
- the program implements a minimalist FSM, a finite state machine with 2 states.
I am not sure I understand the question, but here is the output for this file
<code>one another
one
another
</code>
<code>one another
one
another
</code>
one another
one
another
<code>3 4 24
</code>
<code>3 4 24
</code>
3 4 24
And it seems ok. Note that is you are testing this interactively control-Z is the EOF indicator.