C, problem with news and tabs next to each other

Question

Here is my original code:

#include <stdio.h>

#define IN  1   // inside a word
#define OUT 0   // outside a word

// program to print input one word per line

int main(void)
{
  int c, state;

  state = OUT;
  while ((c = getchar()) != EOF) {
    if (c == ' ' || c == '\n' || c == '\t') {
      state = OUT;
      printf("\n");
    }
    else if (state == OUT) {
      state = IN;
    }
    if (state == IN) {
      putchar(c);
    }
  }
  return 0;
}

But the problem was that there were two spaces (spaces) or several tabs for which a new line was printed. So I used the variable (last) to track where I was:

#include <stdio.h>

#define IN  1   // inside a word
#define OUT 0   // outside a word

// program to print input one word per line, corrected bug if there was
// more than one space between words to only print one \n

int main(void)
{
  int c, last, state;

  last = EOF;
  state = OUT;
  while ((c = getchar()) != EOF) {
    if (c == ' ' || c == '\n' || c == '\t') {
      if (last != c) {
        state = OUT;
        printf("\n");
      }
    }
    else if (state == OUT) {
      state = IN;
    }
    if (state == IN) {
      putchar(c);
    }
    last = c;
  }
  return 0;
}

This resolved this, except that now that there is a [blank] [tab] between the pages, a new line is printed for both.

Can anyone help?

Answer 1

Your problem with the source code is that you will output your new line for each space character. You want to do this only when moving from word to non-word:

Edit:

if (c == ' ' || c == '\n' || c == '\t') {
    state = OUT;
    printf("\n");
}

at

if (c == ' ' || c == '\n' || c == '\t') {
    if (state == IN) printf("\n");
    state = OUT;
}

---

, , :

enum eState {IN, OUT};
:
enum eState state = OUT;

:

#include <stdio.h>

#define FALSE (1==0)
#define TRUE  (1==1)
// Or: enum eBoolean {FALSE = 0, TRUE = 1};

int main (void) {
    int ch;
    int inWord = FALSE;     // Or: enum eBoolean inWord = FALSE;

    // Process every character.
    while ((ch = getchar()) != EOF) {
        // Check for whitespace.
        if (ch == ' ' || ch == '\n' || ch == '\t') {
            // Check if transitioning nonwhite to white.
            if (inWord) {
                printf("\n");
            }

            // Mark white no matter what.
            inWord = FALSE;
        } else {
            // Mark non whitespace.
            inWord = TRUE;
        }

        // If not whitespace, output character.
        if (inWord) {
            putchar(ch);
        }
    }
    return 0;
}

Answer 2

paxdiablo, (FSA). OUT IN .

. , , FSA. . , , - . , . .

, . , , .

#include <stdio.h>

#define IN  1   // inside a word
#define OUT 0   // outside a word

// program to print input one word per line

int main(void)
{
  int c, state;

  state = OUT;
  while ((c = getchar()) != EOF) {
    switch (state){
    case OUT:
        switch (c){
        case ' ': case '\n': case '\t':
        break;
        default:
            putchar(c);
            state = IN;
        }
    break;
    case IN:
        switch (c){
        case ' ': case '\n': case '\t':
            putchar('\n');
            state = OUT;
        break;
        default:
            putchar(c);
        }
    break;
    }        
  }
  return 0;
}

Answer 3

,

if (last != c) {

. last , . . X.

, , , last , X. , last!=current. , . . , .

 if (last != ' ' && last != '\n' && last != '\t' ) {

:

#include <stdio.h>

#define IN  1                   // inside a word
#define OUT 0                   // outside a word

// program to print input one word per line, corrected bug if there was
// more than one space between words to only print one \n

int main(void)
{
    int c, last, state;

    last = 0;  // We need it to make sure that a newline is not printed in case first
               // char is space, tab or new line.
    state = OUT;
    while ((c = getchar()) != EOF) {
        if (c == ' ' || c == '\n' || c == '\t') {
            // if (last != c)
            if (last != ' ' && last != '\n' && last != '\t' && last != 0 )
            {
                state = OUT;
                printf("\n");
            }
        } else if (state == OUT) {
            state = IN;
        }
        if (state == IN) {
            putchar(c);
        }
        last = c;
    }
    return 0;
}

Edit
​​, paxdiablo.

Answer 4

#include<stdio.h>

#define OFF 0
#define ON 1
main()
{
  int c,state=ON;
  while((c=getchar())!=EOF)
    {
      if(c=='\n'||c==' '||c=='\t')
       {
         if(state==OFF)putchar('\n');
         state=ON;
       }
      else if(state==ON)
       {
         putchar(c);
         state=OFF;
       }
      else if(state==OFF)
       {
         putchar(c);
       }
    }
}

, :

Where, STE=Space, tab or enter.

<STE><WORD>---->TYPE<WORD>
<STE><STE>----->DO NOTHING
<WORD><SPACE>-->TYPE<WORD><ENTER/NEWLINE>
<WORD><WORD>--->TYPE<WORD>

You can replace and enable and disable as shown above.