C language: write a program that copies input to output, and replace multiple spaces with one space.

C language programming Second Edition

1. Write a program that copies the input to the output, and replace multiple spaces with one space?

View the Code directly:

For reference only. The code is from the Internet !!!

Code 1:

 1 #include "stdio.h"
 2 
 3 main()
 4 {
 5     int c;
 6     int i;
 7     int n = 0;
 8 
 9     while ( (c = getchar()) != EOF)
10     {
11         if ( c != '' )
12         {
13             putchar(c);
14         }
15         else if ( n != '')
16         {
17             putchar(c);
18         }
19 
20         n = c;
21     }
22 }

Code 2 (detailed ):

 1 #include <stdio.h>
 2 
 3 /* count lines in input */
 4 int
 5 main()
 6 {
 7         int c, pc; /* c = character, pc = previous character */
 8 
 9         /* set pc to a value that wouldn't match any character, in case
10         this program is ever modified to get rid of multiples of other
11         characters */
12 
13         pc = EOF;
14 
15         while ((c = getchar()) != EOF) {
16                 if (c == '')
17                         if (pc != '')   /* or if (pc != c) */ 
18                                 putchar(c);
19 
20                 /* We haven't met 'else' yet, so we have to be a little clumsy */
21                 if (c != '')
22                         putchar(c);
23                 pc = c;
24         }
25 
26         return 0;
27 }

PS: My eyes burst into tears ~~ O (>_<) o ~~