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  1. #include <stdlib.h>
  2. #include <stdio.h>
  3. #include <string.h>
  4. #include <ctype.h>
  5.  
  6. void removeWords(char * buf)
  7. {
  8.     char * s = buf;
  9.     while(ispunct(*s) || isblank(*s)) ++s;
  10.     while(isalnum(*s)) ++s;
  11.     while(ispunct(*s) || isblank(*s)) ++s;
  12.     memmove(buf,s,strlen(s)+1);
  13.  
  14.     s = buf + strlen(buf) - 1;
  15.     while(ispunct(*s) || isblank(*s) || *s=='\n') --s;
  16.     while(isalnum(*s)) --s;
  17.     *s++ = '\n';
  18.     *s = 0;
  19. }
  20.  
  21. int main()
  22. {
  23.     #define  MAXLEN 512
  24.     char buf[MAXLEN];
  25.     for(int no = 1; fgets(buf,MAXLEN,stdin); ++no)
  26.     {
  27.         if (no%2==0) removeWords(buf);
  28.         printf("%3d: %s",no,buf);
  29.     }
  30. }
  31.  
Success #stdin #stdout 0s 4712KB
comments (?)
stdin 
first string hello
second string world!
third string Bye-bye,
fourth string cruel world...
stdout 
  1: first string hello
  2: string
  3: third string Bye-bye,
  4: string cruel
https://ideone.com/gqYLU4
language:
C (gcc 8.3)
created:
5 years ago
visibility:
public

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