Thread: Changing this to user prompt help.

All I need help with is to change the last part to a user prompt instead of just already having the value entered within the program. The part I need to change is bold. This program is supposed to reverse the word order. i.e apples and oranges = oranges and apples.

Can someone write it please?

I was thinking something like:

printf("Enter phrase> ");
scanf("this is where i'm lost to scan multiple words");
printf("here too");

Code:

#include <stdio.h>
#include <string.h>
#include <conio.h>

void reverse (char *s, int len)
{
  int i, j;

  for (i = 0, j = len - 1; i < j; i++, j--) {
    char save = s[i];
    s[i] = s[j];
    s[j] = save;
  }
}

void revword (char *s)
{
  while (*s != '\0') {
    char *e = s;
    /* Find the end of a word */
    while (*e != '\0' && !isspace (*e))
      e++;
    reverse (s, e - s);
    /* Find the next word */
    s = e;
    while (*s != '\0' && isspace (*s))
      s++;
  }
}


int main (void)
{
  char s[] = ("apples and oranges");
  reverse (s, strlen (s));
  revword (s);
  puts (s);

  getch();
  return 0;
}

more than 3 words is possible, so:

how now brown cow

=

cow brown now how

Code:

#include <stdio.h>
#include <string.h>
#include <ctype.h>

char *mystrrev(char *s, size_t size)
{
   char *start = s, *t = s + size;
   for ( --t ; s < t; ++s, --t )
   {
      char temp = *s;
      *s = *t;
      *t = temp;
   }
   return start;
}

char *foo(char *s)
{
   char *start = s, *t = s;
   while ( *s )
   {
      while ( *t && !isspace(*t) )
      {
         ++t;
      }
      mystrrev(s, t - s);
      while ( *t && isspace(*t) )
      {
         ++t;
      }
      s = t;
   }
   return start;
}

int main()
{
   char text[] = "how now brown cow";
   puts(text);
   puts(mystrrev(text, strlen(text)));
   puts(foo(text));
   return 0;
}

/* my output
how now brown cow
woc nworb won woh
cow brown now how
*/

Code:

char s[] = ("apples and oranges");

->

Code:

char s[] = "apples and oranges";