Question

Hey, yeah you guessed it homework. I am trying to print a string in reverse using pointers. Only the words though. So “hello world” is “olleh dlrow”.
What I’m doing in the code below is assigning one pointer(pSentence, which is a string array of multiple words passed down from the main function) to a temporary pointer until a space, then increment backwards and print the character from the temporary pointer to the beginning of the word, then do it again. I’m currently stuck, I don’t know how to mark the beginning of the word and increment only to that. I know the while(pt != ‘0’) is not the way to do it at all. The prompt says to store the word into a temporary string(tmpStrg) and use pT to point to it, so maybe I need to do something with tmpStrg? Any help is much appreciated and thank you in advance!!

void prtWords(char *pSentence)
{
    char tmpStrg[81], *pT=tmpStrg;
    int length=0;

    while(*pSentence != '\0')
    {
       while(*pSentence != ' ' && *pSentence != '/0')
       {
         *pT=*pSentence;
         pT++;
         pSentence++;
         length++;
       }
       pSentence++;

       while(length >= 0);
       {
         printf("%c", *pT);
         pT--;
         length--;
       }
    }
}

Answer 1

void prtWords(char *pSentence)
{
    char tmpStrg[81], *pT=tmpStrg;

According to your code, I suppose here you use tmpStrg[81] as a new string for a word, and you print the word in reverse order later.

    int length=0;
    while(*pSentence != '\0')
    {
       while(*pSentence != ' ')
       {

Here is your problem for overflow, you should test \0 and at the same time (and change the second while to a && with first while unchanged). There is no guarantee that a sentence will end with a .

         *pT=*pSentence;
         pT++;
         pSentence++;
         length++;
       }
       pSentence++;
       while(length >= 0);

When length is 0, you should not do anything. Change to >.

       {
         printf("%c", *pT);

You should do pT-- first, because last pT++ does not have an assignment.

         pT--;
         length--;
       }

Here print a when *pSentence == ' '.

    }
}

Work out the full code yourself as it is homework. Any further questions are welcomed.