Listing 1: Demonstrates trouble using cin.get

// reversit.cpp   use cin.get(),
// reverse spelling of a word or phrase.
//#define STDIO

#include <string.h>
#ifdef STDIO
#include <stdio.h>
#else
#include <iostream.h>
#endif

// prototype
void reversit(char[]);
// prototype
void swapchar(char *cp1, char *cp2);

// max string length
const int MAX=80;
// global for watching in debug mode
char str[MAX];

int main(void)
{
    char yesno;
    const char *prompt =
       "\nEnter a word or a phrase to \
       reverse:\n";
    do
    {
        str[0] = '\0';
#ifdef STDIO
        printf(prompt);
        gets(str);
#else
        cout << prompt;
        // read in phrase,
        // include blanks.
        cin.get(str, MAX);
#endif


        reversit(str);

#ifdef STDIO
        printf("\nThe reverse is:\n%s\n
               "\nDo another? y/n", str);
        yesno = getchar();
        // discard ALL characters
        // in buffer
        fflush(stdin);
#else
        cout << "\nThe reverse is:\n"
             << str
             << "\n\nDo another? y/n";
        cin >> yesno;
        // discard ONE character
        cin.ignore();
#endif
    } while (yesno == 'y');
    return (0);
}

// function to reverse string
void reversit(char s[])
{
    // index of last character (not \0)
    int j = (strlen(s)-1);
    // nothing to do if strlen == 0
    if (j<0) return;
    for (int i = 0; i <= j/2; i++)
        swapchar(&s[i], &s[j-i]);
}

//function to swap characters
void swapchar(char *cp1, char *cp2)
{
    char temp = *cp1;
    *cp1 = *cp2;
    *cp2 = temp;
}

// end of reversit.cpp
//End of File