/*
   testchar2.cpp
   CIS 150
   David Klick
   7/3/08
   
   This program demonstrates how to create and use
   simple upper/lower case functions.
*/

#include <iostream>
#include <cctype>
using std::cin;
using std::cout;

void makeLowerCase(char* str);
void makeUpperCase(char* str);
void cont();

int main() {
   char sample[] = "This is Dave's test string!";
   
   cout << sample << '\n';
   makeLowerCase(sample);
   cout << sample << '\n';
   makeUpperCase(sample);
   cout << sample << '\n';
   
   cont();
   return 0;
}

/*
   void makeLowerCase(char* str);
   
   Arguments:
      char* str: a pointer to the string to be modified
   
   Returns: nothing
   
   This function converts a string to lowercase.
   Warning: It modifies the input string.
*/
void makeLowerCase(char* str) {
   while (*str != '\0') {
      *str = tolower(*str);
      str++;
   }
}

/*
   void makeUpperCase(char* str);
   
   Arguments:
      char* str: a pointer to the string to be modified
   
   Returns: nothing
   
   This function converts a string to uppercase.
   Warning: It modifies the input string.
*/
void makeUpperCase(char* str) {
   while (*str != '\0') {
      *str = toupper(*str);
      str++;
   }
}

/*
   void cont();
   
   Arguments: none
   
   Returns: nothing
   
   Clears input buffer and pauses waiting for user 
   to press Enter.
*/
void cont() {
   if (cin.rdbuf()->sungetc() != -1 && cin.get() != '\n') cin.ignore(80,'\n');
   cout << "Press enter to continue...";
   cin.get();
}

/*
   Sample output:
   
   This is Dave's test string!
   this is dave's test string!
   THIS IS DAVE'S TEST STRING!
*/