/*
   testpointer4.cpp
   CIS 150
   David Klick
   6/26/08
   
   Using pointers to work with strings.
*/

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

void upper1(char* str);
char* upper2(char* str);
void cont();

int main() {
   char line1[] = "All the King's horses";
   char line2[] = "and all the King's men";

   cout << line1 << '\n';
   cout << line2 << '\n';
      
   // make the strings uppercase and display them
   upper1(line1);
   cout << line1 << '\n';
   cout << upper2(line2) << '\n';
  
   cont();
   return 0;
}

/*
   void upper1(char* str);
   
   Arguments: 
      char* str: C-style string to be converted to uppercase
   
   Returns: Nothing, but modifies string sent in to be uppercase.
   
   Converts C-style string sent in to uppercase. This function
   actually modifies the original string.
*/
void upper1(char* str) {
   upper2(str);
}

/*
   char* upper2(char* str);
   
   Arguments: 
      char* str: C-style string to be converted to uppercase
   
   Returns: A pointer to the original string sent in (which
      will have been converted to uppercase).
   
   Converts C-style string sent in to uppercase. This function
   actually modifies the original string. A pointer to the string
   is returned to make it easy to use this function within other
   expressions.
*/
char* upper2(char* str) {
   char *p = str;
   while (*p != '\0') {
      if (*p >= 'a' && *p <= 'z') {
         *p = *p + ('A' - 'a');
      }
      p++;
   }
   return 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();
}