/*
   testchar2.cpp
   CIS 150
   David Klick
   6/30/05
   
   Making simple upper/lower case functions.
*/

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

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

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

// This function converts a string to lowercase.
// Warning: It modifies the input string.
void makeLowerCase(char* str) {
   while (*str != '\0') {
      *str = tolower(*str);
      str++;
   }
}

// This function converts a string to uppercase.
// Warning: It modifies the input string.
void makeUpperCase(char* str) {
   while (*str != '\0') {
      *str = toupper(*str);
      str++;
   }
}

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