/* File: upper2.c

   Change lower case characters to upper case.
   Alternate while loop
*/



#include <stdio.h>

#define MAXLEN 255


void upper_case (char str[])  ;
   
int main() {
   char m_str[MAXLEN] ;

   printf("Enter string: ")  ;
   scanf("%[^\n]s", m_str) ;

   upper_case(m_str) ;

   printf("Mangled string: %s\n", m_str) ;

   return 0 ;
}



void upper_case(char str[]) {
   int i = 0 ;
   char c ;

   while ( (c = str[i]) ) {    // assignment!

      if (c >= 'a' && c <= 'z')  {
         str[i] -= ('a' - 'A') ;         
      }

      i++ ;
   }

   return ;
}