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Converting uppercase to lowercase for wide characters

#include <stdio.h> int main(void) {   wchar_t letter = 0;   printf("Enter an uppercase letter:");    scanf("%lc", &letter);                   if(letter >= L'A')     if (letter <= L'Z')     {                         letter = letter - L'A'+ L'a';       printf("You entered an uppercase %lc\n", letter);     }     else                                  printf("Try using the shift key, Bud! I want a capital letter.\n");   return 0; } Enter an uppercase letter:A You entered an uppercase a