/in/foo.cc: In function 'int main()':
/in/foo.cc:3:9: warning: variable 'b' set but not used [-Wunused-but-set-variable]
  char a,b;
         ^
/in/foo.cc:5:5: warning: 'a' is used uninitialized in this function [-Wuninitialized]
  b=a+32;
    ~^~~