/in/foo.cc: In function 'int main()':
/in/foo.cc:6:15: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  if(a='A'||'a')
               ^
/in/foo.cc:8:20: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  else if(a='B'||'b')
                    ^
/in/foo.cc:10:22: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
    else if(a='C'||'c')
                      ^
/in/foo.cc:12:28: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
          else if(a='D'||'d')
                            ^
/in/foo.cc:14:2: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
  else 
  ^~~~
/in/foo.cc:16:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
   return 0;
   ^~~~~~