/in/foo.cc: In function 'int main()':
/in/foo.cc:6:7: error: conflicting declaration 'char c'
  char c;
       ^
/in/foo.cc:5:14: note: previous declaration as 'int c'
  int a=0,b=0,c=0,d=0,i;
              ^
/in/foo.cc:5:18: warning: unused variable 'd' [-Wunused-variable]
  int a=0,b=0,c=0,d=0,i;
                  ^
/in/foo.cc:5:22: warning: unused variable 'i' [-Wunused-variable]
  int a=0,b=0,c=0,d=0,i;
                      ^