/in/foo.c: In function 'aa':
/in/foo.c:9:8: error: expected expression before 'long'
    i = long(i*a%(long)A);
        ^
/in/foo.c:10:7: error: expected expression before 'long'
   a = long(a*a%(long)A);
       ^
/in/foo.c:5:14: warning: variable 'a' set but not used [-Wunused-but-set-variable]
   long i = 1,a =2;
              ^