View Compilation Error

0_0_15374369_18997.c:7:25: error: expected ';', ',' or ')' before '&' token
 LL exgcd(LL a, LL b, LL &x, LL &y) {
                         ^
0_0_15374369_18997.c: In function 'main':
0_0_15374369_18997.c:31:2: error: expected declaration or statement at end of input
  }
  ^