View Compilation Error

0_0_33343116_2431.c:6:24: error: expected ';', ',' or ')' before '&' token
 void exgcd(LL a,LL b,LL& d,LL& x,LL& y)
                        ^
0_0_33343116_2431.c: In function 'main':
0_0_33343116_2431.c:59:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int i=0; i<I; i++)
         ^
0_0_33343116_2431.c:59:9: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code