View Compilation Error

0_0_29874577_6361.c: In function 'main':
0_0_29874577_6361.c:5:5: error: address of register variable 'val' requested
     while (~scanf("%d", &val)) {
     ^
0_0_29874577_6361.c:6:9: error: address of register variable 'val' requested
         printf("%d\n", val[val[0]]);
         ^