View Compilation Error

0_0_15213030_18781.c: In function 'main':
0_0_15213030_18781.c:6:18: error: expected expression before '%' token
     while (scanf(%d %d", &a, &b) == 2)
                  ^
0_0_15213030_18781.c:6:18: error: missing terminating " character
0_0_15213030_18781.c:10:1: error: expected ')' before '}' token
 }
 ^
0_0_15213030_18781.c:10:1: error: expected expression before '}' token