View Compilation Error

0_0_27743145_18956.cpp: In function 'int main()':
0_0_27743145_18956.cpp:5:17: error: expected primary-expression before '%' token
     while(scanf(%d %d,&a,&b))
                 ^
0_0_27743145_18956.cpp:5:18: error: 'd' was not declared in this scope
     while(scanf(%d %d,&a,&b))
                  ^