View Compilation Error

0_0_23379791_12797.cpp: In function 'int main()':
0_0_23379791_12797.cpp:4:21: error: expected primary-expression before '%' token
  while(scanf("%d%d",%a,%b)!=EOF)
                     ^
0_0_23379791_12797.cpp:4:24: error: expected primary-expression before '%' token
  while(scanf("%d%d",%a,%b)!=EOF)
                        ^