View Compilation Error

0_0_27743107_2017.cpp: In function 'int main()':
0_0_27743107_2017.cpp:4:11: error: expected initializer before 'b'
     int a b;
           ^
0_0_27743107_2017.cpp:5:17: error: expected primary-expression before '%' token
     while(scanf(%d %d,&a,&b)!=EOF)
                 ^
0_0_27743107_2017.cpp:5:18: error: 'd' was not declared in this scope
     while(scanf(%d %d,&a,&b)!=EOF)
                  ^
0_0_27743107_2017.cpp:5:24: error: 'a' was not declared in this scope
     while(scanf(%d %d,&a,&b)!=EOF)
                        ^
0_0_27743107_2017.cpp:5:27: error: 'b' was not declared in this scope
     while(scanf(%d %d,&a,&b)!=EOF)
                           ^