View Compilation Error

0_0_35048464_2944.cpp: In function 'int main()':
0_0_35048464_2944.cpp:4:2: error: expected initializer before 'scanf'
  scanf("%d%d", &a, &b);
  ^
0_0_35048464_2944.cpp:5:21: error: 'b' was not declared in this scope
  printf("%d\n", a + b);
                     ^