View Compilation Error

0_0_30555446_4854.cpp: In function 'int main()':
0_0_30555446_4854.cpp:5:4: error: expected initializer before 'scanf'
    scanf("%d%d",&a,&b);
    ^
0_0_30555446_4854.cpp:7:23: error: 'b' was not declared in this scope
       printf("%d\n",a+b);
                       ^