View Compilation Error

0_0_20755026_24650.cpp: In function 'int main()':
0_0_20755026_24650.cpp:6:1: error: expected initializer before 'scanf'
 scanf("%d%d",&a,&b);
 ^
0_0_20755026_24650.cpp:7:15: error: 'b' was not declared in this scope
 printf("%d",a+b);
               ^