View Compilation Error

0_0_30932300_16613.cpp:4:8: error: 'b' has not been declared
  int a,b,sum;
        ^
0_0_30932300_16613.cpp:4:10: error: 'sum' has not been declared
  int a,b,sum;
          ^
0_0_30932300_16613.cpp:4:13: error: expected ')' before ';' token
  int a,b,sum;
             ^
0_0_30932300_16613.cpp:4:13: error: expected constructor, destructor, or type conversion before ';' token
0_0_30932300_16613.cpp:5:3: error: 'a' does not name a type
   a=123;
   ^
0_0_30932300_16613.cpp:6:4: error: 'b' does not name a type
    b=456;
    ^
0_0_30932300_16613.cpp:7:4: error: 'sum' does not name a type
    sum=a+b;
    ^
0_0_30932300_16613.cpp:8:9: error: expected constructor, destructor, or type conversion before '(' token
   printf("%d\n",sum);
         ^
0_0_30932300_16613.cpp:9:2: error: expected unqualified-id before 'return'
  return 0;
  ^
0_0_30932300_16613.cpp:10:1: error: expected unqualified-id before ')' token
 )
 ^