View Compilation Error

0_0_26989502_2412.cpp:3:1: error: expected initializer before 'int'
 int sum,a=3,b=4;
 ^
0_0_26989502_2412.cpp:4:1: error: 'sum' does not name a type
 sum=a+b;
 ^
0_0_26989502_2412.cpp:5:7: error: expected constructor, destructor, or type conversion before '(' token
 printf("%d",sum);
       ^
0_0_26989502_2412.cpp:6:1: error: expected unqualified-id before 'return'
 return 0;
 ^