View Compilation Error

0_0_18289907_6467.cpp:2:11: error: '::main' must return 'int'
 void main()
           ^
0_0_18289907_6467.cpp: In function 'int main()':
0_0_18289907_6467.cpp:6:19: error: 'Printf' was not declared in this scope
    Printf("%d",a+b);
                   ^