Main.cc:1:10: error: #include expects "FILENAME" or
#include
^
Main.cc: In function 'void fun()':
Main.cc:10:19: error: 'printf' was not declared in this scope
printf("%d\n",a);
^
Main.cc: At global scope:
Main.cc:21:11: error: '::main' must return 'int'
void main() {
^