View Compilation Error

0_0_24800364_20691.cpp:2:11: error: '::main' must return 'int'
 void main(){
           ^
0_0_24800364_20691.cpp: In function 'int main()':
0_0_24800364_20691.cpp:4:27: error: expected primary-expression before ')' token
 while(scanf("%d",&n)!=EOF)){
                           ^