View Compilation Error

0_0_14838615_19135.cpp:1:11: error: '::main' must return 'int'
 void main(){
           ^
0_0_14838615_19135.cpp: In function 'int main()':
0_0_14838615_19135.cpp:4:27: error: 'scanf' was not declared in this scope
       while((scanf("%d",&n))!=EOF){
                           ^
0_0_14838615_19135.cpp:4:31: error: 'EOF' was not declared in this scope
       while((scanf("%d",&n))!=EOF){
                               ^
0_0_14838615_19135.cpp:14:48: error: 'printf' was not declared in this scope
           printf("%.2f\n",(count-min-max)/(n-2));
                                                ^