View Compilation Error

0_0_35628413_27198.cpp: In function 'int main()':
0_0_35628413_27198.cpp:4:24: error: 'scanf' was not declared in this scope
     while(scanf("%d",&n)!=EOF){
                        ^
0_0_35628413_27198.cpp:4:27: error: 'EOF' was not declared in this scope
     while(scanf("%d",&n)!=EOF){
                           ^
0_0_35628413_27198.cpp:12:24: error: 'printf' was not declared in this scope
       printf("%d\n",sum);}
                        ^
0_0_35628413_27198.cpp:13:14: error: 'printf' was not declared in this scope
   printf("\n");
              ^