View Compilation Error

0_0_31441402_27938.cpp: In function 'int main()':
0_0_31441402_27938.cpp:3:25: error: 'scanf' was not declared in this scope
     while((scanf("%d",&n))!=EOF&&n)
                         ^
0_0_31441402_27938.cpp:3:29: error: 'EOF' was not declared in this scope
     while((scanf("%d",&n))!=EOF&&n)
                             ^
0_0_31441402_27938.cpp:11:28: error: 'printf' was not declared in this scope
         printf("%d\n\n",sum);
                            ^