View Compilation Error

0_0_32314945_22251.cpp: In function 'int main()':
0_0_32314945_22251.cpp:3:23: error: 'scanf' was not declared in this scope
   while(scanf("%d", &n) != EOF) {
                       ^
0_0_32314945_22251.cpp:3:28: error: 'EOF' was not declared in this scope
   while(scanf("%d", &n) != EOF) {
                            ^
0_0_32314945_22251.cpp:9:28: error: 'printf' was not declared in this scope
     printf("%d\n\n", result);
                            ^