View Compilation Error

0_0_18654417_31345.cpp: In function 'int main()':
0_0_18654417_31345.cpp:3:25: error: 'scanf' was not declared in this scope
     while(scanf("%d", &n)!=EOF) {  
                         ^
0_0_18654417_31345.cpp:3:28: error: 'EOF' was not declared in this scope
     while(scanf("%d", &n)!=EOF) {  
                            ^
0_0_18654417_31345.cpp:6:29: error: 'printf' was not declared in this scope
         printf("%d\n\n", sum);  
                             ^