View Compilation Error

0_0_16037613_21587.cpp: In function 'int main()':
0_0_16037613_21587.cpp:30:12: error: 'EOF' was not declared in this scope
     while (EOF != scanf("%d", &num))
            ^
0_0_16037613_21587.cpp:30:35: error: 'scanf' was not declared in this scope
     while (EOF != scanf("%d", &num))
                                   ^
0_0_16037613_21587.cpp:34:35: error: 'printf' was not declared in this scope
         printf("%d\n", countP(num));
                                   ^