View Compilation Error

0_0_16053559_9227.cpp: In function 'int main()':
0_0_16053559_9227.cpp:10:31: error: 'scanf' was not declared in this scope
     while(scanf("%lf%lf",&n,&m)!=EOF)
                               ^
0_0_16053559_9227.cpp:10:34: error: 'EOF' was not declared in this scope
     while(scanf("%lf%lf",&n,&m)!=EOF)
                                  ^
0_0_16053559_9227.cpp:18:28: error: 'printf' was not declared in this scope
         printf("%.2f\n",sum);
                            ^