View Compilation Error

0_0_22431067_26384.cpp: In function 'int main()':
0_0_22431067_26384.cpp:5:23: error: 'scanf' was not declared in this scope
    while(scanf("%f",&r)!=EOF)
                       ^
0_0_22431067_26384.cpp:5:26: error: 'EOF' was not declared in this scope
    while(scanf("%f",&r)!=EOF)
                          ^
0_0_22431067_26384.cpp:7:33: error: 'printf' was not declared in this scope
     printf("%.3f\n",r*r*r*PI*4/3);
                                 ^