View Compilation Error

0_0_32979303_28054.cpp: In function 'int main()':
0_0_32979303_28054.cpp:4:25: error: 'scanf' was not declared in this scope
     while(scanf("%lf",&r)!=EOF)
                         ^
0_0_32979303_28054.cpp:4:28: error: 'EOF' was not declared in this scope
     while(scanf("%lf",&r)!=EOF)
                            ^
0_0_32979303_28054.cpp:6:17: error: 'PI' was not declared in this scope
         v=(4/3)*PI*(r*r*r);
                 ^
0_0_32979303_28054.cpp:7:27: error: 'printf' was not declared in this scope
         printf("%.3lf\n",v);
                           ^