View Compilation Error

0_0_23125648_12968.cpp: In function 'int main()':
0_0_23125648_12968.cpp:4:31: error: 'scanf' was not declared in this scope
     while(scanf("%lf%lf",&n,&m)!=EOF)
                               ^
0_0_23125648_12968.cpp:4:34: error: 'EOF' was not declared in this scope
     while(scanf("%lf%lf",&n,&m)!=EOF)
                                  ^
0_0_23125648_12968.cpp:9:18: error: 'sqrt' was not declared in this scope
          n=sqrt(n);
                  ^
0_0_23125648_12968.cpp:12:24: error: 'printf' was not declared in this scope
      printf("%.2lf\n",s);
                        ^