View Compilation Error

0_0_23425832_799.cpp: In function 'int main()':
0_0_23425832_799.cpp:5:24: error: 'scanf' was not declared in this scope
     while(scanf("%d",&m)==1)
                        ^
0_0_23425832_799.cpp:18:32: error: 'printf' was not declared in this scope
             printf("%.2f\n",sum);
                                ^