View Compilation Error

0_0_19433986_1924.cpp: In function 'int main()':
0_0_19433986_1924.cpp:5:16: error: 'scanf' was not declared in this scope
  scanf("%lf",&m);
                ^
0_0_19433986_1924.cpp:22:20: error: 'printf' was not declared in this scope
 printf("%.2f\n",sum);
                    ^