View Compilation Error

0_0_19217432_7261.cpp: In function 'int main()':
0_0_19217432_7261.cpp:20:22: error: 'scanf' was not declared in this scope
  while(~scanf("%d",&n) && n)
                      ^
0_0_19217432_7261.cpp:36:19: error: 'printf' was not declared in this scope
   printf("%d = ",n) ;
                   ^
0_0_19217432_7261.cpp:51:10: error: 'puts' was not declared in this scope
   puts("") ;
          ^