View Compilation Error

0_0_23214783_26511.cpp: In function 'int main()':
0_0_23214783_26511.cpp:4:28: error: 'scanf' was not declared in this scope
  while (scanf("%d %d",&m,&n) && m != 0 && n != 0)
                            ^
0_0_23214783_26511.cpp:8:27: error: 'printf' was not declared in this scope
    printf("What a pity!\n");
                           ^
0_0_23214783_26511.cpp:12:25: error: 'printf' was not declared in this scope
    printf("Wonderful!\n");
                         ^