View Compilation Error

0_0_30526749_10921.cpp: In function 'int main()':
0_0_30526749_10921.cpp:7:27: error: 'scanf' was not declared in this scope
  while(~scanf("%d%d",&x,&y)&&(x!=0||y!=0))
                           ^
0_0_30526749_10921.cpp:17:28: error: 'printf' was not declared in this scope
   if(flag==0) printf("OK\n");
                            ^
0_0_30526749_10921.cpp:18:25: error: 'printf' was not declared in this scope
    else printf("Sorry\n");   
                         ^