View Compilation Error

0_0_13278969_23729.cpp: In function 'int main()':
0_0_13278969_23729.cpp:11:19: error: 'scanf' was not declared in this scope
  for(scanf("%d",&t);t--;)
                   ^
0_0_13278969_23729.cpp:17:31: error: 'printf' was not declared in this scope
    printf("Case %d: lose\n",ca);
                               ^
0_0_13278969_23729.cpp:35:31: error: 'printf' was not declared in this scope
    printf("Case %d: lose\n",ca);
                               ^
0_0_13278969_23729.cpp:48:32: error: 'printf' was not declared in this scope
   printf("Case %d: %d\n",ca,ans);
                                ^