View Compilation Error

1_728_1270_6411.cpp: In function 'int main()':
1_728_1270_6411.cpp:6:18: error: 'scanf' was not declared in this scope
     scanf("%d",&t);
                  ^
1_728_1270_6411.cpp:11:34: error: 'printf' was not declared in this scope
         printf("Case #%d: ",cas++);
                                  ^
1_728_1270_6411.cpp:18:9: error: 'ekse' was not declared in this scope
         ekse
         ^