View Compilation Error

0_0_23937217_18378.cpp: In function 'int main()':
0_0_23937217_18378.cpp:4:18: error: 'scanf' was not declared in this scope
     scanf("%d",&t);  
                  ^
0_0_23937217_18378.cpp:25:33: error: 'printf' was not declared in this scope
         printf("Case #%d: ",ca++);  
                                 ^
0_0_23937217_18378.cpp:26:31: error: 'puts' was not declared in this scope
         if(win==1)puts("Alice");  
                               ^
0_0_23937217_18378.cpp:27:34: error: 'puts' was not declared in this scope
         else if(win==2)puts("Bob");  
                                  ^