View Compilation Error

0_0_20594685_18163.cpp: In function 'int main()':
0_0_20594685_18163.cpp:4:18: error: 'scanf' was not declared in this scope
     scanf("%d",&t);
                  ^
0_0_20594685_18163.cpp:25:33: error: 'printf' was not declared in this scope
         printf("Case #%d: ",ca++);
                                 ^
0_0_20594685_18163.cpp:26:31: error: 'puts' was not declared in this scope
         if(win==1)puts("Alice");
                               ^
0_0_20594685_18163.cpp:27:34: error: 'puts' was not declared in this scope
         else if(win==2)puts("Bob");
                                  ^