View Compilation Error

0_0_33105318_9239.cpp: In function 'int main()':
0_0_33105318_9239.cpp:4:29: error: 'scanf' was not declared in this scope
   scanf("%d%d%d", &a, &b, &n);
                             ^
0_0_33105318_9239.cpp:28:24: error: 'printf' was not declared in this scope
     printf("%d\n", f[n]);
                        ^
0_0_33105318_9239.cpp:30:40: error: 'printf' was not declared in this scope
     printf("%d\n", f[(n-start)%t+start]);
                                        ^