View Compilation Error

0_0_19215509_18696.cpp: In function 'int main()':
0_0_19215509_18696.cpp:19:21: error: 'scanf' was not declared in this scope
  while(scanf("%d",&n)!=EOF){
                     ^
0_0_19215509_18696.cpp:19:24: error: 'EOF' was not declared in this scope
  while(scanf("%d",&n)!=EOF){
                        ^
0_0_19215509_18696.cpp:20:34: error: 'printf' was not declared in this scope
   if(n<=fibs)printf("%d\n",fib[n]);
                                  ^
0_0_19215509_18696.cpp:24:37: error: 'printf' was not declared in this scope
     printf("%d\n",(int)pow(10,tmp+3));
                                     ^