View Compilation Error

0_0_13812362_13429.cpp: In function 'int n()':
0_0_13812362_13429.cpp:9:21: error: 'scanf' was not declared in this scope
  while(scanf("%d",&n)!=EOF){
                     ^
0_0_13812362_13429.cpp:9:24: error: 'EOF' was not declared in this scope
  while(scanf("%d",&n)!=EOF){
                        ^
0_0_13812362_13429.cpp:10:38: error: 'printf' was not declared in this scope
   printf("%lld,%lld\n",high[n],low[n]);
                                      ^