View Compilation Error

0_0_30848922_13739.cpp: In function 'int main()':
0_0_30848922_13739.cpp:6:26: error: 'scanf' was not declared in this scope
  while(scanf("%d%d",&n,&m))
                          ^
0_0_30848922_13739.cpp:16:24: error: 'printf' was not declared in this scope
       printf("%d ",a[i]);
                        ^
0_0_30848922_13739.cpp:23:24: error: 'printf' was not declared in this scope
      printf("%d\n",a[n]);
                        ^