View Compilation Error

0_0_35424266_14790.cpp: In function 'int main()':
0_0_35424266_14790.cpp:13:20: error: 'scanf' was not declared in this scope
 while(scanf("%d",&n),n){
                    ^
0_0_35424266_14790.cpp:27:44: error: 'printf' was not declared in this scope
        printf("%d%c",a[i],(i<n-1)?' ': '\n');
                                            ^