View Compilation Error

0_0_35419383_8877.cpp: In function 'int main()':
0_0_35419383_8877.cpp:4:22: error: 'scanf' was not declared in this scope
   while(scanf("%d",&n),n){
                      ^
0_0_35419383_8877.cpp:15:26: error: 'printf' was not declared in this scope
   printf("%d %d %d",a,b,c);
                          ^