View Compilation Error

0_0_39653391_21942.cpp: In function 'int main()':
0_0_39653391_21942.cpp:4:9: error: 'scanf' was not declared in this scope
    4 |         scanf("%d",&n);
      |         ^~~~~
0_0_39653391_21942.cpp:11:9: error: 'printf' was not declared in this scope
   11 |         printf("%d\n",sum);
      |         ^~~~~~
0_0_39653391_21942.cpp:1:1: note: 'printf' is defined in header '<cstdio>'; did you forget to '#include <cstdio>'?
  +++ |+#include <cstdio>
    1 | int main()