学校网站提交有问题，什么原因
B.c: In function 'input':
B.c:9:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
9 | scanf("%d",&n);
| ^~~~~~~~~~~~~~
B.c: In function 'input':
B.c:9:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
9 | scanf("%d",&n);
| ^~~~~~~~~~~~~~