用scanf判断是不是行末尾

int main(void){int a[5],len;char endline;for (int i = 0; i < 5; ++i){scanf("%d%c",&a[i],&endline);len=i+1;if(endline=='\n') break;//遇到回车就停止}// for (int i = 0; i < len; ++i)// {// printf("a[%d]=%d\n",i,a[i] );// }// int b[5];// for (int i = 0; i < 5; ++i)// scanf("%d",&b[i]);// for (int i = 0; i < 5; ++i)// printf("b[%d]=%d\n",i,b[i] );return 0;}

如何用scanf判断是不是回车