[编程入门]字符串分类统计-题解(C语言代码)

#include<stdio.h>
int main()
{
	int chara = 0, num = 0, space = 0, other = 0;
	int ch;
	ch = getchar();
	while (ch != '\n')
	{
		if (ch>= 'A' && ch<= 'Z'||ch>='a'&&ch<='z')
		{
			chara++;
		}
		else if (ch>= '0' && ch<= '9')
		{
			num++;
		}
		else if (ch == ' ')
		{
			space++;
		}
		else
			other++;
		
	}
	printf("%d %d %d %d\n", chara, num, space, other);

	return 0;
}

为啥我的运行时间超限，有大佬帮忙解答一下吗

while((c=getchar())!=’\n’)中的‘  \n’是什么意思？