输入英文字母后程序运行死循环,scanf接收字母后while中只有1个字符,printf输出后应该把字母读完,缓冲区无字母,为啥还会死循环?且while条件中明确ch1的值不是回车时才能执行循环,即使回车在缓冲区,当到while语句时不满足条件,应该不再循环,为啥还会死循环?
#include<stdio.h>
int main()
{
char ch1;
scanf("%c",&ch1);
while(ch1!='\n')
{
if(ch1>='A'&&ch1<='Z'||ch1>='a'&&ch1<='z')
if(ch1>='W'&&ch1<='Z'||ch1>='w'&&ch1<='z')
ch1=ch1-22;
else
ch1=ch1+4;
printf("%c\n",ch1);
}
return 0;
}