C 解法, 执行用时: 1ms, 内存消耗: 416K, 提交时间: 2022-10-29 20:47:54

int main()
{
	char c;
	while(~scanf("%c",&c))
	{
		if(isalpha(c))
		   printf("%c is an alphabet.\n",c);
		else
		   printf("%c is not an alphabet.\n",c);	   
		getchar();
	}
}

C++11(clang++ 3.9) 解法, 执行用时: 5ms, 内存消耗: 480K, 提交时间: 2018-12-27 14:50:21

#include<stdio.h>
int main()
{int a;
while(~scanf("%s",&a))
if(a>=65&&a<=122)
    printf("%s is an alphabet.\n",&a);
else
printf("%s is not an alphabet.\n",&a);
return 0;
}

Python3(3.5.2) 解法, 执行用时: 38ms, 内存消耗: 3564K, 提交时间: 2018-12-25 02:03:35

while 1:
    try:
        x = input()
        print(x, 'is' + ('' if x.isalpha() else ' not'), 'an alphabet.')
    except:
        break