C 解法, 执行用时: 1ms, 内存消耗: 304KB, 提交时间: 2021-07-21

#include <stdio.h>

int main ()
{int ch=0;
 while(scanf("%c\n",&ch)!=EOF)
 {
     //if((ch>='A'&&ch<='Z')||(ch>='a'&&ch<='z'))
     if(isalpha(ch))
     {printf("%c is an alphabet.\n",ch);}
     else
     {printf("%c is not an alphabet.\n",ch);}
 }
return  0;
}

C 解法, 执行用时: 1ms, 内存消耗: 308KB, 提交时间: 2021-09-07

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

C 解法, 执行用时: 1ms, 内存消耗: 312KB, 提交时间: 2021-05-05

#include "stdio.h"
int main()
{
    char a;
    while(scanf("%c",&a)!=EOF){
        getchar();
        if((a>='A'&&a<='Z')||(a>='a'&&a<='z'))
        {
            printf("%c is an alphabet.\n",a);
        }
        else
            printf("%c is not an alphabet.\n",a);
    }
    return 0;
}

C 解法, 执行用时: 1ms, 内存消耗: 316KB, 提交时间: 2020-12-20

#include<stdio.h>
int main()
{
    char a;
    while(scanf("%c",&a)!=EOF)
    {
        if(a<='Z'&&a>='A')
            printf("%c is an alphabet.\n",a);
        else if(a<='z'&&a>='a')
            printf("%c is an alphabet.\n",a);
        else if(a=='\n')
            continue;
        else
            printf("%c is not an alphabet.\n",a);
    }
    return 0;
}

C 解法, 执行用时: 1ms, 内存消耗: 328KB, 提交时间: 2021-09-13

#include <stdio.h>
int main(){
    char a;
    while(scanf("%c\n",&a) != EOF){
        if((a>='a'&&a<='z')||(a>='A'&&a<='Z')){
            printf("%c is an alphabet.\n",a);
            }
                    else{
                printf("%c is not an alphabet.\n",a);
        }
    }
}