C 语言实例 - 判断元音/辅音

完善一楼多个字符输入错误的问题:

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <ctype.h>

int main()
{
    char cLetter,b,a;
    int iInRange, iCheck, i, iLetter;
    i = 1;
    while (i)
    {
        printf("输入一个字母, 判断元音与辅音. 如果想退出,请输入“0”。\n");
        scanf("%c", &a);
        cLetter=a;
    scanf("%c", &a);

        while(a!=10 )
        {  

        scanf("%c", &a);
        }
        //getchar();//getchar is must get a key input and CR
        printf("----------------------------------------------------------------------\n");
        iLetter = (int)cLetter;
        iCheck = isalpha(iLetter);
        if (iCheck)
        {
            iInRange = (cLetter == 'a') || (cLetter == 'e') || (cLetter == 'i') || (cLetter == 'o') || (cLetter == 'u') || (cLetter == 'A') || (cLetter == 'E') || (cLetter == 'I') || (cLetter == 'O') || (cLetter == 'U');
            if (iInRange)
            {
                printf("字母 %c 是元音字母!\n", cLetter);
                printf("----------------------------------------------------------------------\n");
                continue;
            }
            else
            {
                printf("字母 %c 是辅音字母!\n", cLetter);
                printf("----------------------------------------------------------------------\n");
                continue;
            }
        }
        else if (iCheck == 0)
        {
            if (iLetter != 48)
            {
                printf("Error input!\n");
                printf("----------------------------------------------------------------------\n");
                continue;
            }
            else if ((int)cLetter == 48)
            {
                printf("Bye bye~~~!\n");
                printf("----------------------------------------------------------------------\n");
                i = (int)cLetter - 48;
            }
        }
    }
    return 0;
}

参考方法：

#include <stdio.h>
#include <stdlib.h>

int main() {
    char c;
    printf("请输入一个字母：");
    scanf("%c",&c);
    if ((c>='A'&&c<='Z')||(c>='a'&&c<='z'))
        if (c=='A'||c=='E'||c=='I'||c =='O'||c=='U'||c=='a'||c=='e'||c=='i'||c =='o'||c=='u')
            printf("%c为元音",c);
        else 
            printf("%c为辅音",c);
    else
        printf("Error input!");
    return 0;
}

如果从键盘中输入的不是字母，例如，数字，标点符号，都会输出是辅音。所以我对这个做了一个简单的判定。

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <ctype.h>

int main()
{
    char cLetter;
    int iInRange, iCheck, i, iLetter;
    i = 1;
    while (i)
    {
        printf("输入一个字母, 判断元音与辅音. 如果想退出,请输入“0”。\n");
        scanf("%c", &cLetter);
        getchar();
        printf("----------------------------------------------------------------------\n");
        iLetter = (int)cLetter;
        iCheck = isalpha(iLetter);
        if (iCheck)
        {
            iInRange = (cLetter == 'a') || (cLetter == 'e') || (cLetter == 'i') || (cLetter == 'o') || (cLetter == 'u') || (cLetter == 'A') || (cLetter == 'E') || (cLetter == 'I') || (cLetter == 'O') || (cLetter == 'U');
            if (iInRange)
            {
                printf("字母 %c 是元音字母!\n", cLetter);
                printf("----------------------------------------------------------------------\n");
                continue;
            }
            else
            {
                printf("字母 %c 是辅音字母!\n", cLetter);
                printf("----------------------------------------------------------------------\n");
                continue;
            }
        }
        else if (iCheck == 0)
        {
            if (iLetter != 48)
            {
                printf("Error input!\n");
                printf("----------------------------------------------------------------------\n");
                continue;
            }
            else if ((int)cLetter == 48)
            {
                printf("Bye bye~~~!\n");
                printf("----------------------------------------------------------------------\n");
                i = (int)cLetter - 48;
            }
        }
    }
    return 0;
}