题目：写一个函数，将一个字符串中的元音字母（AOEIUVaoeiuv）复制到另一个字符串中，然后输出
以下是我写的代码：
#include<stdio.h>
void fuzhi(char buf[])
{
    char uf,ioi[100]={'\0'};
    int i,x;
    for (i=0,x=0;buf[i]!='\0';x++)
    {
        switch (buf[i])
        {
            case 'A':
                uf=buf[i];
                break;
            case 'a':
                uf=buf[i];
                break;
            case 'O':
                uf=buf[i];
                break;
            case 'o':
                uf=buf[i];
                break;
            case 'E':
                uf=buf[i];
                break;
            case 'e':
                uf=buf[i];
                break;
            case 'I':
                uf=buf[i];
                break;
            case 'i':
                uf=buf[i];
                break;
            case 'U':
                uf=buf[i];
                break;
            case 'u':
                uf=buf[i];
                break;
            case 'V':
                uf=buf[i];
                break;
            case 'v':
                uf=buf[i];
                break;
            default:uf=' ';
        }ioi[x]=uf;
    }
    printf("%s",ioi);        
}
void main(void)
{
    char str[100];
    printf("请输入一个字符串：\t\n");
    gets(str);
    printf("%s\t\n",str);
    fuzhi(str);

}

抱歉，没有考虑到，谢谢

谢谢，很好用，但是有点不理解