#include "stdafx.h"
#include<stdio.h>
int main(void)
{
    char ch;
    int a_ct, e_ct, i_ct, o_ct, u_ct;
    a_ct = e_ct = i_ct = o_ct = u_ct = 0;
    printf("Enter some text : enter # to quit:\n");
    while((ch = getchar()) != '#')
    {
        switch(ch)
        {
        case 'a':
        case 'A': a_ct++;
            break;
            case 'e':
        case 'E': e_ct++;
            break;
            case 'I':
        case 'i': i_ct++;
            break;
            case 'o':
        case 'O': a_ct++;
            break;
            case 'u':
        case 'U': a_ct++;
            break;
        default:break;
    }
    printf("number of vowels: AEIOU\N");
    printf("          %4d %4d %4d %4d\n,
           a_ct, e_ct, i_ct, o_ct, u_ct");
    }
           getchar();
    return 0;
}

不清楚你要干什么，改了一下，看看行不行。

#include<stdio.h>
int main(void)
{
    char ch;
    int a_ct, e_ct, i_ct, o_ct, u_ct,other=0;
    a_ct = e_ct = i_ct = o_ct = u_ct = 0;
    printf("Enter some text : enter # to quit:\n");
    while((ch = getchar()) != '#')
    {
        switch(ch)
        {
        case 'a':
        case 'A':a_ct++;break;
            
        case 'e':
        case 'E':e_ct++;break;
            
        case 'I':
        case 'i':i_ct++;break;
            
        case 'o':
        case 'O':o_ct++;break;
            
        case 'u':
        case 'U':u_ct++;break;
            
        default:other++;break;
        }
   
           
    }
    printf("number of vowels: AEIOU\n");
    printf("a_ct=%4d\ne_ct=%4d\ni_ct=%4d\no_ct=%4d\nu_ct=%4d\nother=%4d\n",a_ct, e_ct, i_ct, o_ct, u_ct,other);
   
           getchar();
    return 0;
}

交个朋友
可以吗？494157227

看不懂啊
真是一头雾水
看看我是不太菜

统计元音的数目（大小写）