应用switch 语句，

1 #include
     
       2 int main(void) 3 {    char ch; 4     int a_ctl,e_ctl,i_ctl,o_ctl,u_ctl; 5     a_ctl = e_ctl = i_ctl = o_ctl = u_ctl =0; 6     printf("        Enter some text,and a # to quit\n" 7         "        I will tell you the number of the vowel\n"    ); 8     while((ch=getchar()) != '#') 9     {10         switch(ch)11         {12             case 'A':13             case 'a': a_ctl++;break;14             case 'E':15             case 'e': e_ctl++;break;16             case 'I':17             case 'i': i_ctl++;break;18             case 'O':19             case 'o': o_ctl++;break;20             case 'U':21             case 'u': u_ctl++;break;// 保留此处的break，为了方便以后添加其他选项 22             default: break;23         }24         25     }26     printf("number of vowels: \n"27         "a:%d    e:%d    i:%d    o:%d    u:%d\n",a_ctl,e_ctl,i_ctl,o_ctl,u_ctl);28     return 0;29 }
     

刚开始 把printf放在 while循环里面了，结果就悲剧了·····以后注意哈