C语言多重标签实例

// vowels.c -- uses multiple labels
#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' :  o_ct++;
                break;
            case 'u' :
            case 'U' :  u_ct++;
                break;
            default :   break;
        }                    // end of switch
    }                        // while loop end
    printf("number of vowels:   A    E    I    O    U\n");
    printf("                 %4d %4d %4d %4d %4d\n",
           a_ct, e_ct, i_ct, o_ct, u_ct);

    return 0;
}