写完数据敲了回车之后程序直接结束，没有结果

我想用代码写出读出数字的拼音，这个代码输入了数据之后直接就结束了，没有结果，为啥

# include<stdio.h>
int main()
{
    char c;
    while((c = getchar())!='\n')
    {
      switch(c)
      {
      case 0:printf("ling");
      case 1:printf("yi");
      case 2:printf("er");
      case 3:printf("san");
      case 4:printf("si");
      case 5:printf("wu");
      case 6:printf("liu");
      case 7:printf("qi");
      case 8:printf("ba");
      case 9:printf("jiu");
      case '-':printf("fu");
      
    }
    }
  return 0;
}

#include <stdio.h>
int main()
{
    char c;
    while ((c = getchar()) != '\n')
    {
        switch (c)
        {
        case '0':
            printf("ling");
            break;
        case '1':
            printf("yi");
            break;
        case '2':
            printf("er");
            break;
        case '3':
            printf("san");
            break;
        case '4':
            printf("si");
            break;
        case '5':
            printf("wu");
            break;
        case '6':
            printf("liu");
            break;
        case '7':
            printf("qi");
            break;
        case '8':
            printf("ba");
            break;
        case '9':
            printf("jiu");
            break;
        case '-':
            printf("fu");
            break;
        }
    }
    return 0;
}

代码修改如下

# include<stdio.h>
int main()
{
    char c;
    while((c = getchar())!='\n')
    {
        switch(c)
        {
        case '0':
            printf("ling");
            break;
        case '1':
            printf("yi");
            break;
        case '2':
            printf("er");
            break;
        case '3':
            printf("san");
            break;
        case '4':
            printf("si");
            break;
        case '5':
            printf("wu");
            break;
        case '6':
            printf("liu");
            break;
        case '7':
            printf("qi");
            break;
        case '8':
            printf("ba");
            break;
        case '9':
            printf("jiu");
            break;
        case '-':
            printf("fu");
            break;
        default:
            break;
        }
    }
    return 0;
}

# include<stdio.h>
int main()
{
    char c;
    while ((c = getchar()) != '\n')
    {
        switch (c)
        {
        case '0':printf("ling"); break;
        case '1':printf("yi"); break;
        case '2':printf("er"); break;
        case '3':printf("san"); break;
        case '4':printf("si"); break;
        case '5':printf("wu"); break;
        case '6':printf("liu"); break;
        case '7':printf("qi"); break;
        case '8':printf("ba"); break;
        case '9':printf("jiu"); break;
        case '-':printf("fu"); break;
        }
    }
    return 0;
}