程序代码：

void showmenu()
{
    printf("\t\t---------------------------\n");
    printf("\t\t        英汉电子辞典       \n"); 
    printf("\t\t---------------------------\n");
    printf("\t\t***    【1】显示词条    ***\n");
    printf("\t\t***                     ***\n");
    printf("\t\t***    【2】查找词条    ***\n");
    printf("\t\t***                     ***\n");
    printf("\t\t***    【3】修改词条    ***\n");
    printf("\t\t***                     ***\n");
    printf("\t\t***    【4】  退出      ***\n");
    printf("\t\t---------------------------\n");
    printf("\t\t        请选择："); 
}

void selectmenu()
{
    int sel;
    scanf("%d",&sel);     //这边怎么做成循环
    switch(sel)
    {
    case 1:show_dictionary();break;
    case 2:search(); break;
    case 3:modify(); break;
    case 4:exit(0);
    }
}