switch (book_choice)
{
case 1:
book1();
// missing break;
case 2:
book2();
// missing break;
case 3:
book3();
// missing break;
default:
break;
}
You forgot to use break; after each case. The default behaviour in a switch is to fall through and execute the next case. That means you always end up executing book3() and setting your book to "Python Programming".
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该错误在于
book_choiceswitch：您忘记在每种情况下忘记使用
break;。开关中的默认行为是掉落并执行下一个情况。这意味着您总是最终执行book3（），并将您的书设置为“ Python编程”。The error lies in the
book_choiceswitch:You forgot to use
break;after each case. The default behaviour in a switch is to fall through and execute the next case. That means you always end up executingbook3()and setting your book to"Python Programming".