switch C++
时间: 2023-09-04 21:11:16 浏览: 42
在C语言中,switch语句是一种用于根据不同的条件执行不同的代码块的结构。它根据某个表达式的值来选择要执行的代码块。下面是一个例子展示了如何使用switch语句来打印一位数的中文数字:
```
#include <iostream>
using namespace std;
int main() {
int num = 6 ;
switch (num) {
case 0:
cout << "零" << endl;
break;
case 1:
cout << "一" << endl;
break;
case 2:
cout << "二" << endl;
break;
case 3:
cout << "三" << endl;
break;
case 4:
cout << "四" << endl;
break;
case 5:
cout << "五" << endl;
break;
case 6:
cout << "六" << endl;
case 7:
cout << "七" << endl;
break;
case 8:
cout << "八" << endl;
break;
case 9:
cout << "九" << endl;
break;
default:
cout << "数字不在0-9之间!" << endl;
break;
}
return 0;
}
```
通过运行以上代码,如果num的值为6,将会输出"六"。而如果num的值超出了0-9的范围,将会输出"数字不在0-9之间!"。
此外,switch语句还可以使用贯穿(cases fall-through)的方式来进行合理的应用。这意味着如果多个case后面没有使用break语句,那么程序将会继续执行后面的case,直到遇到break语句或者switch语句结束为止。下面是一个利用贯穿实现判断数字奇偶性的例子:
```
#include <iostream>
using namespace std;
int main() {
int num = 6 ;
switch (num) {
case 0:
case 2:
case 4:
case 6:
case 8:
cout << "num是偶数!" << endl;
break;
case 1:
case 3:
case 5:
case 7:
case 9:
cout << "num是奇数!" << endl;
break;
default:
cout << "数字不在0-9之间!" << endl;
break;
}
return 0;
}
```
在这个例子中,如果num的值为6,将会输出"num是偶数!"。因为在case 6的代码块中没有break语句,所以程序会继续执行后面的case 7、case 8等代码块,直到遇到break语句或者switch语句结束为止。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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