c++的异常处理中采用了try 语句测试代码块的错误。 catch 语句处理错误。throw 语句创建自定义错误。
创建自定义错误是什么样的啦?如下验证:
#include<queue>
#include<stdio.h>
using namespace std;
struct node
{
int a;
}nod[100];
bool operator< (node x,node y)
{
return x.a>y.a;
}
int main()
{
int a=1;
int b=0;
if(b==0) throw 1; //抛出异常程序崩溃
// int c=a/b;
// catch(int)
// {
// printf("除数为0\n");
// }
return 0;
}
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)
和直接运行a/b一样运行崩溃。再添加try catch语句后有什么区别啦:
#include<queue>
#include<stdio.h>
using namespace std;
struct node
{
int a;
}nod[100];
bool operator< (node x,node y)
{
return x.a>y.a;
}
int main()
{
try{
int a=1;
int b=0;
if(b==0) throw 1;
int c=a/b;
}
catch(int)
{
printf("除数为0\n");
}
return 0;
}
结果: 除数为0;
即try得到throw抛出的信息,catch去对这个异常做处理,就将这个异常吞下了。假如异常不是由throw抛出的try也就没用了(所以良好的异常处理机制很重要),比如直接运行a/b就会崩溃,而上段代码中程序再throw后就不会执行后面的代码了。对程序经行良好的throw try设计能良好的处理程序的异常。这种用法在析构函数中是相当重要的因为c++尽量不回让异常出现在析构函数否者会出现不明确行为。