我是异常的新手,我试图改进我的一位朋友在求职面试中提出的问题解决方案。
我的朋友被要求构建一个程序,它将获得2个数组并找到一个数字,如果我们将它除以第一个数组的成员,我们将获得第二个数组的匹配剩余部分。
在这种情况下,我可以使用std :: exception而不使用任何继承类吗?
CPP文件
#include <iostream>
#include <exception>
#include "FindNumber.h"
Finder::Finder() : m_num(0)
{}
int Finder::FindFirst(int* _divided, int* _leftOver, int _size)
{
int indx = 0;
while(indx < _size)
{
if (!_divided[indx])
{
throw("Can not divide by zero!!");
}
if (m_num % _divided[indx] != _leftOver[indx])
{
++m_num;
FindRest(_divided, _leftOver, _size);
indx = 0;
}
++indx;
}
return m_num;
}
int Finder::FindRest(int* _divided, int* _leftOver, int _size)
{
int indx = 0;
for(;;)
{
if (!_divided[indx])
{
throw("Can not divide by zero!!");
}
if (m_num % _divided[indx] != _leftOver[indx])
{
++m_num;
}
else
{
break;
}
}
return m_num;
}
试验单位
#include <cstdio>
#include <iostream>
#include "FindNumber.h"
#include "mu_test.h"
#define SIZE 5
/****************************** FN_check1 ******************************/
UNIT(FN_check1)
int divided [SIZE] = {0, 4, 5, 6, 7};
int leftOver [SIZE] = {2, 0, 3, 2, 1};
Finder find1;
try
{
ASSERT_THAT(6 != find1.FindFirst(divided, leftOver, SIZE));
ASSERT_THAT(8 == find1.FindFirst(divided, leftOver, SIZE));
}
catch(std::exception& e)
{
std::cout << e.what();
}
END_UNIT
/****************************** FN_check2 ******************************/
UNIT(FN_check2)
int divided [SIZE] = {6, 12, 8, 10, 7};
int leftOver [SIZE] = {0, 0, 4, 2, 5};
Finder find1;
ASSERT_THAT(6 != find1.FindFirst(divided, leftOver, SIZE));
ASSERT_THAT(12 == find1.FindFirst(divided, leftOver, SIZE));
std::cout << find1.FindFirst(divided, leftOver, SIZE) << std::endl;
END_UNIT
TEST_SUITE(FindNumber_test)
TEST(FN_check1)
TEST(FN_check2)
END_SUITE
提前致谢...
下面用于抛出异常的行:
if (!_divided[indx]) {
throw("Can not divide by zero!!");
}
你是throw
ing一个字符串(实际上是const char*
),它显然不会继承你后来尝试捕获的std::exception
。您可以尝试throw std::runtime_error("Can not divide by zero!!");
或投掷std::invalid_argument
,以适合每种情况为准。异常发生的原因似乎是错误消息已知。