C++ 调试错误 -Abort() 已被调用
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Debug Error -Abort() Has Been Called
提问by MNada
I'm trying to enter a number,n and get the least super lucky number that is more than or equal to n. Super lucky: it's decimal representation contains equal amount of digits 4 and 7. For example, numbers 47, 7744, 474477 are super lucky and 4, 744, 467 are not.
我正在尝试输入一个数字，n 并获得大于或等于 n 的最少超级幸运数字。超级幸运：它的十进制表示包含等量的数字 4 和 7。例如，数字 47、7744、474477 是超级幸运，而 4、744、467 则不是。
Here's my code
这是我的代码
#include<iostream>
#include<string>
using namespace std;
void superLucky(int n,string s, int count4, int count7)
{
if (s.size() > 10)
return;
if (( stoi(s) >= n ) && (count4 == count7) && (count4+count7)!=0)
{
cout << s << endl;
return;
}
superLucky(n, s + '4', count4+1, count7);
superLucky(n, s + '7',count4,count7+1);
}
int main()
{
int n;
cin >> n;
superLucky(n, "", 0, 0);
return 0;
}
Once I input some integer I get debug error R6010 - abort() has been called. What this means ? and how can I fix this ?
一旦我输入了一些整数，我就会收到调试错误 R6010 - abort() 已被调用。这是什么意思？我该如何解决这个问题？
采纳答案by R Sahu
There are couple of issues:
有几个问题：
When you call
superLuckyfrommain,sis empty.stoi(s)throws an exception whensis empty.The check
s.size() > 10is not robust. It is platform dependent. You can use atry/catchblock to deal with it instead of hard coding a size.
当您调用
superLuckyfrom 时main，s是空的。为空stoi(s)时抛出异常s。该检查
s.size() > 10不可靠。它依赖于平台。您可以使用try/catch块来处理它而不是硬编码大小。
Here's a more robust version of the function.
这是该函数的更强大版本。
void superLucky(int n,string s, int count4, int count7)
{
int d = 0;
if ( s.size() > 0 )
{
try
{
d = stoi(s);
}
catch (...)
{
return;
}
if (( d >= n ) && (count4 == count7) && (count4+count7)!=0)
{
cout << s << endl;
return;
}
}
superLucky(n, s + '7',count4,count7+1);
superLucky(n, s + '4', count4+1, count7);
}
回答by Yifu Wang
It's probably because stoi()have thrown an invalid_argumentexception.
可能是因为stoi()抛出了invalid_argument异常。
回答by Igor Tandetnik
On the first call to superLucky, you pass an empty string to std::stoi. When unable to perform the conversion, stoithrows an exception. That exception is not caught, so uncaught_exceptiongets called, which in turn calls abort
在第一次调用 时superLucky，您将一个空字符串传递给std::stoi。当无法执行转换时，stoi抛出异常。那个异常没有被捕获，所以uncaught_exception被调用，然后调用abort
