C ++将字符串转换为整数 [英] C++ converting string into integer

问题描述

问候大家，

我目前正在尝试制作一个程序，该程序可以将用户输入的字符串转换为int.
我希望该整数最大为4,294,967,295.我目前正在使用stoi将字符串转换为无符号的int，但是每次我尝试输入10位数字的数字时，都会弹出错误"abort()已被调用".我来这里是为了弄清楚我的代码出了什么问题.

Greetings everybody,

I am currently trying to make a program that can will convert a string that is input by a user into a int.
I want this integer to be up to 4,294,967,295. I am currently using stoi to convert the string into an unsigned int, but everytime I try to input a number that is 10 digits long, an error "abort() has been called" pops up. I''ve come here to figure out what the issue is with my code.

#include <iostream>
#include <string>

using namespace std;

int main()
{

	cout << "4,294,967,295" << endl;
	string numberString;
	
	getline(cin, numberString);

	unsigned int number = stoi(numberString);

	cout << number << endl;

	return 0;
}

提前谢谢！

问候

我尝试过的事情:

我尝试使用无符号的长整型，双精度型，但都无法正常运行

Thanks in advance!

Regards

What I have tried:

I''ve tried using unsigned long, double but both do not work

推荐答案

那个4 ....数字是2 ^ 32-1，超出了范围为32位int，返回类型为stoi.它是可以表示为UNSIGNED int的最大数字，因此您需要使用stoul或其他将返回大于有符号int的数字的东西.另外，也可以将sscanf用于％u之类的转换或更大的转换.

That 4.... number is 2^32-1, which is beyond the range of a 32 bit int, the return type of stoi. It is the largest number that can be expressed as an UNSIGNED int, so you need to use stoul or something else that will return numbers bigger than a signed int. Alternatively, you could use sscanf with a conversion like %u or something "bigger".

stoi用于转换带符号的32位整数，该整数可以保存的最大值为2,147,483,647.您应该捕获从stoi引发的out_of_range异常.并且请删除您的数字字符串中的逗号.

std :: stoi，std :: stol，std :: stoll-cppreference.com [ ^ ]

另一种选择是使用字符串流将您的字符串转换为数字.

stoi is for converting signed 32 bit integer whose maximum value it can hold is 2,147,483,647. You should catch the out_of_range exception thrown from stoi. And please remove the commas in your number string.

std::stoi, std::stol, std::stoll - cppreference.com[^]

Another alternative is to use string streams to convert your strings to numbers.

#include <sstream>
#include <iostream>

int main()
{
	unsigned int n = 0;
	std::istringstream oss("4294967295");
	oss >> n;
	std::cout << n << std::endl;
    return 0;
}

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