获取浮点：因子代码中的溢出错误 [英] Getting Floating point: overflow error in factorial code

问题描述

我有一个程序，我在我的课程中使用Turbo C ++在Windows 95或98上我相信。它是为了解决阶乘。问题是：

A）它把它放在指数中

B）有太多的数字要算，所以我需要一种方法将每3位数字放入逗号我不要知道如何做到这一点。

C）超过1754的任何因子给计算机一个错误，上面写着：

浮点数：溢出

这里是我的程序：

i have a program that i made in my class in Turbo C++ on windows 95or98 i belive. it is made to solve for factorials. th problem is that :
A) it puts it in exponents
B) theres too many numbers to count so i need a way to put commas every 3 digits and i dont know how to do that.
C) any factorials over 1754 give the computer an error that says:
Floating point: overflow
here is my program:

展开 | 选择 | Wrap | 行号

推荐答案

1）您正在使用void main（）。这是非标准的，绝对不建议。你应该使用int main（）并在函数末尾返回0。


2）为了用逗号打印数字，你需要把它作为一个字符串来操作而不是数字。如果你把它当作一个字符串，那么一次打印3个字符，然后是逗号，然后重复就很容易了。


3）这些数字是指数，因为它们很大，每个都超过10个数字。


4）你的计算机让你错误，因为它大于1700！对于浮子而言太大了。您可以使用双精度来获得更高的精度，但要意识到阶乘数是巨大的。 1700！ = 1700 * 1699 * 1698 * 1697 * 1696 * ... * 3 * 2 * 1.这是一个非常大的数字。你的程序不能处理比​​这大得多的数字。

1) You are using void main(). This is non-standard and definitely not advised. You should use int main() and return 0 at the end of the function.

2) In order to print the number with commas, you;d need to manipulate it as a string, not a number. If you treat it as a string, it''s an easy task to print 3 characters at a time, then a comma, then repeat.

3) The numbers are in exponents because they are huge, like 10+ digits each.

4) Your computer ives you an error because anything larger then ~1700! is too large for a float to hold. You might e able to use a double for more precision, but realize that factorial numbers are HUGE. 1700! = 1700 * 1699 * 1698 * 1697 * 1696 * ... * 3 * 2 * 1. That''s a MASSIVE number. Your program won''t be able to handle numbers much bigger than this.

我的老师说void main（）适用于我们的编译器。 int main（）也可以工作，但这对问题的解决是无关紧要的。


i还没有真正进入字符串，所以我在那里迷失了。


i完全意识到什么是因子，它有多大。事情是必须有一种方法：

A）摆脱指数并只显示数字和

B）展开它以便我可以展示没有错误的整数。

my teacher says that void main () works with our compiler. int main () also works but thats irrelevent to the solving of the problem.

i havent realy goten into strings yet so im lost there.

i compleatly realize what factorial is and how big it is. the thing is is that there must be a way to:
A) get rid of the exponents and just show the number and
B) expand it so that i can show the whole number without an error.

尝试使用for循环并使用int array / vector进行乘法和加法。多数民众赞成我将如何接近它！

try using for loops and do the multiplication and addition the long way using int array/vector. Thats how I would approach it!

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