如何存储在C程序很长的整数值考试： - 98474737475747374739399 [英] How to store a very long integer value in a C program for an exam :- 98474737475747374739399

问题描述

我要存储整数类型的一个很长的价值不能被保存在的可变长键入。我怎么能这样存储在C程序中一个长整型值。
如果可能的话，请说明它是通过一个例子/程序。

I have to store a very long value of type integer that can't be stored in a variable of long type. How can I store such a long integer value in a C programme. Please illustrate it through an example/ programme, if possible.

推荐答案

想想用结构像这样存储的数字为十进制数字序列：

Think about storing a numbers as sequences of decimal digits using a struct like this:

struct num {
    int ndigits;
    char d[MAXDIGITS];
};

例如，数123456可以初始化为

For example, the number 123456 could be initialized as

struct num n = { 6, { 6, 5, 4, 3, 2, 1 } };

该转位顺序原来是容易计算的重要。特别是，该位值 ND [I] 是 ND [I] * 10 ^我。

现在，有几个问题：

• 您会如何添加一个到 NUM ？


• 您会怎样添加任意一个数字到 NUM ？


• 您会如何添加两个 NUM 取值在一起吗？


• 您会如何乘以 NUM 由两个？


• 您会如何乘以 NUM 由一个单一的数字？


• 您会如何乘以 NUM 10？


• 你将如何将两个 NUM 取值在一起吗？提示：做一些铅笔和纸张乘法，看看它们是如何工作的

• How would you add one to a num?
• How would you add an arbitrary single digit to a num?
• How would you add two nums together?
• How would you multiply a num by two?
• How would you multiply a num by a single digit?
• How would you multiply a num by 10?
• How would you multiply two nums together? HINT: Do some pencil and paper multiplications and see how they work.

如果您通过的问题，这一系列的工作，你应该能够编写一个函数每一步，并重新使用这些功能来回答以后的问题，并用一个非常简单的和未经优化的长结束了（哦，在这到 MAXDIGIT 位）整数包正数的加法和乘法。

If you work through this sequence of questions, you should be able to write a function for each step, and re-use those functions to answer the later questions, and end up with a very simple and unoptimized long (well, up to MAXDIGIT digits) integer package for addition and multiplication of positive numbers.

其他问题：

• 你如何概括 NUM 重新present负数以及积极的？


• 如何划分有一个 NUM 由另一个（忽略余数）？这比乘棘手，但同样，通过做一些铅笔和纸长师开始，仔细想想你做什么。

• How do you generalize num to represent negative numbers as well as positive?
• How do you divide one num by another (ignoring remainders)? This is trickier than multiplication, but again, start by doing a few pencil and paper long divisions and think carefully about what you do.

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