字数是整数 [英] Word count that are integer

问题描述

给出样品字符串你好，有200个苹果，每个苹果重100到300克。我必须计算像200,100,300这样的整数字数。怎么做。 C，C ++中的任何代码片段都可以。



我尝试过：



我无法弄清楚逻辑。我不知道如何从字符串中提取整数

Given a sample string "hello there are 200 apples and each apple weighs 100 to 300 grams". I have to count number of words which are integers like 200,100,300. How to do it. any code snippets in C, C++ will do .

What I have tried:

I cant figure a logic. I have no idea about how to extract integers from string

推荐答案

尝试，例如：

Try, for instance:

 #include <iostream>
 #include <string>
 #include <sstream>
 #include <cstdlib>
 using namespace std;

int main()
{
  string line = "hello there are 200 apples and each apple weighs 100 to 300 grams";

  istringstream iss(line);

  while ( iss.good() )
  {
    char *pe;
    string s;
    iss >> s;
    long l = strtol(s.c_str(), &pe, 10);
    if ( *pe == '\0')
      cout << l << endl;
  }

}

这很容易分两步完成。



1.用字符串标记器将字符串（substring）中的字符串拆分。已经处理过此处。

2.如果是 atoi 整数，则测试所有子字符串。



您只需要strtok和atoi函数并编写一些代码。 ; - ）

That is really easy done in 2 step.

1. split the string in words (substring) with a string tokenizer. Already handled here.
2. test all substring if the are integers with atoi.

You need only the strtok and atoi functions and write some code. ;-)

Quote：

如何做到这一点。 C，C ++中的任何代码片段都可以。

How to do it. any code snippets in C, C++ will do .

我们不做你的HomeWork。

HomeWork不会测试你的技能，乞求别人去做做你的工作，它会让你思考并帮助你的老师检查你对你所学课程的理解，以及你应用它们时遇到的问题。

你的任何失败都会帮助你的老师发现你的弱点并设定补救措施。

所以，试一试，重读你的课程并开始工作。如果您遇到特定问题，请显示您的代码并解释这个问题，我们可能会提供帮助。



作为程序员，您的工作是创建算法解决特定问题，你不能依赖别人永远为你做，所以有一段时间你必须学会​​如何。而且越快越好。

当你要求解决方案时，就像试图通过培训其他人来学习开车一样。

We do not do your HomeWork.
HomeWork is not set to test your skills at begging other people to do your work, it is set to make you think and help your teacher to check your understanding of the courses you have taken and also the problems you have at applying them.
Any failure of you will help your teacher spot your weaknesses and set remedial actions.
So, give it a try, reread your lessons and start working. If you are stuck on a specific problem, show your code and explain this exact problem, we might help.

As programmer, your job is to create algorithms that solve specific problems and you can't rely on someone else to eternally do it for you, so there is a time where you will have to learn how to. And the sooner, the better.
When you just ask for the solution, it is like trying to learn to drive a car by having someone else training.

引用：

我无法弄清楚逻辑。我不知道如何从字符串中提取整数

I cant figure a logic. I have no idea about how to extract integers from string

你必须考虑如何用一张纸和一支铅笔来完成它。

You have to think to how you would do it with a sheet of paper and a pencil.

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