Statistical information file character length

The number of characters to obtain a document which, the number of letters, numbers, number, number of words, the number of non-whitespace characters, the average total number of words.
Code is as follows:
Calculate.h Code:

#include <iostream>

using namespace std;
void calculate();

Main.cpp Code:

#include "calculate.h"

//这是测试数字123
void main() {
	calculate();
}

Calculate.cpp Code:

#include "calculate.h"
#include <fstream>

void calculate() {
	bool ing = false;
	char a;
	int x = 0; //字符总数
	int y = 0;//数字总数
	int z = 0;//字母总数
	int k = 0;//单词数量
	ifstream list("main.cpp");//读取main.cpp的内容
	while (list.get(a))//输出main.cpp的内容
	{
		x++;
		if (a>='a'&& a <= 'z'|| a >= 'A' && a <= 'Z')//判断是否为字母
		{
			z++;
			ing = true;//判断为字母的时候bool为真
		}
		else if (a == ' ' || a == '\n' || a == '\t' || a =='.')//判断是否是空格
		{
			if (ing == true) {//判断为bool是否为真，为真就进行自增
				k++;
				ing = false;//自增后将bool改为假
			}
		}
		else if (a >= '0'&&a<='9') {//判断是否是数字
			y++;
			if (ing == true) {//判断为bool是否为真，为真就进行自增
				k++;
				ing = false;//自增后将bool改为假
			}
		}
	}
	if (ing == true) {//判断结束以后最后一个是否为字母单词，为真就进行自增
		k++;
		ing = false;//自增后将bool改为假
	}
	cout << "字符总数：" << x << "个" << endl;
	cout << "字母总数：" << z << "个" << endl;
	cout << "数字总数：" << y << "个" << endl;
	cout << "单词总数：" << k << "个" << endl;
	cout << "非空白字符总数：" << z+y << "个" << endl;
	cout << "平均单词总数：" << z/k << "个" << endl;
	list.close();//关闭输入

	ofstream out("Output.txt");//输出到文本
	out << "字符总数：" << x << "个" << endl
	<< "字母总数：" << z << "个" << endl
	<< "数字总数：" << y << "个" << endl
	<< "单词总数：" << k << "个" << endl
	<< "非空白字符总数：" << z+y << "个" << endl
	<< "平均单词总数：" << z/k << "个" << endl;
	out.close();//关闭输出
}

Operating results are as follows:

generate txt file

txt file content