判断两个字符相似度

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public static double SimilarityNoContains(string a, string b)
{
    string a1 = "";
    string b1 = "";
    if (a==b)
    {
        return 1;
    }
    
   
    //消除重复
    for (int i = 0; i < a.Length; i++)
    {
        string emtpy = a.Substring(i, 1).ToString();
        if (a1.Length == 0)
        {
            a1 = emtpy;
        }
        if (a1.IndexOf(emtpy, 0) < 0)
        {
            a1 += emtpy;
        }
    }
    //消除重复
    for (int i = 0; i < b.Length; i++)
    {
        string emtpy = b.Substring(i, 1).ToString();
        if (b1.Length == 0)
        {
            b1 = emtpy;
        }
        if (b1.IndexOf(emtpy, 0) < 0)
        {
            b1 += emtpy;
        }
    }
    //计算相似度
    if (a1.Length >= b1.Length)
    {
        int q = 0;
        for (int i = 0; i < b1.Length; i++)
        {
            for (int j = 0; j < a1.Length; j++)
            {
                if (b1.Substring(i, 1).ToString() == a1.Substring(j, 1).ToString())
                {
                    q += 1;
                }
            }
        }
        System.Globalization.NumberFormatInfo provider = new System.Globalization.NumberFormatInfo();
        provider.PercentDecimalDigits = 2;//小数点保留几位数.
        provider.PercentPositivePattern = 1;//百分号出现在何处.
        double result = (double)q / (a1.Length + b1.Length - q);//一定要用double类型.
        return result;
    }
    else
    {
        int q = 0;
        for (int i = 0; i < a1.Length; i++)
        {
            for (int j = 0; j < b1.Length; j++)
            {
                if (a1.Substring(i, 1).ToString() == b1.Substring(j, 1).ToString())
                {
                    q += 1;
                }
            }
        }
        System.Globalization.NumberFormatInfo provider = new System.Globalization.NumberFormatInfo();
        provider.PercentDecimalDigits = 2;//小数点保留几位数.
        provider.PercentPositivePattern = 1;//百分号出现在何处.
        double result = (double)q / (a1.Length + b1.Length - q);//一定要用double类型.
        return result;
 
    }
 
 
}

  

posted @   逊老头  阅读(286)  评论(0编辑  收藏  举报
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