在字符串中找出连续最长的英文字符串

叁歲伎倆 2022-06-13 09:27 208阅读 0赞

1、不区分大小写  
2、返回连续最长串的长度  
3、拷贝给新串  
例如：输入123abcdefg2141as324  
返回最长字串为abcdefg  
字串长度为7

--------------------

#include <stdio.h>
    #include <stdlib.h>
    
    int is_zimu(char ch)
    {
        if (ch >= 'a' && ch <= 'z' || ch >= 'A' && ch <= 'Z')
            return 1;
        else
            return 0;
    }
    
    int find_string(char* inputstr, char* outputstr)
    {
        char* pMove = inputstr;
        char* pOutStrHead = NULL;
        int outStrLen = 0;
        int len = 0;
    
        while (*pMove != '\0')
        {
            if (is_zimu(*pMove))
            {
                //统计每个英文字母字串的长度
                len = 0;
                char *pStrTemp = pMove;
                while (is_zimu(*pMove))
                {
                    len++;
                    pMove++;
                }
                if (len > outStrLen)
                {
                    outStrLen = len;
                    pOutStrHead = pStrTemp;
                }
            }
            else
            {
                pMove++;
            }
        }
        int copyLen = outStrLen;
        while (copyLen--)   //复制字符串到输出串中
        {
            *outputstr++ = *pOutStrHead++;
        }
    
        return outStrLen;
    }
    
    
    int main()
    {
        char inputstr[128] = { 0 };
        char outputstr[128] = { 0 };
        scanf("%s", inputstr);
    
        int ret = find_string(inputstr, outputstr);
    
        printf("returnlen = %d\n", ret);
        printf("outputstr = %s\n", outputstr);
        system("pause");
        return 0;
    }

测试结果：

zxv32vj23v32v2525cv45c3b5vhjbj3j2b5j2v51v32v52
    returnlen = 5
    outputstr = vhjbj
    请按任意键继续. . .