专题：字符串

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1.字符串的替换

#include <iostream>using namespace std;void strcopy(char *des, char *src)      //字符串的复制{    while (*des++ = *src++);}char* mystrcat(char *src1, char *src2, char *res)   //字符串的连接{    int src1_len = strlen(src1);    int src2_len = strlen(src2);    res = new char[src1_len + src2_len];    for (int i = 0; i < src1_len; i++)    {        res[i] = src1[i];    }    for (int i = 0; i < src2_len; i++)    {        res[i + src1_len] = src2[i];    }    res[src1_len + src2_len] = '\0';    return res;}char* StrReplace(char *strSrc, char *strFind, char *strReplace){    int strFind_len = strlen(strFind);    int strReplace_len = strlen(strReplace);    int i;    for (i = 0; i <strlen(strSrc); i++)    {        int strcompare = strncmp(strSrc + i, strFind, strFind_len);        if (strcompare == 0)        {            int strSrc_len = strlen(strSrc);            int remainlen = strSrc_len - i - strFind_len;            char *temp = new char[remainlen];           //存储strSrc的strFind之后的后部分的字符            strcopy(temp, strSrc + i + strFind_len);            cout << "temp:::" << temp << endl;                      char *result = new char[i];                 //存储strSrc的strFind之后的前部分的字符            for (int j = 0; j < i; j++)                result[j] = strSrc[j];            result[i] = '\0';                   //这个表示字符串的结束，很重要！！！            char *result1 = new char[i + strReplace_len];       //result1:用于存储strSrc在strFind的前部分的字符以及strReplace            result1 = mystrcat(result, strReplace, result1);            cout << ".............." << result1 << endl;            strSrc = new char[i + strReplace_len + remainlen];            strSrc = mystrcat(result1, temp, strSrc);           //用于存放替换后的字符            strSrc[i + strReplace_len + remainlen] = '\0';      //标识字符的结束    //      StrReplace(newstrSrc, strFind, strReplace);        }    }    return strSrc;}int main(){    char *strSrc = "RSTABCDEFGHIJKLMNOPQRSTUVWRSTXYZRST";    char *strFind = "RST";    char *strReplace = "12345";    //  StrReplace(strSrc, strFind, strReplace);    int n = strlen(strSrc);    cout << n << endl;    strSrc = StrReplace(strSrc, strFind, strReplace);    cout << endl;    cout << strSrc << endl;    cout << endl;    /*用于做测试子过程部分的代码    char *res1 = new char[strlen(strFind)];    strcopy(res1, strFind);    cout << res1 << endl;    char *res = new char[strlen(strFind) + strlen(strReplace)];    res = mystrcat(strFind, strReplace, res);    res[strlen(strFind) + strlen(strReplace)] = '\0';    cout << res << endl;    */    system("pause");    return 0;}

2.字符串的反转

把”cba” 称为 “abc”的反转串

public class ReverseString {    public static String reverse(String s){        if (s.length() < 2 || s == null)            return s;        else            return reverse(s.substring(1)) + s.charAt(0);    }    public static void main(String[] args){        String s = "123456";        String ss = reverse(s);        System.out.println(ss);    }

!后面会陆续更新这个课题的

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