字符串中的子串替换

用字符串s代替主串中指定的子字符串，两者长度不一定相等

#include <iostream>#include <string>using namespace std;void StrReplace(char* strSrc, const char* strFind, const char*strReplace);//原串、原串中待替换的串，替换串 (替换串和待替换的串长度不一定相等)int main(){    string strFind,strReplace;    cout << "Input the start string :" << endl;    char *s = new char[100];    /*gets(s)(可直接调用，不用另外赋值给字符指针)是直接读取字符串到buffer中，不检查是否越界，gets_s有对长度的控制，超过会有提醒，fgets()从文件中读取*/    gets_s(s,100);      cout << "Input the sub_string to be replaced :" << endl;    getline(cin,strFind);    const char *sub_str = strFind.c_str();    cout << "Input the replacement:" << endl;    getline(cin,strReplace);    const char *replace = strReplace.c_str();    StrReplace(s,sub_str,replace);    cout << "The end string after the replacement:" << endl;    cout << s << endl;    return 0;}void StrReplace(char* strSrc, const char* strFind, const char*strReplace){    int n = strlen(strFind);    /*因为strFind 和strReplace长度不一定相等，所以不能直接在strSrc中处理，需要额外创建一个空间，存储替换后的字符串*/    char *temp = new char[100];        char *q = temp;    char *s = strSrc;    const char *p = strReplace;    while(*s != '\0')    {        if(strncmp(s,strFind,n) == 0)        {                while (*p != '\0')                {                    *q = *p;                    q++;                    p++;                }                p = strReplace;                s += n;        }        else        {            *q = *s;            s++;            q++;        }    }    *q = '\0';    strcpy(strSrc,temp);}