C++字符串的查找与替换

[djglpy521]

要求手动输入一段正文
输入要替换的字符串
出入替换的字符串
替换要循环

[djglpy521]

就像将abc you abc you abc you abc youf中的abc全部替换成you
变成you you you you you you you you一样 但要求原字符串与查找字符串要输入，替代字符串也要用手动输入
并完成替换 急求 请各位大神帮忙

[modicum_lf]

void f(char *Src, char *DisPlace)
{
    int len = strlen(DisPlace) + 1;
    char * tmp = (char*)malloc(len);
    memset(tmp, 0, strlen(DisPlace) + 1 );

    for (int i = 0; i < ( strlen(Src) + 1); ++ i)
    {
        memcpy(tmp, Src, len);
        if( 0 == strcmp(tmp, DisPlace ) )
        {
             memcpy(Src, tmp, len);
             i += len;
        }
    }


}

[rendao0563]

这段代码可用. 不过效率比较低. 对效率有要求请用C方式.

    static inline std::string ReplaceString(std::string strSrc,std::string strPos,std::string strStr)
    {
        std::basic_string<char>::iterator IterL;
        std::basic_string <char>::size_type indexCh1a = 0;
        std::basic_string <char>::size_type off = 0;
        std::string result6a = strSrc;
        if (strPos.empty())
        {
            return strSrc;
        }
        while((indexCh1a = strSrc.find(strPos,off)) != std::string::npos)
        {
            IterL = strSrc.begin( ) + indexCh1a;
            off = indexCh1a + strStr.size();
            result6a = strSrc.replace( IterL , IterL+strPos.size() , strStr );
        }
        return result6a;
    }

[zjs100901]

替换要循环是不是指下面情况？
源字符串aabcc，将abc替换为b，则aabcc -> abc -> b
还是仅仅就像记事本里的全部替换而己？

[hongwenjun]

#include <iostream>
#include <string>

int main()
{
    using namespace std;
    string str = "Hello world!   Hello world!   Hello world!  Hello world! ";
    string s1 = "Hello";
    string s2 = "你好世界！";

    size_t pos = str.find(s1);
    while (pos != string::npos) {
        str.replace(pos, s1.length(), s2);
        pos = str.find(s1);
    }

    cout << str << endl;
    return 0;
}