请问下面代码为什么无法运行呢？

[Andox]

#include <iostream>
#include <string>

using std::cin;
using std::cout;
using std::endl;
using std::string;

string greet(string form,string lastName,string title,
             string::size_type pos,int lenght){
                    string::iterator beg,end;
                    beg = form.begin() + form.find("Daily");
                    end = form.end() - 1;
                    form.replace(beg,end,lastName);
                    beg = form.begin() + form.find("Ms");
                    end = beg + 1;
                    form.replace(beg,end,title.substr(pos,7));
                    return form;
             }
int main()
{
    string generic1("Dear Ms Daisy:");
    string generic2("MrsMsMissPeople");
    string lastName("AnnaP");
    string salute = greet(generic1,lastName,generic2,5,4);
    cout << salute << endl;
    return 0;
}

以上代码运行后会出现如下提示
This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

Process returned 3 (0x3) execution time : 0.187 s
Press any key to continue.

还有一个程序运行后也出现相同提示。实在不明白，请各位赐教。

[Aniao]

beg = form.begin() + form.find("Daily");

这里有问题，最后一个Daily是找不到的，返回的不是你想要的。因为你的字符串是"Dear Ms Daisy:"，Daisy，不是Daily

[Freedom]

你这beg 和end 设置成迭代器 并不是反回的是字符串的起始位置 和结束位置 你何以试试
beg = form.begin() + form.find("Daily");
这个 cout<<beg<<endl;
输入的是
Dear Ms Daisy:
你再好好看看

[机器再学习]

#include <iostream>
#include <string>

using std::cin;
using std::cout;
using std::endl;
using std::string;

string greet(string form,string lastName,string title,string::size_type pos/*,int lenght*/)
{
string::iterator beg,end;
beg = form.begin() + form.find("Daily");
end = form.end() - 1;
form.replace(beg,end,lastName);
beg = form.begin() + form.find("Ms");
end = beg + 1;
form.replace(beg,end,title.substr(pos,7));
return form;
}
int main()
{
string generic1("Dear Ms Daily:");
string generic2("MrsMsMissPeople");
string lastName("AnnaP");
string salute = greet(generic1,lastName,generic2,5/*,4*/);
cout << salute << endl;
system("pause");
return 0;
}

[zxs421819166]

好像那个length没有用到，注释掉就可以运行了，结果是"Dear MissPeos AnnaP:",不知道可是你要得到的结果

[Andox]

谢谢大家。看样是我马虎了。