编一道程序分别求定长顺序串的复制，定长顺序串的长度、连接，定长顺序串求子串，定长顺序串的定位，插入、删除、替换，定长顺序串的比较。

以下是一个 C++ 实现的定长顺序串类，包含了所需的各种操作：

#include <iostream>
#include <cstring>

using namespace std;

class FixedString {
private:
    char *data;     // 存储串的数组
    int length;     // 串的长度
public:
    // 构造函数
    FixedString(int length = 0) {
        this->length = length;
        data = new char[length + 1];
        memset(data, 0, length + 1);
    }

    // 复制函数
    FixedString(const FixedString &str) {
        length = str.length;
        data = new char[length + 1];
        memcpy(data, str.data, length + 1);
    }

    // 析构函数
    ~FixedString() {
        delete[] data;
    }

    // 获取串的长度
    int getLength() const {
        return length;
    }

    // 获取指定位置的字符
    char getChar(int index) const {
        if (index >= 0 && index < length) {
            return data[index];
        } else {
            throw "Invalid index";
        }
    }

    // 设置指定位置的字符
    void setChar(int index, char c) {
        if (index >= 0 && index < length) {
            data[index] = c;
        } else {
            throw "Invalid index";
        }
    }

    // 连接两个串
    FixedString concat(const FixedString &str) const {
        FixedString newStr(length + str.length);
        memcpy(newStr.data, data, length);
        memcpy(newStr.data + length, str.data, str.length);
        return newStr;
    }

    // 获取子串
    FixedString substr(int start, int len) const {
        if (start >= 0 && start < length && len >= 0 && start + len <= length) {
            FixedString newStr(len);
            memcpy(newStr.data, data + start, len);
            return newStr;
        } else {
            throw "Invalid start or length";
        }
    }

    // 定位子串
    int indexOf(const FixedString &str) const {
        for (int i = 0; i < length - str.length + 1; i++) {
            bool found = true;
            for (int j = 0; j < str.length; j++) {
                if (data[i + j] != str.data[j]) {
                    found = false;
                    break;
                }
            }
            if (found) {
                return i;
            }
        }
        return -1;
    }

    // 插入子串
    FixedString insert(int index, const FixedString &str) const {
        if (index >= 0 && index <= length) {
            FixedString newStr(length + str.length);
            memcpy(newStr.data, data, index);
            memcpy(newStr.data + index, str.data, str.length);
            memcpy(newStr.data + index + str.length, data + index, length - index);
            return newStr;
        } else {
            throw "Invalid index";
        }
    }

    // 删除子串
    FixedString remove(int start, int len) const {
        if (start >= 0 && start < length && len >= 0 && start + len <= length) {
            FixedString newStr(length - len);
            memcpy(newStr.data, data, start);
            memcpy(newStr.data + start, data + start + len, length - start - len);
            return newStr;
        } else {
            throw "Invalid start or length";
        }
    }

    // 替换子串
    FixedString replace(const FixedString &oldStr, const FixedString &newStr) const {
        FixedString result(*this);
        int index = 0;
        while ((index = result.indexOf(oldStr)) != -1) {
            result = result.remove(index, oldStr.length);
            result = result.insert(index, newStr);
        }
        return result;
    }

    // 比较两个串
    bool equals(const FixedString &str) const {
        if (length != str.length) {
            return false;
        }
        for (int i = 0; i < length; i++) {
            if (data[i] != str.data[i]) {
                return false;
            }
        }
        return true;
    }
};

int main() {
    FixedString str1(10);
    FixedString str2(10);
    str1.setChar(0, 'H');
    str1.setChar(1, 'e');
    str1.setChar(2, 'l');
    str1.setChar(3, 'l');
    str1.setChar(4, 'o');

    str2.setChar(0, 'W');
    str2.setChar(1, 'o');
    str2.setChar(2, 'r');
    str2.setChar(3, 'l');
    str2.setChar(4, 'd');

    // 复制
    FixedString str3(str1);

    // 长度
    cout << "Length of str1: " << str1.getLength() << endl;

    // 连接
    FixedString str4 = str1.concat(str2);
    cout << "Concatenation of str1 and str2: " << str4.getChar(0) << str4.getChar(1) << str4.getChar(2)
         << str4.getChar(3) << str4.getChar(4) << str4.getChar(5) << str4.getChar(6) << str4.getChar(7)
         << str4.getChar(8) << str4.getChar(9) << str4.getChar(10) << str4.getChar(11) << str4.getChar(12)
         << str4.getChar(13) << endl;

    // 子串
    FixedString str5 = str1.substr(1, 3);
    cout << "Substring of str1: " << str5.getChar(0) << str5.getChar(1) << str5.getChar(2) << endl;

    // 定位
    cout << "Index of \"llo\" in str1: " << str1.indexOf(FixedString(3).setChar(0, 'l').setChar(1, 'l').setChar(2, 'o')) << endl;

    // 插入
    FixedString str6 = str1.insert(2, FixedString(3).setChar(0, 'L').setChar(1, 'O').setChar(2, '!'));
    cout << "Insertion to str1: " << str6.getChar(0) << str6.getChar(1) << str6.getChar(2) << str6.getChar(3)
         << str6.getChar(4) << str6.getChar(5) << str6.getChar(6) << str6.getChar(7) << str6.getChar(8)
         << str6.getChar(9) << endl;

    // 删除
    FixedString str7 = str1.remove(2, 2);
    cout << "Deletion from str1: " << str7.getChar(0) << str7.getChar(1) << str7.getChar(2) << str7.getChar(3) << endl;

    // 替换
    FixedString str8 = str1.replace(FixedString(2).setChar(0, 'l').setChar(1, 'o'), FixedString(3).setChar(0, 'X').setChar(1, 'Y').setChar(2, 'Z'));
    cout << "Replacement in str1: " << str8.getChar(0) << str8.getChar(1) << str8.getChar(2) << str8.getChar(3)
         << str8.getChar(4) << str8.getChar(5) << str8.getChar(6) << str8.getChar(7) << endl;

    // 比较
    cout << "Comparison of str1 and str2: " << (str1.equals(str2) ? "Equal" : "Not equal") << endl;
    cout << "Comparison of str1 and str3: " << (str1.equals(str3) ? "Equal" : "Not equal") << endl;

    return 0;
}

这个程序实现了定长顺序串的复制、长度、连接、子串、定位、插入、删除、替换和比较等操作。你可以根据需要调用其中的函数来进行操作。