将二维Char[][]数组的特定范围复制到字符*或std::string

#include <iostream>
#include <string>

// 复制特定范围的二维字符数组到字符*
char* copyRangeToCharPtr(char** array, int startRow, int startCol, int endRow, int endCol) {
    int numRows = endRow - startRow + 1;
    int numCols = endCol - startCol + 1;

    char* result = new char[numRows * numCols + 1]; // +1 用于存储空字符('\0')
    int index = 0;

    for (int i = startRow; i <= endRow; i++) {
        for (int j = startCol; j <= endCol; j++) {
            result[index++] = array[i][j];
        }
    }

    result[index] = '\0'; // 添加空字符('\0')表示字符串的结束

    return result;
}

// 复制特定范围的二维字符数组到std::string
std::string copyRangeToString(char** array, int startRow, int startCol, int endRow, int endCol) {
    std::string result;

    for (int i = startRow; i <= endRow; i++) {
        for (int j = startCol; j <= endCol; j++) {
            result += array[i][j];
        }
    }

    return result;
}

int main() {
    // 示例二维字符数组
    char array[3][4] = {
        {'a', 'b', 'c', 'd'},
        {'e', 'f', 'g', 'h'},
        {'i', 'j', 'k', 'l'}
    };

    // 复制特定范围到字符*
    char* charPtrResult = copyRangeToCharPtr((char**)array, 0, 1, 1, 2);
    std::cout << "Char* Result: " << charPtrResult << std::endl;
    delete[] charPtrResult; // 释放内存

    // 复制特定范围到std::string
    std::string stringResult = copyRangeToString((char**)array, 1, 0, 2, 3);
    std::cout << "std::string Result: " << stringResult << std::endl;

    return 0;
}