如何更改函数中的字符串数组

我在更改字符串数组的值时遇到问题。代码的重点是检查它是什么故事编号，然后更改字符串数组的值，然后通过forloop在choices函数中打印出来。

void CheckDecisions(std::string choices[], int num_choices, int story_number)
{
    //choices = new std::string[];
    const int num = 4;
    num_choices = num;
    if (story_number == 0)
    {
        std::string start_choices[num] = { "", "Home", "The Store", "Your friend Taylor's place" };
        choices = start_choices;
    }
    if (story_number == 1)
    {
        //std::string_choices[num_choices] = { "", "Hummana", "Hummana", "Yes!" };
    }
}

它不会更改字符串的值，并且仍然返回空值。正确的语法是什么？

这是整个代码：

#include <iostream>
#include <string>
#include <vector>

void CheckStoryArk(int choice, std::string story, int story_number)
{
    if (story_number == 0)
    {
        if (story == "Home")
        {
            printf("story is Homen");
        }
        if (story == "The Store")
        {
            printf("Story is Storen");
        }
        if (story == "Your friend Taylor's place")
        {
            printf("Story is Taylorn");
        }
    }

    if (story_number == 1)
    {
        if (story == "whatever")
        {
            printf("something");
        }
    }

    if (story_number == 2)
    {
        printf("story number is 3n");
    }
    if (story_number == 3)
    {
        printf("story number is the endn");
    }
}

void CheckDecisions(std::string choices[], int num_choices, int story_number)
{
    //choices = new std::string[];
    const int num = 4;
    num_choices = num;
    if (story_number == 0)
    {
        std::string start_choices[num] = { "", "Home", "The Store", "Your friend Taylor's place" };
        choices = start_choices;
    }
    if (story_number == 1)
    {
        //std::string_choices[num_choices] = { "", "Hummana", "Hummana", "Yes!"      };
    }
}


//Prints out choices
void Choices(int num_choices, std::string choices[], int choice, std::string story, int story_number)
{
    CheckDecisions(choices, num_choices, story_number);
    for (int i = 1; i < num_choices; i++)
    {
        //printf("%d %sn", i, choices[i]);
        std::cout << i << " " << choices[i] << "n";
    }
    std::cin >> choice;
    if(choice >= num_choices)
    {
        printf("That's not a valid answer, dickbag!n");
        std::cin >> choice;
    }
    story = choices[choice];
    CheckStoryArk(choice, story, story_number);
}

void Story(int story_number, const int num_choices, std::string choices[], int choice)
{
    printf("You're driving down the streets of Los Angeles, where are you going?n");
    for (int i = 0; i < story_number; i++)
    {
        Choices(num_choices, choices, choice, choices[choice], i);      
    }
}
void main()
{
    const int num_choices = 4;
    int story_number = 4;
    int choice = 0;
    std::string choices[num_choices] = {};
    Story(story_number, num_choices, choices, choice);
}