在C中，如何在一个函数中，在一个不同的函数中评估一个局部变量？

Question

好的，所以我正在制作这个文字冒险游戏。为了完全独特和不同，我决定添加一个影响系统，你对其他角色的反应会影响他们对你的反应以及他们的战斗力。 我在C ++方面有相当多的经验，我刚刚在C开始了我的第二个学期的课程。到目前为止，我尝试过使用全局变量，结构，静态变量以及在其他函数中使用函数。我也尝试过使用指针，但每次都不断出错，所以我就停止了。这是一段试图使用影响系统的代码（对不起星星，不想泄露任何故事情节）：

#include <stdlib.h>
#include <stdio.h>
static int positive_Influence; int negative_Influence; int overall_Influence;

void printpInI(int positive_Influence, int negative_Influence);//positive and negative influence

int choice_6()
{
    int choice = 0;
    int positive_Influence, negative_Influence, overall_Influence;

    positive_Influence = 0;
    negative_Influence = 0;
    overall_Influence = 0;

    printf("What do you do?\n");
    printf("\t1. You: ****\n");
    printf("\t2. You: ****\n");
    printf("\t3. You: ****\n");
    do 
    {
        scanf_s("%i", &choice);
        switch (choice)
        {
            case 1:
                {
                    printf("\t****?\n");
                    system("pause");
                    negative_Influence += 10;
                    printf("You lose influence and are now at %i with ****.\n", positive_Influence-negative_Influence);
                    break;
                }
            case 2:
                {
                    printf("\t****");
                    system("pause");
                    positive_Influence += 10;
                    printf("You gain influence and are now at %i influence with ****.\n", positive_Influence-negative_Influence);
                    break;
                }
            case 3:
                {
                    printf("**** smiles at this.\n");
                    system("pause");
                    positive_Influence += 10;
                    printf("You gain influence and are now at %i influence with ****.\n", positive_Influence-negative_Influence);
                    break;
                }
        }
    }while(choice != 1 && choice != 2 && choice != 3);
    overall_Influence = positive_Influence-negative_Influence;
    printf("%i\n", overall_Influence);
}

void story_7()
{
    printf("Your overall influence is %i\n", overall_Influence);
}
int main()
{
    choice_6();
    story_7();
    system("pause");
}

Answer 1

您已将overall_influence声明为全局，但在choice_6中声明为本地。本地宣言优先;只是删除它，你应该没问题。变量positive_influence和negative_influence也是如此。

Answer 2

你能告诉我你遇到了哪种类型的错误？你也已经声明了用于计算影响的全局变量，所以为什么你再次在choice_6函数中本地声明它，这是你程序中的错误情况，所以局部变量比它们声明的函数中的全局变量更优先。因此，从函数choice_6中删除声明。

Answer 3

我实际上只是真的很愚蠢，因为我忘记了指针的工作原因（大坝＆符号！）无论如何谢谢大家的回复我真的非常感激。我也在制作一个可以使用多个敌人的战斗系统，所以继续关注我的个人资料，因为我以后可能会有一些问题。如果你想进行beta测试，我的电子邮件是mikemanahan15@gmail.com，如果你想玩我到目前为止所做的。当然，这里是完成的代码（对于choice_6和story_7）享受：

#include <stdlib.h>
#include <stdio.h>


int choice_6(int *influence)
{
int choice = 0;
    printf("What do you do?\n");
    printf("\t1. You: No. I know absolutely nothing about you. You could be a monster\n");
    printf("\ttoo for all I know! Normal people don't turn into frogs!\n");
    printf("\t2. You: Your right we should keep moving. You can tell me when your\n");
    printf("\tready.\n");
    printf("\t3. You: Okay where do you think should we go then?\n");
    do 
    {
        scanf_s("%i", &choice);
        switch (choice)
        {
            case 1:
                {
                    printf("\tBrie flashes a pained look on her face and you immediately regret saying that.\n");
                    printf("\tBrie: You really think I'm a monster?\n");
                    system("pause");
                    *influence -= 10;
                    printf("You lose influence and are now at %i with Brie.\n", *influence);
                    system("pause");
                    printf("Influence affects characters reactions towards you, their combat effectiveness, and even their allegiances in rare cases.\n");
                    printf("However, depending on the situation, low influence is not always a bad thing...\n");
                    system("pause");
                    printf("\tYou: Your right we should keep moving.\n");
                    break;
                }
            case 2:
                {
                    printf("\tBrie: Thank you. I'd rather not discuss this my life story in a dark\n");
                    printf("\tdungeon.\n");
                    system("pause");
                    *influence += 10;
                    printf("You gain influence and are now at %i influence with Brie.\n", *influence);
                    system("pause");
                    printf("Influence affects characters reactions towards you, their combat effectiveness, and even their allegiances in rare cases.\n");
                    printf("However, depending on the situation, low influence is not always a bad thing...\n");
                    system("pause");
                    printf("\tYou: I'd have to agree with you there. Let's see what is up these stairs.\n");
                    choice = 2;
                    break;
                }
            case 3:
                {
                    printf("Brie smiles at this.\n");
                    printf("\tBrie: Well the only way out seems to be these stairs so let's go up.\n");
                    system("pause");
                    *influence += 10;
                    printf("You gain influence and are now at %i influence with Brie.\n", *influence);
                    system("pause");
                    printf("Influence affects characters reactions towards you, their effectiveness in combat, and even their allegiances in rare cases.\n");
                    printf("However, depending on the situation, low influence is not always a bad thing...\n");
                    system("pause");
                    printf("\tYou: Sounds good to me I am quite frankly done with dungeons about now.\n");
                    break;
                }
            default:
                {
                    printf("Type the number for the choice you want to do\n");
                    system("pause");
                    break;
                }
        }
    }while(choice != 1 && choice != 2 && choice != 3);
}

int story_7(int influence)
{
    if (influence > 0)
    {
    printf("Brie laughs at this and slowly leans you off her to have both of you crouch.");
    system("pause");
    }
    else
    {
        printf("Brie: Ugh just get off of me!\n");
        printf("Brie pushes you off her violently and you manage to stay crouched.");
        system("pause");
    }
}

int main()
{
    int influence = 0;
    // ...
    choice_6(&influence);
    story_7(influence);
    // ...
}

Answer 4

您应该删除局部变量并使用范围解析运算符来使用全局变量 这可以解决你的问题。

您也可以在以后想要的任何功能中使用这些变量。