Question

我很难掌握变量范围的概念。什么是可以接受的，什么是不可接受的？我知道我已经遗漏了所有与图形相关的代码，我知道我有一个无限的游戏循环，但请耐心等待：

#include "LList.h"
#include "Snake.h"
#undef main



int main()
{

float dt;               // time since last update.
int start_time;
bool paused = false;
float originalTime = 1.0f;
float timer = originalTime;
Snake p1Snake(10, false);



    // Start the 'stopwatch'
    start_time = SDL_GetTicks();

    ///////////////////////
    // The 'game loop'   //
    ///////////////////////
    while (!done)
    {
        //////////////////////
        // Update variables //
        //////////////////////
        // Update the dt value (to be the time since the last update)
        dt = (SDL_GetTicks() - start_time) / 1000.0f;
        start_time = SDL_GetTicks();

            //increment the movement timer
        timer-=dt;
        if(timer<=0) When timer hits zero the snake is moved north.
            {
                p1Snake.goNorth();
                timer = originalTimer; //reset timer.
            }
    }

    return 0;
}

好！所以我的问题是变量'originalTimer'。它超出了重置计时器的范围，所以我能做些什么呢？对不起，如果这是一个非常基本的问题。

Answer 1

你使用了不同的名字。 originalTime和originalTimer

#include "LList.h"
#include "Snake.h"
#undef main



int main()
{

    float dt;               // time since last update.
    int start_time;
    bool paused = false;
    float originalTimer = 1.0f;  //Changed to originalTimer
    float timer = originalTimer; //Changed to originalTimer
    Snake p1Snake(10, false);

    // Start the 'stopwatch'
    start_time = SDL_GetTicks();

    ///////////////////////
    // The 'game loop'   //
    ///////////////////////
    while (!done)
    {
        //////////////////////
        // Update variables //
        //////////////////////
        // Update the dt value (to be the time since the last update)
        dt = (SDL_GetTicks() - start_time) / 1000.0f;
        start_time = SDL_GetTicks();

        //increment the movement timer
        timer-=dt;
        if(timer<=0) //When timer hits zero the snake is moved north.
        {
            p1Snake.goNorth();
            timer = originalTimer; //reset timer.
        }
    }

    return 0;
}

Answer 2

可能是拼写错误，但有两个不同的变量originalTime和originalTimer

更改下面的代码应该对你有用..

timer = originalTime; //reset timer.

关于变量范围的问题

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