c++ - 定时 C++ 程序问题

Question

我正在制作一个打字速度测试程序，它有一个循环需要运行 60 秒然后退出并显示结果。我读过其他关于为 C++ 程序计时的地方，但我的研究没有定论。该程序正在运行 (llbd)，我希望有人有解决方案/更好的方法来解决这个问题。此外，Xcode 是我目前唯一可用的软件。

#include <iostream>
#include <string>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>

using namespace std;

string words[100];
string answer;
int rand_word = 0;
int speed = 0;
int wrong = 0;
int loop = 0;
clock_t t1;

void void_word();

int main(){

    char pause;
    cout << "Typing Speed Test" << endl;
    cout << "Press any Key to Continue";
    cin >> pause;
    t1 = clock();
    {
       if((t1/CLOCKS_PER_SEC) == 60){
           loop = 1;
       }
       void_word();
       cout << words[rand_word];
       cin >> answer;
       if(answer == words[rand_word]){
           speed ++;
       }
       if(answer != words[rand_word]){
           wrong ++;
       }
       srand (time(NULL)); // don't understand why underlined?
    }while (loop == 1)

    cout << "Your typing speed was " << speed << "WPM - with " << wrong << " wrong words" << endl;
    return 0;
}
void void_word(){
    rand_word = rand() % 40 + 1; // will change to ~ 100

    words[1] = "the";
    words[2] = "be";
    words[3] = "and";
    words[4] = "woman";
    words[5] = "good";
    words[6] = "through";
    words[7] = "child";
    words[8] = "there";
    words[9] = "those";
    words[10] = "work";
    words[11] = "should";
    words[12] = "world";
    words[13] = "after";
    words[14] = "country";
    words[15] = "pattern";
    words[16] = "it";
    words[17] = "enough";
    words[18] = "read";
    words[19] = "sit";
    words[20] = "right";
    words[21] = "tail";
    words[22] = "deep";
    words[23] = "dark";
    words[24] = "first";
    words[25] = "self";
    words[26] = "their";
    words[27] = "free";
    words[28] = "hundred";
    words[29] = "group";
    words[30] = "car";
    words[31] = "did";
    words[32] = "self";
    words[33] = "best";
    words[34] = "snow";
    words[35] = "language";
    words[36] = "pound";
    words[37] = "early";
    words[38] = "call";
    words[39] = "boat";
    words[40] = "light";
    return;
}

Answer 1

不完全确定您的问题是什么，因此这里有一些提示可以帮助您解决问题。

您缺少 while 循环的 do - 实际循环的部分将是后一行的 cout。

您不应该在循环中调用 srand()。如果您的循环很快，那么 time() 将多次返回相同的值，这将导致 srand() 继续为随机数生成器播种相同的值，这反过来将使 rand() 继续返回相同的值。

您还应该检查时间是否为 > 60 而不是 ==，就好像用户输入单词的时间超过 1 秒，它可能会错过第 60 秒.

您也不需要每次循环都初始化单词列表，C 中的数组从零开始，而不是从一开始。

对所有事物都使用全局变量是不必要的，也不是好的做法，您应该在函数中尽可能使用它们的地方声明变量。