我将如何仅使用if else语句（no for，do / while等）使此代码循环一定次数？ （C ++）

Question

Today we have assignment on making random number game. teacher tells tells us we only can use what we learn so far. we did not learn any loop, so i'm stuck using only if/else. how do i use only if/else statement to make random number game loop 8 time and at end of 8 turn it show answer?

i start this code but clueless on how to continue.

int main(){
   int Guess;
   cout << "Guess my number!\n\n";
   cout << "Enter a number between 1 and 100. \n";
   cin >> Guess;

   unsigned Number = time(0);
   const int Min = 1, Max = 100;
   srand(Number);
   Number = (rand() % (Max - Min + 1)) + Min;
   int tries = 8;

   if (Guess < Number && tries > 0){
      tries -= 1;
      cout << "guess is lower than the number! try again. tries:" << tries << endl;
      cin >> Number;
   }
   else if (Guess > Number&& tries>0){
      tries -= 1;
      cout << "guess is higher than the number! try again. tries:" << tries << endl;
      cin >> Number;
   }
   else{
      cout << "your answer is right the number is:" << Number << endl;
   }

   if (tries == 0){ 

      cout << "number is: " << Number << endl; 
      system("pause");
      return 0;
   }
   system("pause");
   return 0;

}

Answer 1

如果/线性非常线性，我不认为您真的可以回到使用它们的开始，也许您的老师表示您可能必须重复相同的行8次，这似乎有点多，但是如果您将代码更简单，这可能很简单，您是否必须告诉玩家他们的猜想是更大还是更小，也许您可​​以给他们8次尝试，让他们猜测1到20之间的数字，我认为没有while / for循环这样做不是一个好习惯，如果您仅使用循环，它将使一切变得更简单。

Answer 2

I don't think there's any way to loop back using an if-else block. I'm guessing your teacher is giving you this exercise so that you can appreciate loops. Anyway, here's a somewhat neat solution using switch case.

int main() {
    int Guess;
    cout << "Guess my number!\n\n";
    cout << "Enter a number between 1 and 100. \n";
    cin >> Guess;

    unsigned Number = time(0);
    const int Min = 1, Max = 100;
    srand(Number);
    Number = (rand() % (Max - Min + 1)) + Min;
    int tries = 8;

    switch (tries) {
        case 8:
            if (Guess == Number) {
                cout << "your answer is right the number is:" << Number << endl;
                break;
            } else if (Guess < Number) {
                cout << "guess is lower than the number! try again. tries:" << tries << endl;
            } else {
                cout << "guess is higher than the number! try again. tries:" << tries << endl;
            }
            cin >> Guess;
            tries--;
        case 7:
            if (Guess == Number) {
                cout << "your answer is right the number is:" << Number << endl;
                break;
            } else if (Guess < Number) {
                cout << "guess is lower than the number! try again. tries:" << tries << endl;
            } else {
                cout << "guess is higher than the number! try again. tries:" << tries << endl;
            }
            cin >> Guess;
            tries--;
            // repeat code
        case 1:
            if (Guess == Number) {
                cout << "your answer is right the number is:" << Number << endl;
                break;
            } else if (Guess < Number) {
                cout << "guess is lower than the number! try again. tries:" << tries << endl;
            } else {
                cout << "guess is higher than the number! try again. tries:" << tries << endl;
            }
            cin >> Guess;
            tries--;
        default:
            if (Guess == Number) {
                cout << "your answer is right the number is:" << Number << endl;
            } else {
                cout << "number is: " << Number << endl;
            }
    }
    system("pause");
    return 0;
}

Answer 3

Since I don't really know what you covered in class, I'll just make a list of the options. There are many kinds of "loops":

• goto loops, using labels.
• for loops
• while loops
• do {} until loops
• Unrolled loops ( aka. Copy-Paste)
• Recursion
  • You can also use recursion by calling your executable from within the executable
  • You could try calling main() from inside main() and use arguments, or a global or static variable as counter.

Keep in mind there's also the chance that there was something quickly covered in class which you missed, and which isn't in chapters 1-4. You said: Covered in class or in the book.