如何在 1 和用户输入的数字之间生成随机数？

Question

How do I create a program that generates ten random numbers from 1 -> RAND_MAX ?

RAND_MAX must be a number input by the user.

#include <iostream>
#include <stdlib.h>

int main()
{
    using namespace std;
    int x;
    int y;


    Random:
    {
        x = rand();
        cout << x << endl;
    }

    y = y + 1;
    if (y == 10) {
        return 0;
    }

    goto Random;
}

Answer 1

Disclaimer: rand is a quick and dirty way to generate random numbers, as it may not generate numbers perfectly uniformly and you'll run into some issues if RAND_MAX (the upper limit for rand ) is defined to be smaller than your target range. In modern C++ it would be better to use the <random> header, as per the question Generate random numbers uniformly over an entire range .

---

Something like:

int main()
{
  int randMax;
  cin >> randMax;
  for (int y = 0; y < 10; y++)
  {
    int x = rand() % randMax; // Range = [0, randMax)
    cout << x+1 << endl; // Range = [1, randMax]
  }
}

Oh, and do try to avoid goto (at least in my opinion). Here are two questions about it.