C++ 程序使用平方中间法生成随机数
平方中间法是最简单的随机数生成方法之一。此方法将开始反复生成相同数字,或循环到序列中的前一个数字,并无限循环。对于一个 n 位随机数生成器,周期长度不会超过 n。如果中间 n 位都为零,生成器会一直输出零,虽然这些零的序列很容易检测到,但它们的出现过于频繁,以至于无法通过此方法进行实际使用。
Input − Enter the digit for random number:4 Output − The random numbers are: 6383, 14846, 8067, 51524, .........
算法
Begin
middleSquareNumber(number, digit)
Declare an array and assign next_number=0.
Square the number and assign it to a variable sqn.
Divide the digit by 2 and assign it to a variable t.
Divide sqn by a[t] and store it to sqn.
For i=0 to digit, do
next_number =next _number (sqn mod (a[t])) * (a[i]);
sqn = sqn / 10;
Done
Return the next number
End.代码示例
#include <iostream>
using namespace std;
int a[] = { 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000 };
int middleSquareNumber(int number, int digit) {
int sqn = number * number, next_number = 0;
int t = (digit / 2);
sqn = sqn / a[t];
for (int i = 0; i < digit; i++) {
next_number += (sqn % (a[t])) * (a[i]);
sqn = sqn / 10;
}
return next_number;
}
int main(int argc, char **argv) {
cout << "Enter the digit random numbers you want: ";
int n;
cin >> n;
int start = 1;
int end = 1;
start = a[n - 1];
end = a[n];
int number = ((rand()) % (end - start)) + start;
cout << "The random numbers are:\n" << number << ", ";
for (int i = 1; i < n; i++) {
number = middleSquareNumber(number, n);
cout << number << ", ";
}
cout << ".........";
}输出
Enter the digit random numbers you want: 4 The random numbers are: 6383, 14846, 8067, 51524, .........
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