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45 lines
1.4 KiB
C++
45 lines
1.4 KiB
C++
/*This is a C++ Program to generate random numbers using Middle Square method. In mathematics, the middle-square method is a method of generating pseudorandom numbers. In practice it is not a good method, since its period is usually very short and it has some severe weaknesses, such as the output sequence almost always converging to zero.*/
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#include <iostream>
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#include <math.h>
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#include <stdlib.h>
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using namespace std;
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int a[] = { 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000 };
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int middleSquareNumber(int numb, int dig)
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{
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int sqn = numb * numb, next_num = 0;
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int trim = (dig / 2);
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sqn = sqn / a[trim];
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for (int i = 0; i < dig; i++)
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{
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next_num += (sqn % (a[trim])) * (a[i]);
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sqn = sqn / 10;
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}
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return next_num;
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}
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int main(int argc, char **argv)
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{
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cout << "Enter the #-digit random numbers you want: ";
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int n;
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cin >> n;
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int start = 1, end = 1;
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start = a[n - 1];
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end = a[n];
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int number = ((rand()) % (end - start)) + start;
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cout << "The random numbers are:\n" << number << ", ";
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for (int i = 1; i < n; i++)
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{
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number = middleSquareNumber(number, n);
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cout << number << ", ";
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}
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cout << "...";
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}
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/*
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Enter the #-digit random numbers you want: 5
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The random numbers are:
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10041, 16426, 796264, -276041, -115546, ...
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