C ++程序生成N个密码，每个密码的长度为M
这是一个C++程序，用于生成N个密码，每个密码的长度为M。
算法
Begin
Take the length of password as input.
function permutation() generate random passwords:
/* Arguments
A pointer array a.
Total Number of random numbers m.
Length of the password s.
*/
//函数主体：
if (m == s)
for i = 0 to s-1
Print *(a + i)
else
for i = m to s-1
int tmp = a[m]
a[m] = a[i]
a[i] = tmp
Call permutation(a, m + 1, s)
tmp = a[m]
a[m] = a[i]
a[i] = tmp
End示例
#include<iostream>
#include<conio.h>
#include<stdlib.h>
using namespace std;
void permutation(int *a, int m, int s) {
if (m == s) {
for (int i = 0; i < s; i++) {
cout << *(a + i);
}
cout << endl;
} else {
for (int i = m; i < s; i++) {
int tmp = a[m];
a[m] = a[i];
a[i] = tmp;
permutation(a, m + 1, s);
tmp = a[m];
a[m] = a[i];
a[i] = tmp;
}
}
}
int main(int argc, char **argv) {
cout << "Enter the length of the password: ";
int n;
cin >> n;
int a[n];
for (int i = 0; i < n; i++) {
a[i] = rand() % 10; //randomly generate numbers
}
cout <<"随机数是：" <<endl;
for (int i = 0; i < n; i++) {
cout<<a[i] <<endl;
}
cout << "The Passwords are: "<<endl;
permutation(a, 0, n);
}输出结果
Enter the length of the password: 4 随机数是： 1740T he Passwords are: 1740 1704 1470 1407 1047 1074 7140 7104 7410 7401 7041 7014 4710 4701 4170 4107 4017 4071 0741 0714 0471 0417 0147 0174