[C++知识库]C++题目

#include<iostream>
using namespace std;

void paixu(int arr[], int len)
{

	for (int i = 0; i < len; i++)
	{
		int min = arr[i];
		for (int j = i+1; j < len; j++)
		{
			if (arr[i] > arr[j])
			{
				int temp = arr[j];
				arr[j] = arr[i];
				arr[i] = temp;
			}
		}
	}
	for (int i = 0; i < len; i++)
	{
		cout << arr[i] << " ";
	}cout << endl;
}

void binary(int a)
{
	int arr[10] = {0}, i = 0;
	while (a >= 2)
	{
		int b = a % 2;
		a = a / 2;
		arr[i] = b;
		i++;
	}
	arr[i] = a;
	for (int j = i; j >= 0; j--)
	{
		cout << arr[j];
	}cout << endl;
}

int sushu(int n)
{
	int i, sum = 0;
	for (i = 2; i <= n - 1; i++)
	{
		if (n % i == 0)
		{
			sum = sum + 1;
		}
	}
	if (sum == 0)
	{
		cout << "该数是素数。" << endl;
	}
	else
	{
		cout << "该数不是素数。" << endl;
	}
	return 0;
}

int main()
{
	int arr[] = { 20,56,45,892,156,458,623,874,6315 };
	int l = sizeof(arr)/4;
	int b = 14;
	//binary(b);
	//paixu(arr,l);
	sushu(9);
	system("pause");
	return 0;
}