C++入门级小算法

反序输出一个整数

#include <iostream>

using namespace std;

int main()
{
	int n;
	while (cin >> n)//输入一个整数
	{
		int temp = 0;//temp作为存储的值
		while (n != 0){
			temp = temp * 10 + n % 10;
			n /= 10;
		}  //反序取出来
		cout << temp << endl; //打印
	}
	system("pause");
	return 0;
}

运行结果：

选择排序

#include <iostream>

using namespace std;

void selectSort(int a[], int len)
{
	int i, j, k, tem;
	for (i = 0; i < len - 1; i++)
	{
		k = i;
		for (j = k + 1; j < len; j++)
		{
			if (a[k] > a[j])
			{
				k = j;
			}
		}
		if (i != k)
		{
			tem = a[i];
			a[i] = a[k];
			a[k] = tem;
		}
	}
}

int main()
{
	int array[] = { 34, 65, 12, 43, 67, 5, 78, 10, 3, 70 }, k;
	int len = sizeof(array) / sizeof(int);
	cout << "The orginal array are:" << endl;
	for (k = 0; k < len; k++)
		cout << array[k] << ",";
	cout << endl;
	selectSort(array, len);
	cout << "The sorted array are:" << endl;
	for (k = 0; k < len; k++)
		cout << array[k] << ",";
	cout << endl;
	system("pause");
	return 0;
}