习题 5.4 有一个已排好序的数组，今输入一个数，要求按原来排序的规律将它插入数组中。

代码：

#include <iostream>
#include<iomanip>
using namespace std;

int main()
{
    int a[6] = { 1,9,13,40,100 };
    int num, i, j;

    cout << "原数组：" << endl;

    for (i = 0; i < 5; i++)
        cout <<setw(4)<< a[i] ;

    cout << endl;
    cout << "请输入插入值：";
    cin >> num;

    if (num > a[4])
        a[5] = num;
    else
    {
        for (i = 0; i < 5; i++)
        {
            if (a[i] > num)
            {
                for (j = 4; j >= i; j--)
                    a[j + 1] = a[j];
                a[i] = num;
                break;
            }
        }
    }
    
    cout << "新数组为：" << endl;
    for (i = 0; i < 6; i++)
        cout << a[i] << " ";

    cout << endl;

    return 0;
}