在校大学生常见的C++编程

1.请输入一个整数，用if-else判断是奇数还是偶数、、

#include<iostream>
using namespace std;

int main()
{
	int a;
	cout << "请输入一个整数" << endl;
	cin >>a;
	if (a%2!=0)
	{
		cout << "这是一个奇数" << endl;
	}
	else
	{
		cout << "这是一个偶数" << endl;
	}


	system("pause");
	return 0;
}

2.输入三角形的三边，判断其组成三角形的情形：等腰、等边、直角、任意、不组成

#include<iostream>
using namespace std;

int main()
{

        int a, b, c;
       
        cin >> a >> b >> c;
        if (a + b > c && a + c > b && b + c > a)
        {
            if (a == b && b == c)
            {
                cout << "等边三角形" << endl;
               
            }
            if (a == b && a != c || b == c && b != a || a == c && a != b)
            {
                cout << "等腰三角形" << endl;
               
            }
            if (a * a + b * b == c * c || a * a + c * c == b * b || b * b + c * c == a * a)
            {
                cout << "直角三角形" << endl;
               
            }
            if ( (a != b != c) &&(a * a + b * b != c * c || a * a + c * c != b * b || b * b + c * c != a * a))
            {
                cout << "任意三角形" << endl;
            }

        }
        else
        {
            cout << "不能组成三角形" << endl;
        }

	system("pause");
	return 0;
}

3.求1-99的奇数和，用while语句。

#include<iostream>
using namespace std;

int main()
{
    int i, sum;
    i = 1;
    sum = 0;
    while (i <= 100)
    {
        if ((i % 2) == 1)
        {
            sum = sum + i;

        }
        i++;
    }
    cout << "奇数和为" << sum << endl;

      

	system("pause");
	return 0;
}

4.用户输入三个整数，将最大数与最小数输出。

#include<iostream>
using namespace std;

int main()
{
    int a, b, c, max, min;
    cout << "请输入三个整数：" << endl;
    cin >> a >> b >> c;

    if (a > b)
    {
        max = a; min = b;
    }
    else
    {
        max = b; min = a;
    }
    if (max < c)
        max = c;
    else
        if (min > c)
            min = c;
    cout << "最大数为：" <<max << endl;
    
    cout << "最小数为：" << min << endl;

      

	system("pause");
	return 0;
}

5.输入三个数，将从小到大进行排序

#include<iostream>
using namespace std;
#include<iomanip>
int main()
{
    int a, b, c, temp;
    cout << "请输入三个整数：" << endl;
    cin >> a >> b >> c;
    if (a < b)
    {
        temp = a;
        a = b;
        b = temp;
    }
    if (a < c)
    {
        temp = a;
        a = c;
        c = temp;
    }
    if (b < c)
    {
        temp = b;
        b = c;
        c = temp;
    }
    
    cout << "从小到大排序： " << a  << setw(2) << b<< setw(2) << c << endl;

      

	system("pause");
	return 0;
}