C++ | 函数 |实验四

1.闰年的判定

#include<iostream>
using namespace std;
bool IsLeapYear(int y);
int main()
{
	int y;
	cout << "输入年份";
	cin >> y;
	IsLeapYear(y);     //定义中有cout操作符,main函数就无需赘述
	system("pause");
	return 0;
}

bool IsLeapYear(int y)
{
	if (y % 400 == 0 || (y % 100 != 0 || y % 4 == 0))      //可以内嵌括号改变优先级
		cout << "你输入的是闰年";
	else
		cout << "不是闰年";
	return y;
}

2.根据三边长求三角形面积

#include<iostream>
using namespace std;
#include <cmath>
double S(double a, double b, double c);
int main()
{
	double a, b, c;
	
	cin >> a >> b >> c;
	cout<<S(a, b, c);
	system("pause");
	return 0;
}
double S(double a, double b, double c)
{
	double p = (a + b + c) / 2;
	double S = pow(p*(p - a)*(p - b)*(p - c), 0.5);
	if (a + b < c || a + c < b || b + c < a)
		cout << "无法构成三角形";
	return S;
}

3.华摄氏度转换

#include<iostream>
using namespace std;
float wendu(float F);
int main()
{
	float C, F;
	cout << "输入华氏温度";
	cin >> F;
	cout<<wendu(F);
	system("pause");
	return 0;
}
float wendu(float F)
{
	float C = (F - 32) * 5 / 9;
	return C;
}