---
# System prepended metadata

title: C++(2)

---

# C++(2)
## 比大小-1
![](https://i.imgur.com/iL03AY3.png)

```cpp=
#include<iostream>

using namespace std;

int main()
{
	//123456
	 
    int a,b;

    cin>>a>>b;

    if (a>b)
    {
		cout<<"a>b"<<endl;
    }
    
	else if (a==b)
	{
		cout<<"a=b"<<endl;
	}
	else
	{
		cout<<"a<b"<<endl;
	}
    return 0;
}
```
## 比大小-2
```cpp=
#include<iostream>

using namespace std;

int main()
{
	 
    int a,b;

    cin>>a>>b;

    if (a>b)
    {
		cout<<a<<">"<<b<<endl;
    }
    
	else if (a==b)
	{
		cout<<a<<"="<<b<<endl;
	}
	else
	{
		cout<<a<<"<"<<b<<endl;
	}
    return 0;
}
```
## 成績
![](https://i.imgur.com/NbUcPCj.png)


```cpp=
#include <iostream>
using namespace std;
int main () 
{
	int score;
	cout<<"請輸入一個成績?";
    cin>>score;
    if (score>=80){
    	cout<<"非常好"<<endl;
		 }
	else if (score>=60){
		cout<<"不錯喔"<<endl;
		 }
	else
	{cout<<"要加油"<<endl;}
}
```
## BMI
![](https://i.imgur.com/QAv8Rdr.png)

```cpp=
#include <iostream>
using namespace std;
int main ()
{
   double weight,height,BMI;
   cout<<"請輸入體重(kg)?";
   cin>>weight;
   cout<<"請輸入身高(cm)?";
   cin>>height;
   height=height/100;
   BMI=weight/(height*height);
   cout<<"BMI為"<<BMI<<endl;
   if (BMI<18) 
      {cout<<"體重過輕"<<endl;
	   }
   else if(BMI<24)
      {cout<<"體重正常"<<endl;
	   }	  
   else if (BMI<27)  
      {cout<<"體重過重"<<endl;
	   } 
   else {cout<<"體重肥胖"<<endl;
   }
}
```