Electronic Association C language level 1 34, piecewise function

Electronics Association C Language 1 level  34 、 Piecewise functions

OpenJudge - 13: Piecewise functions

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C＋＋ Code ：

/*
 Electronics Association  C Language  1 level   34 、 Piecewise functions  
http://noi.openjudge.cn/ch0104/13/

 Programming , Calculate the following piecewise functions  y=f(x) Value .
y=-x+2.5; 0 <= x < 5
y=2-1.5(x-3)(x-3); 5 <= x < 10
y=x/2-1.5; 10 <= x < 20
 Input 
 A floating point number  N,0 <= N < 20
 Output 
 Output  N  Corresponding piecewise function value ：f(N). Keep the result to three decimal places .
 The sample input 
1.0
 Sample output 
1.500
*/
#include<iostream>
using namespace std;
int main()
{
	double n,y;
	cin>>n;
	
	if(n>=0 && n<5)
	{
	    y=-n+2.5;
	}
	else
	{
		if(n>=5 && n<10)
		{
		    y=2-1.5*(n-3)*(n-3);
		}
	
		if(n>=10 && n<20)
		{
		    y=n/2-1.5;
		}
	}
    
	printf("%.3lf\n",y);
	
	return 0;
}

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python3 Code ：

n = float(input())

if 0 <= n < 5:
    print('%.3f' % (2.5 - n))
elif n < 10:
    print('%.3f' % (2 - 1.5*(n - 3)*(n - 3)))
elif n < 20:
    print('%.3f' % (n/2 - 1.5))

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