C :

#include <stdio.h>
#include <stdlib.h>
int main()
{
    int a,i=0,s[100],u,j,t;
    double x,y,n;
    scanf("%d",&a);
    for(i=0;i<a;i++)
    {
        scanf("%d",&s[i]);
    }
    if(a%2==0)
    {
        for(i=0;i<a-1;i++)
        {
            for(j=i+1;j<a;j++)
            {
                if(s[i]>s[j])
                {
                    t=s[i];
                    s[i]=s[j];
                    s[j]=t;
                }
            }
        }
        x=s[a/2-1];
        y=s[a/2];
        printf("%.1f",(x+y)/2);
    }
    else  if(a%2==1)
    {
        for(i=0;i<a-1;i++)
        {
            for(j=i+1;j<a;j++)
            {
                if(s[i]>s[j])
                {
                    t=s[i];
                    s[i]=s[j];
                    s[j]=t;
                }
            }
        }
        u=(a-1)/2;
        n=s[u];
        printf("%.1f",n);
    }
    return 0;
}

C++ :

#include <iostream>
#include <iomanip>

using namespace std;

int main(){
	int a[100],i,j,t,n ;
	double v;
	cin>>n;
	for(i = 0;i < n;i++){
		cin>>a[i];
	}
	
	
	for(i = 1;i < n;i++){
		for(j = 0;j < n - i;j++){
			if(a[j] > a[j + 1]){
				t = a[j];
				a[j] = a[j + 1];
				a[j + 1] = t;
			}
		} 
	}
	
	if(n % 2 == 0){
		v = (a[n / 2] + a[n / 2 - 1]) * 1.0 / 2;
	}else{
		v = a[n / 2];
	}
	
	cout<<fixed<<setprecision(1)<<v<<endl;
	

}

Java :

import java.util.Scanner;

public class Main {
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		int n=sc.nextInt();
		int[] a=new int[n];
		for(int i=0;i<n;i++){
			a[i]=sc.nextInt();
		}
		for(int i=0;i<n;i++){
			for(int j=1;j<n-i;j++){
				if(a[j-1]<a[j]){
					int t=a[j-1];
					a[j-1]=a[j];
					a[j]=t;
				}
			}
		}
		double mid=0.0;
		if(n%2==0){
			mid=(double)(a[n/2-1]+a[n/2])/2;
		}
		else{
			mid=a[n/2];
		}
		System.out.println(String.format("%.1f", mid));
	}
	
}

Python :

n = int(input())
s = input().split()
l = []
avg = 0
for v in s:
    l.append(int(v))
# 从小到大排序
l.sort()
# 如果个数是偶数,则中间数是中间两个数的平均数
if n % 2 == 0:
    avg = (l[n // 2 - 1] + l[n // 2]) / 2
#如果个数是奇数,则中间数就是最中间的那个数
else:
    avg = l[n // 2]
print('%.1f' % avg)