C :

#include <stdio.h>
int main()
{
    int n,i,j;
    scanf("%d",&n);

    for(i=1;i<=n;i++)
    {
        if(i==1)
        {
            for(j=1;j<=n-1;j++)
                putchar(' ');
            for(j=1;j<=n;j++)
                putchar('*');
        }
        else if(i!=1)
        {
            for(j=1;j<=n-i;j++)
                putchar(' ');
            putchar('*');
            for(j=1;j<=n+i*2-4;j++)
                putchar(' ');
            putchar('*');
        }
        /*
    *****               n=5      n=7     i
   *     *5 7                            2
  *       *7 9                           3
 *         *9 11                         4
*           *11 13                       5
 *         *9
  *       *7
   *     *5
    *****
*/
        putchar('\n');
    }
    for(i=1;i<=n-1;i++)
    {
        if(i!=n-1)
        {
            for(j=1;j<=i;j++)
                putchar(' ');
            putchar('*');
            for(j=1;j<=3*n-2*i-4;j++)
                putchar(' ');
            putchar('*');
        }
        else
        {
            for(j=1;j<=n-1;j++)
                putchar(' ');
            for(j=1;j<=n;j++)
                putchar('*');
        }
        putchar('\n');
    }
    return 0;
}
/*
    *****
   *     *5
  *       *7
 *         *9
*           *11
 *         *9      n=5
  *       *7
   *     *5
    *****
*/

C++ :

#include <iostream>
#include <iomanip>
using namespace std;

int main(){
	int i,j,n;
	cin>>n;
	for(i=1;i<=n;i++){
		for(j=1;j<=n-i;j++){
			cout<<" ";
		}
		for(j=1;j<=n+(i-1)*2;j++){
			if(i!=1){
				if(j>1&&j<n+(i-1)*2){
					cout<<" ";
				}else{
					cout<<"*";
				}
			}else{
			cout<<"*";
		}
		}
		cout<<endl;
	}
	for(i=n;i>=1;i--){
		if(i!=n){
		for(j=1;j<=n-i;j++){
			cout<<" ";
		}
		for(j=1;j<=n+(i-1)*2;j++){
			if(i!=1){
				if(j>1&&j<n+(i-1)*2){
					cout<<" ";
				}else{
					cout<<"*";
				}
			}else{
			cout<<"*";
		}
		}
		cout<<endl;
	}
	}
	
}

Pascal :

var i,j,k,n:integer;
begin
   readln(n);
   for i := 1 to n do
   begin
     for j := 1 to n - i do
        write(' ');
      
     write('*');
      
     if i = 1 then
       for j := 1 to n - 2 do write('*')
     else
       for j := 1 to 2 * (i - 1)  + n - 2 do
          write(' ');
      
     write('*');
      
      
        
     writeln;
   end;
    
   for i := n - 1 downto 1 do
   begin
     for j := 1 to n - i do
        write(' ');
      
     write('*');
      
     if i = 1 then
       for j := 1 to n - 2 do write('*')
     else
       for j := 1 to 2 * (i - 1)  + n - 2 do
          write(' ');
      
     write('*');
      
      
        
     writeln;
   end;
end.

Java :

import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		for(int i = 1 ; i <= n-1;i++) {
			System.out.print(" ");
		}
		for(int i = 1 ; i <= n;i++) {
			System.out.print("*");
		}
		System.out.println();
		for(int i = 1 ; i <= n-1;i++) {//4行
			for(int j = 1 ; j <= n - 1 -i;j++) {
				System.out.print(" ");
			}
			System.out.print("*");
			for(int j = 1 ; j <= 2*i+n-2;j++) {
				System.out.print(" ");
			}
			System.out.print("*");
			System.out.println();
		}
		
		for(int i = 1 ; i <= n-2;i++) {
			for(int j = 1 ; j <= i;j++) {
				System.out.print(" ");
			}
			System.out.print("*");
			
			for(int j = 1 ; j <=3*n-2*i-4;j++) {
				System.out.print(" ");
			}
			System.out.print("*");
			System.out.println();
		}
		for(int i = 1 ; i <= n-1;i++) {
			System.out.print(" ");
		}
		for(int i = 1 ; i <= n;i++) {
			System.out.print("*");
		}
		
	}
}