C :

#include <stdio.h>
void main ()
{
	int n;
	scanf("%d",&n);
	int i;
	for ( i = 1; i<=n; i++ )
	{
		if(i<=n-1)
		{
			int k;
			for(k=1; k<=n-i; k++)
			{
				printf(" ");
			}
			printf("*");
			int j;
			for(j=1; j<=2*i-3; j++)
			{
				printf(" ");
			}
					if(	i-1!=0	)
			{
				printf("*");
			}
				printf("\n");
			
		}
		if(i==n)
			{
				int x;
				for( x=1; x<=2*n-1; x++ )
				{
					printf("*");
				}
			}
	}
	
	
	
	
	
	


}

C++ :

#include <iostream>
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 <= 2 * i - 1;j++){
			if(i == 1){
				cout<<"*";
			}else if(i == n){
				cout<<"*";	
			}else{
				if(j != 1 && j != 2 * i - 1){
					cout<<" ";
				}else{
					cout<<"*";
				}
			}
			
		}
		
		cout<<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();
		for(int i = 1 ; i <= n-1;i++) {
			for(int j = n-i ; j > 0;j--) {
				System.out.print(" ");
			}
			System.out.print("*");
			for(int j = 1 ; j <= 2*i-3;j++) {
				System.out.print(" ");
			}
			if(i>1) {
				System.out.print("*");
				}
			
			System.out.println();
		}
		for(int j = 1 ; j <= 2 * n - 1; j++) {
			System.out.print("*");
		}
		
	}
}	

Python :

n = int(input())
i = 1
while i <= n:
    j = 1
    while j <= n - i:
        print(" ",end="")    
        j += 1
    k = 1
    while k <= 2*i-1:
        if k == 1 or k == 2*i-1 or i == n:   
            print("*",end="")
        else:
            print(" ",end="")     
        k += 1
    print("")
    i += 1