C :

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

}

C++ :

#include <iostream>
#include <cstring>

using namespace std;

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

Python :

n = int(input())
for i in range(n - int(n // 2), 0, -1):
    print("*" * i)
for j in range(2, n - int(n // 2 - 1)):
    print("*" * j)