C :

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

C++ :

#include<bits/stdc++.h>
using namespace std;
int main(){
	int i,j,n;
	cin>>n;
	for(i=1;i<=n;i++){
		for(j=n;j>=i;j--){
			cout<<"*";
		}
		cout<<endl;
	}
	return 0;
} 

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 i,j;
		for(i=1;i<=n;i++) {
			for(j=1;j<=n+1-i;j++) {
				System.out.print("*");
			}
			System.out.println();
		}
	}

}

Python :

n = int(input())
for i in range(1, n + 1):
    for j in range(n - i + 1, 0, -1):
        print('*', end='')
    print()