C :

#include<stdio.h>
void Print( int N )
{
	int i;
	for( i = 0; i < N; ++i )
		putchar( '*' );
	putchar( '\n' );
	return;	
}
int main( int argc, char **argv )
{
	int i;
	for( i = 4; i > 0; --i )
		Print( i );
	return 0;
		
}

C++ :

#include <iostream>
using namespace std;
int main( )
{
   cout<<"****"<<endl;
   cout<<"***"<<endl;
   cout<<"**"<<endl;
   cout<<"*"<<endl;
  return 0;
}

Java :

public class Main {
	public static void main(String[] args) {
		int m=4;
		for(int i=1;i<=4;i++){
			for(int j=1;j<=m;j++){
				System.out.print("*");
			}
			m--;
			System.out.println();
		}
	}
}