C :

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

C++ :

#include<bits/stdc++.h>
using namespace std;
long long n;
int main()
{
	cin>>n;
    for(int i=1,j=n-1,k=1;i<=n;i++,j--,k+=2)
    {
    	for(int o=1;o<=j;o++)
    	cout<<' ';
    	for(int o=1;o<=k;o++)
    	cout<<'*';
    	cout<<endl;
	 } 
    return 0;
}

Pascal :

var n,i,j:longint;
begin
  readln(n);
  for i:=1 to n do
      begin
        write('':n-i);
        for j:=1 to i*2-1 do write('*');
        writeln;
      end;
end.