C :

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

C++ :

#include <iostream> 
  
int main() 
{ 
    using namespace std; 
    char star = '*'; 
    int height, weight; 
  
    while (cin >> height){ 
        weight = (2 * height - 1) / 2; 
        for (int i = 1; i <= height; i++){ 
            for (int j = 1; j <= weight; j++) 
                cout << " "; 
            for (int j = 1; j <= 2*i-1; j++) 
                cout << star; 
            cout << endl; 
            weight--; 
        } 
    } 
  
}