C :

#include <stdio.h>
#include <stdlib.h>
int main()
{
    printf("  *\n");
    printf(" ***\n");
    printf("*****\n");
    printf(" ***\n");
    printf("  *\n");
    // system("pause");
    return 0;
}

C++ :

#include<bits/stdc++.h>
using namespace std;
int n;
int main()
{
	cout<<"  *"<<endl;
	cout<<" ***"<<endl;
	cout<<"*****"<<endl;
	cout<<" ***"<<endl;
	cout<<"  *";
	return 0;
}