C
#include <stdio.h>
int main()
{
int n = 5, x = 1;
int i,j;
for(i = 1; i <= n; i++)
{
for (j = 1; j <= i; j++)
{
if (j == 1 || j == i || i == n)
{
printf("%2d ", x++);
}
else
{
printf(" "); // 3spaces
}
}
printf("\n");
}
return 0;
}
C++
#include <iostream.h>
int main()
{
int n = 5, x = 1;
for(int i = 1; i <= n; i++)
{
for(int j = 1; j <= i; j++)
{
if (j == 1 || j == i || i == n)
{
cout<<x++<<" ";
}
else
{
cout<<" "; // 2ws
}
}
cout<<endl;
}
return 0;
}
Java
class PatternProg
{
public static void main(String args[])
{
int n = 5;
int x = 1;
for (int i = 1; i <= n; i++)
{
for (int j = 1; j <= i; j++)
{
if (j == 1 || j == i || i == n)
{
System.out.printf("%3d",x);
x++;
}
else
{
System.out.print(" "); //3ws
}
}
System.out.println();
}
}
}
C#
using System;
class PatternProg
{
public static void Main()
{
int n = 5;
int x = 1;
for (int i = 1; i <= n; i++)
{
for (int j = 1; j <= i; j++)
{
if (j == 1 || j == i || i == n)
{
Console.Write("{0,3:D}", x);
x++;
}
else
{
Console.Write(" "); //3ws
}
}
Console.WriteLine();
}
Console.ReadKey(true);
}
}
Python
n = 5
d = 1
for x in range(1, n + 1):
for y in range(1, x + 1):
if y == 1 or y == x or x == n:
print("{:2d} ".format(d), end="")
d += 1
else:
print(" ", end="") # 3ws
print()