Given positive integer n, print numeric pattern in form of an hourglass.
Examples :
Input : rows_no = 7 Output : 1 2 3 4 5 6 7 2 3 4 5 6 7 3 4 5 6 7 4 5 6 7 5 6 7 6 7 7 6 7 5 6 7 4 5 6 7 3 4 5 6 7 2 3 4 5 6 7 1 2 3 4 5 6 7
C++
// CPP code for hour glass // pattern. #include <iostream> using namespace std;
// Function definition void pattern( int rows_no)
{ int i, j, k;
// for loop for printing
// upper half
for (i = 1; i <= rows_no; i++) {
// printing i spaces at
// the beginning of each row
for (k = 1; k < i; k++)
cout << " " ;
// printing i to rows value
// at the end of each row
for (j = i; j <= rows_no; j++)
cout << j << " " ;
cout << endl;
}
// for loop for printing lower half
for (i = rows_no - 1; i >= 1; i--) {
// printing i spaces at the
// beginning of each row
for (k = 1; k < i; k++)
cout << " " ;
// printing i to rows value
// at the end of each row
for (j = i; j <= rows_no; j++)
cout << j << " " ;
cout << endl;
}
} // Driver code int main()
{ // taking rows value from the user
int rows_no = 7;
pattern(rows_no);
return 0;
} |
Java
// Java code for hour glass // pattern. import java.io.*;
class GFG
{ // Function definition
static void pattern( int rows_no)
{
int i, j, k;
// for loop for printing
// upper half
for (i = 1 ; i <= rows_no; i++) {
// printing i spaces at
// the beginning of each row
for (k = 1 ; k < i; k++)
System.out.print( " " );
// printing i to rows value
// at the end of each row
for (j = i; j <= rows_no; j++)
System.out.print(j + " " );
System.out.println();
}
// for loop for printing lower half
for (i = rows_no - 1 ; i >= 1 ; i--)
{
// printing i spaces at the
// beginning of each row
for (k = 1 ; k < i; k++)
System.out.print( " " );
// printing i to rows value
// at the end of each row
for (j = i; j <= rows_no; j++)
System.out.print(j + " " );
System.out.println();
}
}
// Driver code
public static void main (String[] args)
{
// taking rows value from the user
int rows_no = 7 ;
pattern(rows_no);
}
} // This code is contributed by vt_m. |
Python3
# Python3 code for hour glass pattern # Function definition def pattern(rows_no):
# for loop for printing upper half
for i in range ( 1 , rows_no + 1 ):
# printing i spaces at the
# beginning of each row
for k in range ( 1 , i):
print ( " " , end = "")
# printing i to rows value
# at the end of each row
for j in range (i, rows_no + 1 ):
print (j, end = " " )
print ()
# for loop for printing lower half
for i in range (rows_no - 1 , 0 , - 1 ):
# printing i spaces at the
# beginning of each row
for k in range ( 1 , i):
print ( " " , end = "")
# printing i to rows value
# at the end of each row
for j in range (i, rows_no + 1 ):
print (j, end = " " )
print ()
# Driver code # taking rows value from the user rows_no = 7
pattern(rows_no) # This code is contributed # by ihritik |
C#
// C# code for hour glass // pattern. using System;
class GFG
{ // Function definition
static void pattern( int rows_no)
{
int i, j, k;
// for loop for printing
// upper half
for (i = 1; i <= rows_no; i++) {
// printing i spaces at
// the beginning of each row
for (k = 1; k < i; k++)
Console.Write( " " );
// printing i to rows value
// at the end of each row
for (j = i; j <= rows_no; j++)
Console.Write(j + " " );
Console.WriteLine();
}
// for loop for printing lower half
for (i = rows_no - 1; i >= 1; i--)
{
// printing i spaces at the
// beginning of each row
for (k = 1; k < i; k++)
Console.Write( " " );
// printing i to rows value
// at the end of each row
for (j = i; j <= rows_no; j++)
Console.Write(j + " " );
Console.WriteLine();
}
}
// Driver code
public static void Main ()
{
// taking rows value from the user
int rows_no = 7;
pattern(rows_no);
}
} // This code is contributed by vt_m. |
PHP
<?php // PHP code for hour glass pattern // Function definition function pattern( $rows_no )
{ // for loop for printing
// upper half
for ( $i = 1; $i <= $rows_no ; $i ++)
{
// printing i spaces at
// the beginning of each row
for ( $k = 1; $k < $i ; $k ++)
echo " " ;
// printing i to rows value
// at the end of each row
for ( $j = $i ; $j <= $rows_no ; $j ++)
echo $j . " " ;
echo "\n" ;
}
// for loop for printing lower half
for ( $i = $rows_no - 1; $i >= 1; $i --)
{
// printing i spaces at the
// beginning of each row
for ( $k = 1; $k < $i ; $k ++)
echo " " ;
// printing i to rows value
// at the end of each row
for ( $j = $i ; $j <= $rows_no ; $j ++)
echo $j . " " ;
echo "\n" ;
}
} // Driver code $rows_no = 7;
pattern( $rows_no );
// This code is contributed by mits ?> |
Javascript
<script> // Javascript code for hour glass // pattern. // Function definition
function pattern( rows_no)
{
let i, j, k;
// for loop for printing
// upper half
for (i = 1; i <= rows_no; i++)
{
// printing i spaces at
// the beginning of each row
for (k = 1; k < i; k++)
document.write( " " );
// printing i to rows value
// at the end of each row
for (j = i; j <= rows_no; j++)
document.write(j + " " );
document.write( "<br/>" );
}
// for loop for printing lower half
for (i = rows_no - 1; i >= 1; i--)
{
// printing i spaces at the
// beginning of each row
for (k = 1; k < i; k++)
document.write( " " );
// printing i to rows value
// at the end of each row
for (j = i; j <= rows_no; j++)
document.write(j + " " );
document.write( "<br/>" );
}
}
// Driver code
// taking rows value from the user
let rows_no = 7;
pattern(rows_no);
// This code is contributed by gauravrajput1 </script> |
Output :
1 2 3 4 5 6 7 2 3 4 5 6 7 3 4 5 6 7 4 5 6 7 5 6 7 6 7 7 6 7 5 6 7 4 5 6 7 3 4 5 6 7 2 3 4 5 6 7 1 2 3 4 5 6 7
Time Complexity : O(rows_no*rows_no) ,where rows_no is rows value taken from user.
Space Complexity : O(1) ,as we are not using any extra space.