Write a C++ program to print hollow sandglass star pattern using for loop.
#include<iostream>
using namespace std;
int main()
{
int rows, i, j, k;
cout << "Enter Hollow Sandglass Star Pattern Rows = ";
cin >> rows;
cout << "Printing Hollow Sandglass Star Pattern\n";
for (i = 1; i <= rows; i++)
{
for (j = 1; j < i; j++)
{
cout << " ";
}
for (k = i; k <= rows; k++)
{
if (i == 1 || k == i || k == rows)
{
cout << "* ";
}
else
{
cout << " ";
}
}
cout << "\n";
}
for (i = rows - 1; i >= 1; i--)
{
for (j = 1; j < i; j++)
{
cout << " ";
}
for (k = i; k <= rows; k++)
{
if (i == 1 || k == i || k == rows)
{
cout << "* ";
}
else
{
cout << " ";
}
}
cout << "\n";
}
}
This C++ program displays the hollow sandglass pattern of stars using a while loop.
#include<iostream>
using namespace std;
int main()
{
int rows, i, j, k;
cout << "Enter Hollow Sandglass Star Pattern Rows = ";
cin >> rows;
cout << "Printing Hollow Sandglass Star Pattern\n";
i = 1;
while (i <= rows)
{
j = 1;
while (j < i)
{
cout << " ";
j++;
}
k = i;
while (k <= rows)
{
if (i == 1 || k == i || k == rows)
{
cout << "* ";
}
else
{
cout << " ";
}
k++;
}
cout << "\n";
i++;
}
i = rows - 1;
while (i >= 1)
{
j = 1;
while (j < i)
{
cout << " ";
j++;
}
k = i;
while (k <= rows)
{
if (i == 1 || k == i || k == rows)
{
cout << "* ";
}
else
{
cout << " ";
}
k++;
}
cout << "\n";
i--;
}
}
Enter Hollow Sandglass Star Pattern Rows = 10
Printing Hollow Sandglass Star Pattern
* * * * * * * * * *
* *
* *
* *
* *
* *
* *
* *
* *
*
* *
* *
* *
* *
* *
* *
* *
* *
* * * * * * * * * * C++ program to print hollow sandglass star pattern using a do while loop
#include<iostream>
using namespace std;
int main()
{
int rows, i, j, k;
cout << "Enter Hollow Sandglass Star Pattern Rows = ";
cin >> rows;
cout << "Printing Hollow Sandglass Star Pattern\n";
i = 1;
do
{
j = 1;
do
{
cout << " ";
} while (j++ <= i);
k = i;
do
{
if (i == 1 || k == i || k == rows)
{
cout << "* ";
}
else
{
cout << " ";
}
} while (++k <= rows);
cout << "\n";
} while (++i <= rows);
i = rows - 1;
do
{
j = 1;
do
{
cout << " ";
} while (j++ <= i);
k = i;
do
{
if (i == 1 || k == i || k == rows)
{
cout << "* ";
}
else
{
cout << " ";
}
} while (++k <= rows);
cout << "\n";
} while (--i >= 1);
}
Enter Hollow Sandglass Star Pattern Rows = 13
Printing Hollow Sandglass Star Pattern
* * * * * * * * * * * * *
* *
* *
* *
* *
* *
* *
* *
* *
* *
* *
* *
*
* *
* *
* *
* *
* *
* *
* *
* *
* *
* *
* *
* * * * * * * * * * * * * In this C++ example, HollowSandglassPattern function allows user to enter the character and prints the hollow sandglass pattern of the given character.
#include<iostream>
using namespace std;
void HollowSandglassPattern(int rows, char ch)
{
int i, j, k;
for (i = 1; i <= rows; i++)
{
for (j = 1; j < i; j++)
{
cout << " ";
}
for (k = i; k <= rows; k++)
{
if (i == 1 || k == i || k == rows)
{
cout << ch << " ";
}
else
{
cout << " ";
}
}
cout << "\n";
}
for (i = rows - 1; i >= 1; i--)
{
for (j = 1; j < i; j++)
{
cout << " ";
}
for (k = i; k <= rows; k++)
{
if (i == 1 || k == i || k == rows)
{
cout << ch << " ";
}
else
{
cout << " ";
}
}
cout << "\n";
}
}
int main()
{
int rows;
char ch;
cout << "Enter Hollow Sandglass Star Pattern Rows = ";
cin >> rows;
cout << "Enter Character for Hollow Sandglass Pattern = ";
cin >> ch;
cout << "Printing Hollow Sandglass Star Pattern\n";
HollowSandglassPattern(rows, ch);
}
Enter Hollow Sandglass Star Pattern Rows = 15
Enter Character for Hollow Sandglass Pattern = $
Printing Hollow Sandglass Star Pattern
$ $ $ $ $ $ $ $ $ $ $ $ $ $ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $ $ $ $ $ $ $ $ $ $ $ $ $ $