C++ program to print a hollow square or rectangle star pattern

C++ program to print a hollow square or rectangle star pattern.

Flowchart to print hollow square or rectangle star pattern

C++ Source Code to print hollow square or rectangle star pattern

#include<iostream>
using namespace std;
int main()
{
	int n,i,j;
	cout<<"enter number of rows";
	cin>>n;
	i=1;
	do
	{
			j=1;
			do
			{
				if(i==1||i==n||j==1||j==n)
				{
					cout<<" *";
				} 
				else
				{
					cout<<"  ";
				}
				j++;
			}
			while(j<=n);
			cout<<"\n";
			i++;
		}
		while(i<=n);
}

#include<iostream>

using namespace std;

int main()

{

int n,i,j;

cout<<"enter number of rows";

cin>>n;

i=1;

{

j=1;

{

if(i==1||i==n||j==1||j==n)

{

cout<<" *";

}

else

{

cout<<" ";

}

j++;

}

while(j<=n);

cout<<"\n";

i++;

}

while(i<=n);

}

Output

print hollow square or rectangle star pattern in C++

loop	If condition	Output
		true	false
i=1 j=1	If(i==1\|\|i==n\|\|j==1\|\|j==n)	*	–
i=1 j=2	If(i==1\|\|i==n\|\|j==1\|\|j==n)	*	–
i=1 j=3	If(i==1\|\|i==n\|\|j—1\|\|j==n)	*	–
i=2 j=1	If(i=1\|\|i==n\|\|j==1\|\|j==n)	*	–
i=2 j=2	If(i==1\|\|i==n\|\|j==1\|\|j==n)	–	*
I=2 J=3	If(i==1\|\|i==n\|\|j==1\|\|j==n)	*	–
I=3 J=1	If(i==1\|\|i==n\|\|j==1\|\|j==n)	*	–
i=3 j=2	If(i==1\|\|i==n\|\|j==1\|\|j==n)	*	–
I=3 J=3	If(i==1\|\|i==n\|\|j==1\|\|j==n)	*	–

Excercise

Find the possible mistakes in the following Shamil’s Flow Table of the program to print a hollow square or rectangle star pattern.

Loop		If condition	What lines will executed	Actual work to do
Outer	Inner
1	1	T	1,2,3,4,,5,6,7,8, 9,10,11,12,13,14, 15,16,17,22,23,24	*
		F	1,2,3,4,5,6,7,8,9, 10,11,12,13,14, 18,19,20,21,22,23,24
	2,3	T	1,2,3,4,5,6,7,8, 9,10,11,12,13, 14,15,16,17,22, 23,24,{12,13,14, 15,16,17,22,23,24}²	***
		F	1,2,3,4,5,6,7,8, 9,10,11,12,13, 14,18,19,20,21, 22,23,24, {12,13,14,18,19, 20,21,22,23,24}²
2	1	T	1,2,3,4,5,6,7,8,9, 10,11,12,13,14, 15,16,17,22,23, 24,{12,13,14,15, 16,17,22,23,24}², 25,26,27 ,28,9,10,11,12, 13,14, 15,16, 17,22,23,24	*** *
		F	1,2,3,4,5,6,7,8,9, 10,11,12,13,14, 18,19,20,21,22, 23,24,{12,13,14, 18,19,20,21,22, 23,24}²,25,26, 27,9,10,11,12, 13,14,18,19,20, 21,22,23,24
	2	T	1,2,3,4,5,6,7,8, 9,10,11,12,13, 14,15,16,17, 22,23,24,{12,13, 14,15,16,17,22, 23,24}²,25,26, 27,9,10,11,12, 13,14,15,16,17, 22,23,24,12,13, 14,18,19,20,21, 22,23,24	*** *-
		F	1,2,3,4,5,6,7,8,9, 10,11,12,13,14, 18,19,20,21,22, 23,24,{12,13,14, 18,19,20,21,22, 23,24}²,25,26,27, 9,10,11,12,13,14, 18,19,20,21,22, 23,24,12,13,14, 15,16,17,22,23,24
	3	T	1,2,3,4,5,6,7,8,9, 10,11,12,13,14, 15,16,17,22,23, 24,{12,13,14,15, 16,17,22,23,24}², 25,26,27,9,10,11, 12,13,14,15,16, 17,22,23,24,12,13, 14,18,19,20,21, 22,23,24,12,13, 14,15,16,17,22,23,24	*** -
		F	1,2,3,4,5,6,7,8,9, 10,11,12,13,14, 18,19,20,21,22, 23,24,{12,13,14, 18,19,20,21,22, 23,24}²,25,26,27, 9,10,11,12,13, 14,18,19,20,21, 22,23,24,12,13, 14,15,16,17,22,23, 24,12,13,14,18,19, 20,21,22,23,24
3	1	T	1,2,3,4,5,6,,7,8,9, 10,11,12,13,14, 15,16,17,22,23,24, {12,13,14,15,16, 17,22,23,24}²,25, 26,27,9,10,11,12 ,13,14,15,16,17, 22,23,24,12,13, 14,18,19,20,21,22, 23,24,12,13,14, 15,16,17,22,23, 24,25,26,27,28,9, 10,11,12,13,14, 15,16,17,22,23,24	*** - *
		F	1,2,3,4,,5,6,7,8,9, 10,11,12,13,14,18, 19,20,21,22,23, 24,{12,13,14,18,19, 20,21,22,23,24}², 25,26,27,9,10,11, 12,13,14,18,19,20, 21,22,23,24,12,13, 14,15,16,17,22,23, 24,12,13,14,18,19, 20,21,22,23,24,25, 26,27,28,9,10,11, 12,13,14,18,19,20, 21,22,23,24
	2,3	T	1,2,3,4,5,6,7,8,9,10, 11,12,13,14,15,17, 22,23,24,{12,13, 14,15,16,17,22, 23,24}²,25,26,27, 9,10,11,12,13,14, 15,16,17,22,23,24, 12,13,14,18,19,20, 21,22,23,24,12,13, 14,15,16,17,22,23, 24,25,26,27,28,9, 10,11,12,13,14,15, 16,17,22,23,24, {12,13,14,15,16,17, 22,23,24}²,25,26,27,28	*** - ***
		F	1,2,3,4,,5,6,7,8,9, 10,11,12,13,14,18, 19,20,21,22,23,24, {12,13,14,18,19,20, 21,22,23,24}²,25, 26,27,9,10,11,12, 13,14,18,19,20,21, 22,23,24,12,13,14, 15,16,17,22,23,24, 12,13,14,18,19,20, 21,22,23,24,25,26, 27,28,9,10,11,12, 13,14,18,19,20,21, 22,23,24,{12,13,14, 18,19,20,21,22, 23,24}²,25,26,27,28

C++ program to print a hollow square or rectangle star pattern
By: Prof. Dr. Fazal Rehman | Last updated: October 21, 2023

Flowchart to print hollow square or rectangle star pattern

C++ Source Code to print hollow square or rectangle star pattern

Excercise

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