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
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 |
#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); } |
Output
| loop | If condition | Output | |
| true | false | ||
| i=1
j=1 |
If(i==1||i==n||j==1||j==n) | Â Â Â Â Â Â * | Â Â Â Â Â Â Â Â – |
| i=1
j=2 |
If(i==1||i==n||j==1||j==n) | Â Â Â Â Â Â * | Â Â Â Â Â Â Â Â – |
| 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) | Â Â Â Â Â Â * | Â Â Â Â Â Â Â Â – |
| i=2
j=2 |
If(i==1||i==n||j==1||j==n) | Â Â Â Â Â Â Â – | Â Â Â Â Â Â Â Â * |
| I=2
J=3 |
If(i==1||i==n||j==1||j==n) | Â Â Â Â Â Â * | Â Â Â Â Â Â Â Â – |
| I=3
J=1 |
If(i==1||i==n||j==1||j==n) | Â Â Â Â Â Â * | Â Â Â Â Â Â Â Â – |
| i=3
j=2 |
If(i==1||i==n||j==1||j==n) | Â Â Â Â Â Â * | Â Â Â Â Â Â Â – |
| I=3
J=3 |
If(i==1||i==n||j==1||j==n) | Â Â Â Â Â Â Â * | Â Â Â Â Â Â Â – |
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 | Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 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
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*** | |
| 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
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|||
| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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
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***
*-* *** |
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| 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
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