How can i print the mirrored left inverted number pattern in c++?

Question

This is the code I tried but I need a pattern like this:

Please help me with the code.

#include <iostream>
using namespace std;

int main()
{
    int rows;

    cout << "Enter number of rows: ";
    cin >> rows;

    for(int i = rows; i >= 1; --i)
    {
        for(int j = 1; j <= i; ++j)
        {
            cout << j << " ";
        }
        cout << endl;
    }

    return 0;
}

The code currently prints:

[How to debug small programs](https://ericlippert.com/2014/03/05/how-to-debug-small-programs/) — Filburt, Jul 23 '21 at 06:56
Where do you print the extra spaces to make the numbers right aligned? — Alan Birtles, Jul 23 '21 at 07:01

Wais Kamal · Answer 1 · 2021-07-23T07:06:09.170

1

You need to use increasing loops:

for(int i = 1; i <= rows; i++) {
    for(int j = 1; j <= rows; j++) {
        if(j < i) {
            cout << "  ";
        } else {
            cout << j << " ";
        }
    }
    cout << endl;
}

edited Jul 23 '21 at 07:06

answered Jul 23 '21 at 07:01

Wais Kamal

5,858
2
17
36

this doesn't produce the desired pattern: https://godbolt.org/z/e47r9bx3K – Alan Birtles Jul 23 '21 at 07:03
You mean the indentation? Ok I will edit, though it still fails if rows > 10. – Wais Kamal Jul 23 '21 at 07:06

score 1 · Answer 2 · answered Jul 23 '21 at 07:10

1

You must include <iomanip>

for (int i = 1; i <= row; i++)
{
    cout << setw(i * 2 - 1);
    for (int j = i; j <= row; j++)
    {
        cout << j << " ";
    }
    cout << endl;
}

answered Jul 23 '21 at 07:10

secuman

539
4
12

score 0 · Accepted Answer · answered Jul 23 '21 at 07:42

we should know that the space of each line from left increases frequently.you did not choose loops start and end correctly.outer loop must start from 1 to rows and inner loop must start from index of outer loop to rows.as we see the space of each line increases and first line has no space , so we define a variable named 'k' to hold sapces count and each time we increase it by step 2.

#include <iostream>
using namespace std;
//by Salar Ashgi
void space(int n)
{
    for(int i=1;i<=n;i++)
    cout<<" ";
}
int main()
{
    int rows;
    cout<<"Enter number of rows>> ";
    cin>>rows;
    int k=0;
    for(int i=1;i<=rows;i++)
    {
        space(k);
        for(int j=i;j<=rows;j++)
        {
            cout<<j<<" ";
        }
        cout<<endl;
        k+=2;
    }
}

How can i print the mirrored left inverted number pattern in c++?

3 Answers3