# C++ Exercises: Display the pattern power of 2, triangle

## C++ For Loop: Exercise-54 with Solution

Write a program in C++ to display the pattern like pyramid, power of 2.

**Sample Solution**:

**C++ Code :**

```
#include <iostream>
#include <math.h>
using namespace std;
int main()
{
int i, j, spc, n, mm, d = 1, k;
cout << "------------------------------------------------------\n";
cout << " Input the number of rows: ";
cin >> n;
//----------- space for first line ----------------------
for (i = 1; i <= n * 2 + 2 + 5; i++) //extra 5 spaces is the margin from left
cout << " ";
cout << pow(2, 0) << endl;
for (i = 1; i < n; i++)
{
//----------- printing spaces from 2nd line to end -------
for (k = 1; k <= n * 2 - d + 5; k++)
{
cout << " ";
}
//----------- print upto middle ----------------
for (j = 0; j < i; j++)
{
mm = pow(2, j);
cout << mm << " "; //print 2 spaces
}
//------------- print after middle to end -------
for (j = i; j >= 0; j--)
{
mm = pow(2, j);
cout << mm << " "; //print 2 spaces
}
d = d + 3;
cout << endl;
}
}
```

Sample Output:

Input the number of rows: 5 1 1 2 1 1 2 4 2 1 1 2 4 8 4 2 1 1 2 4 8 16 8 4 2 1

**Flowchart: **

**C++ Code Editor:**

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**Previous:** Write a program in C++ to display the pattern like right angle triangle with right justified using digits.

**Next:** Write a program in C++ to display such a pattern for n number of rows using number. Each row will contain odd numbers of number.
The first and last number of each row will be 1 and middle column will be the row number. n numbers of columns will appear in 1st row.

**What is the difficulty level of this exercise?**

## C++ Programming: Tips of the Day

**What is the "-->" operator in C/C++?**

--> is not an operator. It is in fact two separate operators, -- and >.

The conditional's code decrements x, while returning x's original (not decremented) value, and then compares the original value with 0 using the > operator.

To better understand, the statement could be written as follows:

while( (x--) > 0 )

Ref : https://bit.ly/3kOTBby

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