﻿ C++ Exercises: Display the sum of the specified series - w3resource

# C++ Exercises: Display the sum of the specified series

## C++ For Loop: Exercise-23 with Solution

Write a program in C++ to display the sum of the series [ 9 + 99 + 999 + 9999 ...].

Pictorial Presentation:

Sample Solution:-

C++ Code :

``````#include <iostream>
using namespace std;

int main()
{
long int n, i, t = 9;
int sum = 0;
cout << "\n\n Display the sum of the series [ 9 + 99 + 999 + 9999 ...]\n";
cout << "-------------------------------------------------------------\n";
cout << " Input number of terms: ";
cin >> n;

for (i = 1; i <= n; i++)
{
sum += t;
cout << t << "  ";
t = t * 10 + 9;
}
cout << "\n The sum of the sarise = " << sum << endl;
}
``````

Sample Output:

``` Display the sum of the series [ 9 + 99 + 999 + 9999 ...]
-------------------------------------------------------------
Input number of terms: 5
9  99  999  9999  99999
The sum of the sarise = 111105
```

Flowchart:

C++ Code Editor:

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## 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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