# C++ Exercises: Find the Armstrong number for a given range of number

## C++ Numbers: Exercise-44 with Solution

Write a program in C++ to find the Armstrong number for a given range of number.

/*When the sum of the cube of the individual digits of a number

is equal to that number, the number is called Armstrong number. For example 153.

Sum of its divisor is 13 + 53;+ 33; = 1+125+27 = 153*/

**Sample Solution**:

**C++ Code:**

```
#include <iostream>
#include <math.h>
using namespace std;
int main()
{
int num, r, sum, t, mm;
int sno, eno;
cout << "\n\n Find the Armstrong number for a given range of number:\n";
cout << "-----------------------------------------------------------\n";
cout << " Input starting number of range: ";
cin >> sno;
cout << " Input ending number of range: ";
cin >> eno;
cout << " Armstrong numbers in given range are: " << endl;
for (num = sno; num <= eno; num++)
{
t = num;
sum = 0;
while (t != 0)
{
r = t % 10;
mm = pow(r, 3);
sum = sum + mm;
t = t / 10;
}
if (sum == num)
cout << num << " ";
}
cout << endl;
}
```

Sample Output:

Find the Armstrong number for a given range of number: ----------------------------------------------------------- Input starting number of range: 25 Input ending number of range: 200 Armstrong numbers in given range are: 153

**Flowchart: **

**C++ Code Editor:**

** Contribute your code and comments through Disqus.**

**Previous:** Write a C++ program to check whether a given number is an Armstrong number or not.

**Next:** Write a program in C++ to check whether a number is a Strong Number or not.

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

## C++ Programming: Tips of the Day

**How to use the PI constant in C++?**

On some (especially older) platforms (see the comments below) you might need to

#define _USE_MATH_DEFINES and then include the necessary header file:#include<math.h>

and the value of pi can be accessed via:

M_PI

In math.h (2014) it is defined as:

# define M_PI 3.14159265358979323846 /* pi */

but check your math.h for more. An extract from the "old" math.h (in 2009):

/* Define _USE_MATH_DEFINES before including math.h to expose these macro * definitions for common math constants. These are placed under an #ifdef * since these commonly-defined names are not part of the C/C++ standards. */

However:

- on newer platforms (at least on my 64 bit Ubuntu 14.04) I do not need to define the _USE_MATH_DEFINES
- On (recent) Linux platforms there are long double values too provided as a GNU Extension:

# define M_PIl 3.14159265358979323846

Ref: https://bit.ly/3G4BgzQ

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