﻿ C++ Exercises: Find Harshad Number between 1 to 100 - w3resource

# C++ Exercises: Find Harshad Number between 1 to 100

## C++ Numbers: Exercise-21 with Solution

Write a program in C++ to find Harshad Number between 1 to 100.

Sample Solution:

C++ Code :

``````#include<bits/stdc++.h>
using namespace std;
{
int s = 0;
int tmp;
for (tmp=n; tmp>0; tmp /= 10)
s += tmp % 10;
return (n%s == 0);
}
int main()
{
int i;
cout << "\n\n Find Harshad Numbers between 1 to 100: \n";
cout << " ---------------------------------------------------\n";
cout << " The Harshad Numbers are: "<<endl;
for(i=1;i<=100;i++)
{
cout << i<<" ";
}
cout << endl;

}
``````

Sample Output:

``` Find Harshad Numbers between 1 to 100:
---------------------------------------------------
The Harshad Numbers are:
1 2 3 4 5 6 7 8 9 10 12 18 20 21 24 27 30 36 40 42 45 48 50 54 60 63 70 72 80 81 84 90 100
```

Flowchart:

C++ Code Editor:

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## 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:

1. on newer platforms (at least on my 64 bit Ubuntu 14.04) I do not need to define the _USE_MATH_DEFINES
2. 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