﻿ C++ : If a number is a multiple of 3 or 7, but not both

# C++ Exercises: Check if a given non-negative number is a multiple of 3 or 7, but not both

## C++ Basic Algorithm: Exercise-40 with Solution

Write a C++ program to check if a given number that is not negative is a multiple of 3 or 7, but not both.

Sample Solution:

C++ Code :

``````#include <iostream>

using namespace std;

bool test(int n)
{
return n % 3 == 0 ^ n % 7 == 0;
}

int main()
{
cout << test(3) << endl;
cout << test(7) << endl;
cout << test(21) << endl;
return 0;
}
``````

Sample Output:

```1
1
0
```

Pictorial Presentation: Flowchart: C++ Code Editor:

What is the difficulty level of this exercise?

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## C++ Programming: Tips of the Day

Static member initialization in a class template

Just define it in the header:

```template<typename T>
struct S
{
static double something_relevant;
};

template<typename T>
double S<T>::something_relevant = 1.5;```

Since it is part of a template, as with all templates the compiler will make sure it's only defined once.

Ref: https://bit.ly/3MxgJH9

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