# 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;
// Function to determine if a number is divisible by 3 or 7 exclusively (but not both)
bool test(int n)
{
// Returns true if n is divisible by 3 exclusively XOR (n is divisible by 7 exclusively)
return n % 3 == 0 ^ n % 7 == 0;
}
int main()
{
// Testing the test function with different input values
cout << test(3) << endl; // Output: 1 (true), divisible by 3 exclusively
cout << test(7) << endl; // Output: 1 (true), divisible by 7 exclusively
cout << test(21) << endl; // Output: 0 (false), divisible by both 3 and 7
return 0; // Return 0 to indicate successful completion
}
```

Sample Output:

1 1 0

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