Answer / Mahavir Singh

Here's an example program in C++ to reverse a number:

```cpp
#include<iostream>
using namespace std;
void reverse(int n) {
int reversed = 0, remainder;
while (n != 0) {
remainder = n % 10;
reversed = reversed * 10 + remainder;
n /= 10;
}
cout << "Reversed number: " << reversed << endl;
}
int main() {
int num;
cout << "Enter a positive integer: ";
cin >> num;
reverse(num);
return 0;
}

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