Answer / Arun Prakash Gupta

Here's a simple C++ program that accomplishes the encryption process you described:
```
#include <iostream>
using namespace std;
void swap(int& a, int& b) {
int temp = a;
a = b;
b = temp;
}
int main() {
int number;
cout << "Enter a 4-digit number: ";
cin >> number;
// Encrypt each digit
number = (number / 1000 + 7) % 10 * 1000 +
(number / 100 % 10 + 7) % 10 * 100 +
(number / 10 % 10 + 7) % 10 * 10 +
(number % 10 + 7) % 10;
// Swap first and third digits, second and fourth
swap(number / 1000, number % 10);
swap((number / 100) % 10, number % 100 / 10);
cout << "Encrypted number: " << number;
return 0;
}```

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