Answer / Jitendra Pratap Singh

In C++, you can use bit manipulation to calculate the square of a 5-digit number without using BigInt or exponent. Here's an example:

```cpp
#include <iostream>
using namespace std;

void square(int num) {
int square = num << 1;
if (num & 1) { // If the least significant bit is set, add the number itself
square |= num;
}
}

int main() {
int num;
cout << "Enter a 5-digit number: ";
cin >> num;
square(num);
cout << "The square of the given number is: " << square << endl;
return 0;
}

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