Begin2. Given the side of the square \(a\). Find its area \(S = a^2\).

Solution in Python 3:

a = int(input("Enter the side of the square (a): "))
S = a*a
print("Area of the square (S): ", S)

Solution in C++:

#include<iostream>
using namespace std;
int main(){
	double a, s;
	cout << "Enter the side of the square (a): ";
	cin >> a;
	s = a*a;
	cout << "Area of the square (S): " << s;
	return 0;
}