1. The problem is to calculate the area of a square, which is the length of one side squared. 2. The formula for the area $A$ of a square with side length $s$ is $$A = s^2$$. 3. In C++, define a variable for the side length, input its value, then compute the area by squaring the side length. 4. Here's a simple code snippet: ```cpp #include using namespace std; int main() { double side, area; cout << "Enter side length of square: "; cin >> side; area = side * side; cout << "Area of square is " << area << endl; return 0; } ``` This code takes the side length as input and outputs the square's area.