Method Chaining (Returning *this)

Problem Statement

Create a `Builder` class with a private `int value = 0`. Implement two methods: `add(int v)` and `sub(int v)`. Both must return a reference to the current object (`Builder&`) by returning `*this`. Add a `print()` method to output ‘Value: [value]’. Read two integers, add the first, subtract the second using method chaining: `b.add(x).sub(y).print();`.

Input Format

Two space-separated integers.

Output Format

Print the chained math result.

Constraints

None

Sample Input

10 3

Sample Output

Value: 7

Explanation

Returning a dereferenced `this` pointer as a reference enables fluent interface design, where multiple method calls can be chained sequentially on a single line.

Starter Code

#include <iostream>

class Builder {
    // Implement value, add, sub, and print
};

int main() {
    // Read input and chain methods on a single line
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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