Constraint Handling Rules

Hello! Today we'll talk about constraint handling rules, or what we call CHR.

Have you ever played with building blocks and had to follow certain rules or constraints to build a tower? Just like that, computers also have rules they follow to solve problems. Constraint handling rules or CHR is one such set of rules that computers follow to solve problems.

CHR is like a set of instructions that a computer follows. It helps the computer solve complex problems by breaking them down into smaller, easier-to-solve pieces. Just like we break a building block tower into individual blocks to see how we can improve it or build a new tower using the same blocks.

These rules or instructions in CHR are used to build programs that can make decisions based on certain constraints or rules. A constraint is like a rule that a program needs to follow—for example, a program needs to calculate the area of a triangle, but it cannot accept negative numbers. So, the constraint would be to ensure all input values are positive.

The rules in CHR can be updated and refined to create better solutions to complex problems. It's like adding or removing blocks from the building tower to create a better design.

So, in conclusion, constraint handling rules are a set of guidelines or rules that computers follow to solve complex problems by breaking them down into smaller, easier-to-solve pieces. These rules help the computer make decisions based on certain constraints and can be updated or refined to find better solutions.