In this problem, you will create a program that implements exception propagation through a method call chain (main() → calculate() → parse()), catches the exception at the appropriate level, and displays the result to standard output.

Exception Propagation

When calling methods A→B→C, an error in C propagates back B→A.

Propagation Flow

main() → calculate() → parse()
        ←←← exception propagates ←←←

Learning Points

• Exceptions propagate to callers in order
• Can be caught at any level
• Program terminates if not caught ultimately