Given two integers a and b and an operator op — one of "+", "-", "*", or "/" — perform that operation on a and b and return the result. The if-else chainIf-Else ChainA sequence of if / else-if / else blocks, tried in order until one condition matches. version tests each operator string one at a time. The switch statementSwitch StatementA multi-way branch on a single value's exact matches — jumps directly to the matching case instead of testing conditions sequentially. version expresses the exact same four-way choice more directly, since every branch is an exact match against one fixed value rather than a general condition.