Build a command-line calculator that takes two numbers and an operator, then returns the result. Test all operations: +, -, *, /, %.

• A command-line calculator that takes two numbers
• An operator
• Then returns the result

function calculator(a, b, op) {
  switch (op) {
    case '+': return a + b;
    case '-': return a - b;
    case '*': return a * b;
    case '/': return b !== 0 ? a / b : 'Error: division by zero';
// ...

• Addition works
• Subtraction works
• Multiplication works
• Division works
• Modulo works

• Use switch statement for multiple operation cases
• Check for division by zero before dividing
• Test edge cases: 0, negative numbers, division by zero

Build a command-line calculator that takes two numbers and an operator, then returns the result. Test all operations: +, -, *, /, %.

• A command-line calculator that takes two numbers
• An operator
• Then returns the result

function calculator(a, b, op) {
  switch (op) {
    case '+': return a + b;
    case '-': return a - b;
    case '*': return a * b;
    case '/': return b !== 0 ? a / b : 'Error: division by zero';
// ...

• Addition works
• Subtraction works
• Multiplication works
• Division works
• Modulo works

• Use switch statement for multiple operation cases
• Check for division by zero before dividing
• Test edge cases: 0, negative numbers, division by zero