HTML:

• Input: number_0
• Input: number_1
• div: result_display
• button: add Functionality:
• function add_numbers()
• Adds two numbers together
• Two numbers are pulled from the inputs
• Result is put into result_display div’s contents

Additional Functionality:

• Add buttons / functions for:
  • subtract
  • divide
    • Take into account if the divisor is 0
  • multiply

HTML:

• 1 input (for operand/operator display)
• 1 input (for result display)
  • cannot be edited
• 10 buttons, 1 for each digit (0-9)
• 4 buttons, 1 per operator (+,-,/,*)
• 1 button, for an equal operator (=) Functionality:
• add, subtract, divide, multiply functions
• Each takes 2 numbers as input
• Each returns 1 number as output, the result of its math
• calculate function
• called by = / enter button
• uses a switch to pick which math function to run
• updates the result input with the value of the mathematical operation

• add decimal point
• add sign inversion ("2" becomes "(-2)" and vice versa)
• add exponent button "x^y" that calculates the first number raised to the power of the 2nd number"
• Add error message when dividing by 0

HTML:

• AC - clears all numbers, the operator, and the display
• Clear - clears only the current number and display

Functionality:

• Allow successive mathematical operations
  • For example, 2+3+4 should result in:
    • after pressing the 2nd +, should automatically total 2 + 3 and update the display (5)
    • Pressing 4 should take the previous result and show it added to 4 (5+4)
• Pressing a successive mathematical operation and then pressing = will perform the operation on that number as both number 1 and number 2, for example
  • press 1+2= (gives you 3)
  • press += (gives you 6)
  • press += (gives you 12)

HTML:

• Place a result field on the calculator to hold the result of all math Functionality:
• Pressing successive mathematical operations does not complete the operation, for example
  • 1+2+3+4+5 would not do anything until the = key is pressed
  • after the = key is pressed, would perform all math, yielding 15
  • put all results into the result field