Calculator3

Fix the bug that draw wrong graph after hit twice equal button.

Features:

graph
functionality

1. work with floating point numbers

2. offer the +, -, ×, ÷ basic binary operators.

3. offer the cos(), sin(), tan(), abs(), x^2, x^3, lg(), rand() bacic unary operators.

4. backspace(right side of the display screen) and all clear button

5. click the backspace button "<-" until the last digit left will cause undo.

6. a description screen that shows the calculating steps.

7. add variable using "M" button.

8. using "➝ M" button to set or reset the value of the "M" variable, then recalculate the expressions.

9. using "~" button to generate graph.
   appearance

10. original ios calculator colors.

11. good screen fit.

Calculator3

new features:

1. graph

functionality

1. work with floating point numbers
2. offer the +, -, ×, ÷ basic binary operators.
3. offer the cos(), sin(), tan(), abs(), x^2, x^3, lg(), rand() bacic unary operators.
4. backspace(right side of the display screen) and all clear button
5. click the backspace button "<-" until the last digit left will cause undo.
6. a description screen that shows the calculating steps.
7. add variable using "M" button.
8. using "➝ M" button to set or reset the value of the "M" variable, then recalculate the expressions.
9. using "~" button to generate graph.

appearance

1. original ios calculator colors.
2. good screen fit.

calculator2

new features:
1. undo
2. variables

functionality

1. work with floating point numbers
2. offer the +, -, ×, ÷ basic binary operators.
3. offer the cos(), sin(), tan(), abs(), x^2, x^3, lg(), rand() bacic unary operators.
4. backspace(right side of the display screen) and all clear button
5. click the backspace button "<-" until the last digit left will cause undo.
6. a description screen that shows the calculating steps.
7. add variable using "M" button.
8. using "➝ M" button to set or reset the value of the "M" variable, then recalculate the expressions.

appearance

1. original ios calculator colors.
2. good screen fit.

Calculator

functionality

1. work with floating point numbers
2. offer the +, -, ×, ÷ basic binary operators.
3. offer the cos(), sin(), tan(), abs(), x^2, x^3, lg(), rand() bacic unary operators.
4. backspace(right side of the display screen) and all clear button
5. a description screen that shows the calculating steps.

appearance

1. original ios calculator colors.
2. good screen fit.