Casio fx-3650P

The calculator is available in six modes:^[4]

• Basic arithmetic calculations
• Complex number calculations
• Standard deviation calculations
• Regression calculations
• Base-n calculations
• Programs

• Arithmetic calculations^[5]
• Fraction operations^[6]
  • Fraction calculations^[6]
  • Decimal to fraction conversions^[6]
  • Mixed fraction to improper fraction conversions^[7]
• Percentage calculations^[7]
• Degrees, minutes, seconds calculations^[8]
• Rounding (must be used with Fix decimal display mode)^[8]
• Trigonometric functions^[9]
• Hyperbolic function^[10]
• Logarithm^[10]
• Natural logarithm^[10]
• Antilogarithm^[10]
• Differential calculus^[11]
• Integral calculus^[11]

In this mode, if the result has both real and imaginary parts, an "R↔I" symbol will appear at the top right corner.^[12]

• Absolute value and argument calculations^[13]
• Rectangular↔polar form display^[13]
• Conjugate calculations^[14]

This mode is for statistical calculation. For some input data, the sum of squares of values (Σx²), sum of values (Σx), number of data (n), sample standard deviation (xσn-1) and population standard deviation (xσn) can be calculated.^[15]

This mode is for statistical calculation and can be divided further into:^[16]

• Linear regression: y=A+Bx^[17]
• Logarithmic regression: y=A+B*ln x^[17]
• Exponential regression: ln y=ln A+Bx^[17]
• Power regression: y=A+x^B[17]
• Inverse regression: y=A+B/x^[18]
• Quadratic regression: y=A+Bx+Cx^2[18]

For some input ordered pairs, one of the below can be calculated.^[19] (The availability differs from modes.^[19])

Σx², Σx, n, Σy², Σy, Σxy, ${\displaystyle {\bar {x}}}$, xσn, xσn-1, ${\displaystyle {\bar {y}}}$, yσn, yσn-1, Regression coefficient A, Regression coefficient B, Correlation coefficient r, ${\displaystyle {\hat {x}}}$, ${\displaystyle {\hat {y}}}$, Σx³, Σx²y, Σx⁴, Regression coefficient C, ${\displaystyle {\hat {x}}}$₁and ${\displaystyle {\hat {x}}}$₂

The calculator can hold up to four programs with a total capacity of 360 bytes.

Program commands:^[20]

• ? – Operator input command, used when user's input is required. Usually used with → (variable)
• → – Assign to variable command, to assign the value before it to the variable after it. Always used as (value)→(variable).
• : – Multi-statement separator, separate program statements
• ◢ – Output command, output the value
• ${\displaystyle \Rightarrow }$ – Conditional jump, jump when conditions are met
• = – Relational operator
• ≠ – Relational operator
• > – Relational operator
• ${\displaystyle \geqq }$ – Relational operator
• Goto – Unconditional jump, jump to label, otherwise Lbl
• Lbl – Label, jump destination

Conditional jumps^[21] should be used in the syntax:
condition ${\displaystyle \Rightarrow }$ statement 1 : statement 2
When condition is true, statement 1 is executed, then statement 2 is executed. If condition is false, statement 1 is skipped and statement 2 is executed.

E.g.: ...A=0${\displaystyle \Rightarrow }$A+1→B:C+5→D:... If A=0, both A+1→B and C+5→D is executed. If A≠0, only C+5→D is executed.

Unconditional jumps^[20] use Goto and Lbl to operate.

When Goto n (where n is an integer in 0-9) is executed, the program will jump to Lbl n. Loops can be created with unconditional jumps.

The calculator will perform a system check when shift, 7 and ON are pressed together. The system check has three parts.

• Elements check: All display elements are turned on when the system check is initiated. Pressing shift turns the elements off and proceeds to the display check.

• Display check: The dot matrix screen will display "24      PRG13" and the LCD screen will display "0000000000 ⁰⁰". Pressing shift proceeds by displaying "BBBBBBBBBB" and "1111111111 ¹¹", then "CCCCCCCCCC" and "222222222 ²²" and so on up till "JJJJJJJJJJ" and "9999999999 ⁹⁹". Pressing shift proceeds to the key check.

• Key check: Press shift causes the LCD to display 1. The display increments by 1 for each press of alpha, up, down, left, and right in order. Afterward, pressing MODE, prog, ${\displaystyle \textstyle \int }$dx, x⁻¹, x³, and so on up till Ans causes the displays to become "24      OK" and "13" upon pressing EXE (the displays differ depending on version, the aforementioned case is for version 4 of the calculator which is the latest version). Pressing ON then ends the system check.