1. 1 © 2000 John Urrutia. All rights reserved. Qbasic Input, Calculations and Functions

2. 2 © 2000 John Urrutia. All rights reserved. The INPUT statement INPUT variable-list INPUT “prompt ” ; or, variable-list  prompt – any valid string  ; – Question mark generated , – No Question mark generated  variable-list – mix and match separate with commas

3. 3 © 2000 John Urrutia. All rights reserved. DATA & READ statements DATA const, const, const, …  Provides internal storage  Accessed sequentially READ var, var, var, …  Populates variables from DATA RESTORE label  Resets the some or all the DATA

4. 4 © 2000 John Urrutia. All rights reserved. Calculations Order of operations (precedence)  ^(Power)  +, -(Unary)  *, /, \, MOD, +, -(Arithmetic) , >=, <>, =(Relational)  Boolean operators  NOT, AND, OR, XOR, EQV, IMP

5. 5 © 2000 John Urrutia. All rights reserved. Boolean Operators NOT– negation (bit-wise complement) AND– logical addition (conjunction) OR– logical subtraction (disjunction) XOR– exclusive “or” EQV– logical equivalence IMP– logical implication

6. 6 © 2000 John Urrutia. All rights reserved. NOT Boolean Truth Tables Expr NOT FalseTrue FalseTrue

7. 7 © 2000 John Urrutia. All rights reserved. AND Boolean Truth Tables Expr 1Expr 2 AND True FalseTrue False TrueFalse

8. 8 © 2000 John Urrutia. All rights reserved. OR Boolean Truth Tables True FalseTrue FalseTrue False Expr 1Expr 2 OR

9. 9 © 2000 John Urrutia. All rights reserved. XOR Boolean Truth Tables True False True FalseTrue False Expr 1Expr 2 XOR

10. 10 © 2000 John Urrutia. All rights reserved. Arithmetic Operators * – Multiplication / – Division \ – Integer Division MOD – Modula (remainder) + – Addition - – Subtraction

11. 11 © 2000 John Urrutia. All rights reserved. Functions A function is a set of instructions that perform a specific task.  FunctionName (argument1, …) Built-in & User defined X$ = UCASE$(X$)

12. 12 © 2000 John Urrutia. All rights reserved. Built-in Functions Mathematic  SQR, EXP, LOG Trigonometric  SIN, COS, TAN String  RIGHT$, LEFT$, MID$

13. 13 © 2000 John Urrutia. All rights reserved. Built-in Functions Conversions  MKI$ - CVI, MKD$ - CVD  CHR$ - ASC System  DATE$ - TIME$