Introduction to QBASIC
Control Statement
Branching Statement
Looping Statement
Library Function
Array in QBASIC
Modular Programming
File Handling
Introduction to QBASIC
Introduction to QBasic Elements of QBASIC Operators in QBASIC Qbasic Statements
Control Statement
Control Statements in QBASIC
Branching Statement
IF ... THEN Statement IF ... THEN .... ELSE Statement IF ... THEN ... ELSEIF Statement SELECT CASE Statement GOTO Statement
Looping Statement
Introduction FOR ... NEXT Loop WHILE .... WEND DO ... LOOP Nested Loop in QBASIC
Library Function
Library Function in QBASIC Mathematical Library Functions (QBASIC) String Library Functions (QBASIC)
Array in QBASIC
Array in QBASIC
Modular Programming
Concept of Modular Programming SUB Procedure (QBASIC) FUNCTION Procedure (QBASIC)
File Handling
File Handling (QBASIC)

Library Function in QBASIC

A function is a built-in formula or a ready-made program that helps us to perform a certain task such as mathematical, financial, logical, etc. A function manipulates data passes to it and returns either a string or a numeric value. There are two types of functions in QBASIC Programming.

  1. User-defined function
  2. Built-in function

User-defined function: It is created by the programmer to perform the operations as per the requirements. It can be a numeric or string function.

Built-in function: It is a pre-defined program which is provided by QBASIC to perform some task easily. It gives many more built-in functions for manipulating strings, numbers. It makes our work easy. It is also known as Library functions. There are two types of built in function:

Mathematical Function String Functions
  • SQR : It calculate and return the square root of non-negative number
  • UCASE$ : It converts string values to uppercase.
  • MOD : It returns reminder, when one number is divide by another number.
  • LCASE$ : It converts string values to lowercase.
  • INT : It returns an integer of a given number.
  • LEFT$ : It extract and return the numbers of characters from the left of a string.
  • CINT : It returns nearest rounding numeric value from -32768 to 32767 as argument.
  • RIGHT$ : It extract and return the numbers of characters from the right of a string.
  • SGN : It returns the sign of numeric value.
  • MID$ : It is used to pick up the required strings from the string.
  • SIN : It returns the sign value of given number.a
  • LTRIM$ : It is used to remove the spaces from the left of the string.
  • COS : It is used to obtain the cosine value of a number.
  • RTRIM$ : it is used to remove the spaces from the right of the string.
  • TAN : It returns the tangent of a number.
  • VAL : If both strings are started with numeric value. This function can perform mathematical calculations among them.
  • ABS : It returns corresponding positive value.
  • ASC : It returns ASCII value of a character.
 
  • CHR$ : It returns character value of given ASCII code.
 
  • STR$ : It converts numeric value to string value, which cannot be used for mathematical calculation.
 
  • SPACE$ : It is used to put blank space.
 
  • TAB : It is used to put Tab.
 
  • DATE$ : It returns the current date.
 
  • TIME$ : It returns the current time.
 
  • LEN : It returns the length of a given string.
 
  • STRING$ : It returns a string of a specified length made up of a repeating character.

 


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