Statements in QBASIC

A statement (for the QBASIC) is a set of instructions written by using keywords or commands of QBASIC. Every programming language uses keywords as a statement with certain syntax. The keywords have specific meaning in the QBASIC programming. The statements are the first stored in the memory and executed only when the RUN command is given.

Different statements used in QBASIC are as follows:

CLS Statement

The CLS statement clears the screen. If you write CLS statement in the middle of the program then you cannot see the outputs generated before execution of CLS because it clears the screen.
Syntax: CLS

LET Statement

LET is an assignment statement. It is used to assign the value to a variable. LET is an optional statement i.e. without using LET statement one can assign the value to a variable. The data type must match with the variable type otherwise type mismatch error will occur.
Syntax:|LET| variable = value or expression

Example:
CLS
INPUT " First Number"; A
INPUT "Second Number"; B
let Sum = A+B
PRINT " The Sum is"; S
END

REM Statement

It is a basic declaration statement that allows explanatory remarks to be inserted in a program. The remarks may be useful in a program to explain about different kinds of statements and user defined words. Adding comments in the program allows us to remind about the program and also helps other programmers to understand the logic of the program.
Syntax: REM < Remarks>

Example:
CLS
PRINT "Some text."
REM This text is ignored.
REM This program clears the output screen.
REM and then PRINT " Some text."

PRINT Statement

PRINT statement provides output on the screen. It prints the values of the expression on the screen. If the expression list is blank, no characters are printed. The expressions in the list may be numeric or string. In case of number, the negative number is preceded by a minus sign (-) but in positive number it is preceded by a space.

We can use semicolon and comma with a print statement which results differently than a normal PRINT statement. If expression list ends with comma or semicolon, the next PRINT statement prints on the same line. Comma provides a TAB space, but semicolon provides only one space.
Syntax: PRINT ["Message"]; expression

Example:
CLS
PRINT "Computer is an electronic machine."
PRINT
PRINT "IT's amazing."
PRINT 1000
PRINT " The number is: "; 20
END

Output
Computer is electronic machine
IT's amazing
1000
The number is: 20