A Program To find the product of first n natural number.

REM To find the product of first n natural numbers (Qbasic Code)
CLS
INPUT "Enter the number"; n
p = 1
FOR i = 1 TO n
    p = p * i
NEXT i
PRINT "The product upto"; n; "="; p
END


Using SUB Procedure
DECLARE SUB product (n)
CLS
INPUT "Enter the number"; n
CALL product(n)
END

SUB product (n)
p = 1
FOR i = 1 TO n
        p = p * i
NEXT i
PRINT "The product upto"; n; "="; p
END SUB


Using FUNCTION Procedure
DECLARE FUNCTION product (n)
CLS
INPUT "Enter the number"; n
PRINT product (n)
END

FUNCTION product (n)
p = 1
FOR i = 1 TO n
        p = p * i
NEXT i
product = p
END FUNCTION

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