Q(uick)BASIC Function: MKC$
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MKC$
A function that converts numeric values to string values
Worth knowing
Useful and cross-version information about the programming environments of QBasic and QuickBasic.
Syntax
- MKI$(integerexpression%)
- MKL$(long-integer-expression&)
- MKS$(single-precision-expression!)
- MKD$(double-precision-expression#)
- MKC$(currency-expression@)
Description/Parameter(s)
- MKI$ converts an integer to a 2-byte string.
- MKL$ converts a long-integer value to a 4-byte string.
- MKS$ converts a single-precision value to a 4-byte string.
- MKD$ converts a double-precision value to an 8-byte string.
- MKC$ converts a currency value to an 8-byte string.
Usage Notes
- MKI$, MKL$, MKS$, MKD$, and MKC$ are used with FIELD and PUT statements to write numbers to a random-access file. The functions convert numeric expressions to strings that can be stored in the strings defined in the FIELD statement.
- These functions are the inverse of CVI, CVL, CVS, CVD, and CVC.
- These BASIC record variables provide a more efficient and convenient way of reading and writing random-access files than some older versions of BASIC.
Example
This example uses the MKS$ and CVS functions to convert values to and from strings for storage in a random-access file.
If you run this program, you will be prompted to enter an account number. The account numbers in the sample data file ACCOUNT.INF are 1 through 5.
'Define a user type for the data records.
TYPE Buffer
AccName AS STRING * 25
Check AS STRING * 4
END TYPE
'Define a variable of the variable type.
DIM BankBuffer AS Buffer
OPEN "ACCOUNT.INF" FOR RANDOM AS #1 LEN = 29
CLS
RESTORE
READ AccName$, Check
I% = 0
DO WHILE UCASE$(AccName$) <> "END"
I% = I% + 1
BankBuffer.AccName = AccName$
BankBuffer.Check = MKS$(Check)
PUT #1, I%, BankBuffer
READ AccName$, Check$
IF AccName$ = "END" THEN EXIT DO
LOOP
CLOSE #1
DATA "Bob Hartzell", 300
DATA "Alice Provan", 150
DATA "Alex Landow", 75
DATA "Walt Riley", 50
DATA "Georgette Gump", 25
DATA "END", 0
OPEN "ACCOUNT.INF" FOR RANDOM AS #2 LEN = 29
FIELD #2, 25 AS AccName$, 4 AS Check$
DollarFormat$ = "$$#####.##"
DO
PRINT
DO
CLS
INPUT "Enter account # to update: ", Rec%
GET #2, Rec% 'Get the record
PRINT : PRINT "This is the account for "; AccName$
PRINT : INPUT "Is this the account you wanted"; R$
LOOP WHILE UCASE$(MID$(R$, 1, 1)) <> "Y"
'Convert string to single-precision value.
Checkamt! = CVS(Check$)
PRINT
PRINT "The opening balance for this account is";
PRINT USING DollarFormat$; Checkamt!
PRINT : PRINT "Enter the checks and cash withdrawals for this"
PRINT "account below. Enter 0 when finished."
PRINT
DO
INPUT "Enter amount -> ", Checkout!
Checkamt! = Checkamt! - Checkout!
LOOP UNTIL Checkout! = 0
PRINT
PRINT "Enter the deposits for this account below."
PRINT "Enter 0 when finished."
PRINT
DO
INPUT "Enter amount ->", Checkin!: Checkamt! = Checkamt! + Checkin!
LOOP UNTIL Checkin! = 0
PRINT
PRINT "The closing balance for this account is";
PRINT USING DollarFormat$; Checkamt!
'Convert single-precision number to string.
LSET Check$ = MKS$(Checkamt!)
PUT #2, Rec% 'Store the record.
PRINT : INPUT "Update another"; R$
LOOP UNTIL UCASE$(MID$(R$, 1, 1)) <> "Y"
CLOSE #2
KILL "ACCOUNT.INF"
END