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However, they have a much faster access than formatted files. Binary or unformatted files are machine dependent, not portable.
#Fortran 90 open portable#
Text or formatted files are human readable and portable (machine independent).Please not thatįmt is only applicable to formatted files (text files only) If the keyword "unit" is used, you also need to use "fmt" for specifying the format. Writing to and reading from a file is done by giving the unit number as a parameter: status: what to do with the file ('keep', 'remove').recl: record length, (input) integer for direct access files only.err: the label number to jump upon error.iostat: error indicator, (output) integer (non zero only upon an error).access: direct or sequential file access ('direct','sequential','stream').form: text or binary file ('formatted', 'unformatted').action: file operation mode ('write','read','readwrite').position: offset, where to start writing ('append').status: existence of the file ('old', 'new', 'replace', 'scratch', 'unknown').These units are opened by default and should not be re-opened nor closed by users.0 is output for standard (system) error messages.The unit numbers 0,5 and 6 are predefined. The first parameter is the unit number and the keyword unit= can be omitted.OPEN(10, file='output.dat', status='new') Subsequent writes (or reads) must refer to a known unit number (used for open).File must be opened with an OPEN statement, in which the unit number and (optionally) the filename are given.Your program should not copy accounts between these two files if a transaction is to be failed.Writing to or reading from a file is similar to writing onto a terminal screen or reading from a keyboard. Then when you copy the data back from the temporary file to the account file, perform the necessary transactions. By using a temporary file, you can copy the accounts from the account file to the temporary file. There is a way in FORTRAN to create a temporary file. Here is an example of the account file: C 12345 Smith John 100.000 10 0.00 10.01 = 10.01%)įor names with fewer than 15 characters, the data will be padded to have width of 15 characters. Last name of account holder (15 characters)įirst name of account holder (15 characters)īalance of the account in the form xxxxx.xxxĪn integer field indicating how many checks have been cahsed this month (three digit)Īn interest rate in the form of xx.xx (e.g. Here is the format in the account file for one account (data fields are separated by exactly one space): Account type, S for saving, C for checking (1 character) If there is enough fund to cash the check but not the penalty, the transaction should go through and the resulting balance would be zero. There is a $0.25 penalty for each check cashed over the limit. There is a limit on how many checks can be cashed against a saving account. Your program needs to be able to handle the following transactions: For unsuccessful transaction, your program will print out the reason for the failed transaction. In addition, your program needs to print whether a transaction is successful. Your program needs print an error message on the screen and return to the menu. The user may perform transactions on accounts that are not available.
#Fortran 90 open update#
Your program needs to update the account file after each transaction. Your program is to provide an interactive menu for users to perform transactions on these accounts.
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You will be given a file which contains all the accounts in the bank (the file is named “account.txt”). This project is about writing a program to perform transactions on bank accounts. Does anyone explain what that is, and if it's possible, would you attach example of it? However, I did not understand this temporary OPEN file at all. This temporary file will read line by line to find what the user is looking for. My TA said that I have to use temporary file. I've been working on my project about bank account transactions (withdraw, deposit, check cashed, and balance inquiry) using "account.txt".