StackOverflow2013

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primarykey
Id
4942412
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0
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0
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2011-02-09T07:42:18.423
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2011-02-09T07:42:18.423
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353615
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4941405
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text
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<p>As promised, here is a quick exmaple of a father-son update. I have not bothered checking for file opening errors as you already have them in your code, and a real application would need to check more than just EOF for fscanf in order to detect invalid file formatting.</p> <pre><code>#include <stdlib.h> #include <stdio.h> #define bool int #define false 0 #define true !false #define MAX_ACCOUNT_NUMBER 99999 typedef struct { int accountNumber; char accountName[30]; float accountTotal; } ClientRecordType; typedef struct { int accountNumber; char transactionDate[30]; float transactionAmount; } TransactionRecordType; FILE *oldClientFile; FILE *newClientFile; FILE *transactionFile; void getNextClient(FILE *p_clientFile, ClientRecordType *p_clientRecord) { if (EOF == fscanf(p_clientFile, "%d%s%f", &p_clientRecord->accountNumber, &p_clientRecord->accountName, &p_clientRecord->accountTotal)) p_clientRecord->accountNumber = MAX_ACCOUNT_NUMBER; } void getNextTransaction(FILE *p_transactionFile, TransactionRecordType *p_transactionRecord) { if (EOF == fscanf(p_transactionFile, "%d%s%f", &p_transactionRecord->accountNumber, &p_transactionRecord->transactionDate, &p_transactionRecord->transactionAmount)) p_transactionRecord->accountNumber = MAX_ACCOUNT_NUMBER; } void writeUpdatedClientRecord(FILE *p_newClientFile, ClientRecordType *p_clientRecord) { fprintf(p_newClientFile, "%d %s %.2f ", p_clientRecord->accountNumber, p_clientRecord->accountName, p_clientRecord->accountTotal); } bool performTransactionUpdate(FILE *p_oldClientFile, FILE *p_newClientFile, FILE *p_transactionFile) { ClientRecordType clientRecord; TransactionRecordType transactionRecord; getNextClient(p_oldClientFile, &clientRecord); getNextTransaction(p_transactionFile, &transactionRecord); while (MAX_ACCOUNT_NUMBER != clientRecord.accountNumber) { if (clientRecord.accountNumber == transactionRecord.accountNumber) { clientRecord.accountTotal += transactionRecord.transactionAmount; getNextTransaction(p_transactionFile, &transactionRecord); } else if (clientRecord.accountNumber < transactionRecord.accountNumber) { writeUpdatedClientRecord(p_newClientFile, &clientRecord); getNextClient(p_oldClientFile, &clientRecord); } else { return false; } } if (MAX_ACCOUNT_NUMBER != transactionRecord.accountNumber) return false; return true; } int main(int argc, char *argv[]) { oldClientFile = fopen("clients.dat", "r"); newClientFile = fopen("newclients.dat", "w"); transactionFile = fopen("transactions.dat", "r"); if (performTransactionUpdate(oldClientFile, newClientFile, transactionFile)) printf("\nUpdate completed without errors!\n"); else printf("\nUnsorted files or invalid transactions encountered\n"); close(newClientFile); close(oldClientFile); close(transactionFile); return 0; } </code></pre>
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1. POC File updating and creating help
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