training

Code I wrote during training
git clone git://git.bitsmanent.org/training
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file-matching2.c (2196B)

      1 /* Exercise 11.10
      2  *
      3  * NOTE: i suppose that the records stored to the
      4  *       files are in an ascending order sequence.
      5 */
      6 
      7 #include <stdio.h>
      8 #include <stdlib.h>
      9 
     10 #define SIZE 29
     11 
     12 struct record {
     13    int account;
     14    char name[SIZE];
     15    char address[SIZE];
     16    int phone;
     17    double balance; 
     18    char notes[255];
     19 };
     20 
     21 int main(void)
     22 {
     23    FILE *clients, *trans, *newfile;
     24    struct record cRec, tRec;
     25    int found;
     26 
     27    /* open the clients file */
     28    if( (clients = fopen("oldmast.dat", "r")) == NULL ) {
     29       printf("%s: cannot open the file\n", "oldmast.dat");
     30       exit(-1);
     31    }
     32 
     33    /* open the transactions file */
     34    if( (trans = fopen("trans.dat", "r")) == NULL ) {
     35       printf("%s: cannot open the file\n", "trans.dat");
     36       exit(-1);
     37    }
     38 
     39    /* open the new archive file */
     40    if ( (newfile = fopen("newmast.dat", "w")) == NULL ) {
     41       printf("%s: cannot open the file\n", "newmast.dat");
     42       exit(-1);
     43    }
     44 
     45    /* Read the first record */
     46    fread(&cRec, sizeof(struct record), 1, clients);
     47 
     48    /* loop the clients */
     49    while( !feof(clients) ) {
     50 
     51       fread(&tRec, sizeof(struct record), 1, trans);
     52 
     53       /* check the transactions */
     54       while( !feof(trans) && tRec.account <= cRec.account ) {
     55 	 if(tRec.account == cRec.account) {
     56 	    cRec.balance += tRec.balance;
     57 	 }
     58 	 fread(&tRec, sizeof(struct record), 1, trans);
     59       }
     60       fwrite(&cRec, sizeof(struct record), 1, newfile);
     61 
     62       rewind(trans);
     63       fread(&cRec, sizeof(struct record), 1, clients);
     64    }
     65 
     66    fread(&tRec, sizeof(struct record), 1, trans);
     67 
     68    /* check the mismathed transactions */
     69    while( !feof(trans) ) {
     70 
     71       rewind(clients);
     72       fread(&cRec, sizeof(struct record), 1, clients);
     73 
     74       found = 0;
     75 
     76       /* loop the clients */
     77       while( !feof(clients) && cRec.account <= tRec.account ) {
     78 	 if(cRec.account == tRec.account) {
     79 	    found = 1;
     80 	    break;
     81 	 }
     82          fread(&cRec, sizeof(struct record), 1, clients);
     83       }
     84 
     85       if(!found) {
     86 	 printf("Unmatched transaction record for account number %d\n",
     87 	    tRec.account);
     88       }
     89 
     90       fread(&tRec, sizeof(struct record), 1, trans);
     91    }
     92 
     93    fclose(clients);
     94    fclose(trans);
     95    fclose(newfile);
     96 
     97    return 0;
     98 } /* E0F main */
     99