"C Language and Programming" project 2-15: Modular Simple banking system design

Problem Description:

https://edu.csdn.net/course/play/456/4808

Banking system. CPP: Defines the entry point of the console application. #include "stdafx.h" #include <stdlib.h> #pragma warning (disable:4996) int passtest (); void ibalance (); void Withdraw (); void deposit (); void Passchange (); int main () {int ichoice,testresult;printf ("Welcome to the grass Mud horse bank \ n"); TestResult = Passtest (); while (TestResult) {printf ("\ n");p rintf ("1. Check balance \ n");p rintf ("2. Withdrawals \ \");p rintf ("3. Deposit \ n"); printf ("4. Change password \ n");p rintf ("0. exit \ n");p rintf ("Please Enter (0-4):") scanf ("%d", &ichoice); switch (ichoice) {case 1:ibalance (); Break Case 2:withdraw (); Break;case 3:deposit (); Break;case 4:passchange (); Break;default:break;}    if (Ichoice = = 0) {break;}} return 0;} int Passtest () {printf ("Please enter 6-digit password:"), while (1) {int pass, passstored, Itry (1), righttime (0); File *FP;FP = fopen ("D:\\code\\pass.dat", "R"), if (fp = = NULL) {printf ("file cannot open!"); Exit (0);} for (int i = 0; i < 6; i++) {scanf_s ("%1d", &pass), fscanf (FP, "%1d", &passstored); if (pass = = passstored) {Rightt ime++;}} if (Righttime = = 6) {fclose (FP); return 1;break;}else if (itry<3) {itry++;p rintf ("Password error accumulated%d times, please re-enter:", itry-1); continue;} else{printf ("Password error accumulated%d times, system terminated \ n", itry); fclose (FP); return 0;break;}} void Ibalance () {double balance; File *FP;FP = fopen ("D:\\code\\balance.dat", "R"), if (fp = = NULL) {printf ("file cannot open!"); Exit (0);} FSCANF (FP, "%lf", &balance);p rintf ("Balance:%.2lf\n\n", balance); fclose (FP);} void Withdraw () {Double cash, balance, diff;printf ("Please enter the amount:"); scanf ("%lf", &cash); File *FP;FP = fopen ("D:\\code\\balance.dat", "R"), if (fp = = NULL) {printf ("file cannot open!"); Exit (0);} FSCANF (FP, "%lf", &balance); if (balance>cash) {diff = balance-cash;fclose (fp); fp = fopen ("D:\\code\\balance.dat "," w "); fprintf (FP,"%lf ", diff), Fclose (fp), fp = fopen (" D:\\code\\balance.dat "," R "); FSCANF (FP,"%lf ", &balance); printf ("Current balance:%.2lf\n\n", balance); fclose (FP);} else{printf ("The withdrawal amount is greater than the balance, withdrawals fail \ n"); fclose (FP);}} void deposit () {Double cash, balance, diff;printf ("Please enter Deposit Amount:"), scanf ("%lf", &cash); FILE *FP;FP = fopen ("D:\\code\\balance.dat", "R "), if (fp = = NULL) {printf (" File cannot open! "); Exit (0);} FSCANF (FP, "%lf", &balance);d iff = balance + cash;fclose (fp), fp = fopen ("D:\\code\\balance.dat", "w"), if (fp = = NULL) { printf ("File cannot open!"); Exit (0);} fprintf (FP, "%lf", diff), Fclose (fp), fp = fopen ("D:\\code\\balance.dat", "R"), if (fp = = NULL) {printf ("File cannot open!") ; exit (0);} FSCANF (FP, "%lf", &balance);p rintf ("Current balance:%.2lf\n", balance); fclose (FP);} void Passchange () {while (1) {int pass, pass2;printf ("Please enter new password:"), scanf ("%d", &pass); if (pass>=100000 && Pass <=999999) {printf ("Please enter new password:"), scanf ("%d", &pass2), if (pass = = Pass2) {FILE *FP;FP = fopen ("d:\\code\\ Pass.dat "," W "), fprintf (FP,"%d ", pass), fclose (FP);p rintf (" Password modification succeeded \ n ");} break;} else{printf ("The number of passwords is insufficient, please fill 6 bits \ n"); continue;}}

　　

Feelings:

Data written to the hard disk (such as writing a text document) appears to be in effect after fclose

such as the withdrawal after the "current balance", must be written

fp = fopen ("D:\\code\\balance.dat", "W"), fprintf (FP, "%lf", diff), Fclose (fp), fp = fopen ("D:\\code\\balance.dat", "R"); FSCANF (FP, "%lf", &balance);p rintf ("Current balance:%.2lf\n\n", balance); fclose (FP);

　　

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"C Language and Programming" project 2-15: Modular Simple banking system design