C Program to implement banking system<

C Program to implement banking system using switch case

This c program reads the deposit, withdraw amounts and computes the interest and balance based on the user inputs and selected operations sequences.

This c program uses switch case to handle different logics like deposit, withdraw, calculate interest and checking balance etc..

While loop is used to run the program indefinitely till user manually quit the program.

#include<stdio.h>                                                              
                                                                                
void main()                                                                     
{                                                                               
 int balance=0, deposit, withdraw;                                              
 float ci;                                                                      
 char op;                                                                       
                                                                                
 while(1)                                                                       
 {                                                                              
  printf("\nBanking System");                                                   
  printf("\n................");                                                 
  printf("\nD ->Deposit");                                                     
  printf("\nW ->Withdraw");                                                    
  printf("\nB ->Balance");                                                     
  printf("\nI ->Interest");                                                    
  printf("\nQ ->Quit");                                                        
  printf("\nEnter operation: ");                                                
  scanf(" %c", &op);                                                            
  switch(op)                                                                    
  {                                                                             
   case 'D':                                                                    
     printf("\nEnter deposit amount: ");                                        
     scanf("%d", &deposit);                                                     
     balance += deposit;                                                        
     break;                                                                     
   case 'W':                                                                    
     printf("\nEnter withdraw amount: ");                                       
     scanf("%d", &withdraw);                                                    
     balance -= withdraw;                                                       
     break;                                                                     
   case 'B':                                                                    
     printf("Balance: %d", balance);                                            
     break;                                                                     
   case 'I':                                                                    
     ci = (float)balance*4/100;                                                 
     balance += ci;                                                             
     printf("\nInterest: %f", ci);                                              
     break;                                                                     
   case 'Q':                                                                    
     return;                                                                    
   default:                                                                     
     printf("Invalid Operation!");                                              
  }                                                                             
 }                                                                              
} 

Output:

$ cc banking-system.c 
$ ./a.out 

Banking System
................
D ->Deposit
W ->Withdraw
B ->Balance
I ->Interest
Q ->Quit
Enter operation: D

Enter deposit amount: 70000

Banking System
................
D ->Deposit
W ->Withdraw
B ->Balance
I ->Interest
Q ->Quit
Enter operation: B
Balance: 70000
Banking System
................
D ->Deposit
W ->Withdraw
B ->Balance
I ->Interest
Q ->Quit
Enter operation: W

Enter withdraw amount: 25000

Banking System
................
D ->Deposit
W ->Withdraw
B ->Balance
I ->Interest
Q ->Quit
Enter operation: B
Balance: 45000
Banking System
................
D ->Deposit
W ->Withdraw
B ->Balance
I ->Interest
Q ->Quit
Enter operation: I

Interest: 1800.000000
Banking System
................
D ->Deposit
W ->Withdraw
B ->Balance
I ->Interest
Q ->Quit
Enter operation: B
Balance: 46800
Banking System
................
D ->Deposit
W ->Withdraw
B ->Balance
I ->Interest
Q ->Quit
Enter operation: Q

$