Thread: bank program not subtracting from account when i choose withdraw

i have created a bank program with a do while loop switch statement and functions. everything works except when i choose to withdraw it isnt subtracting instead its giving me my account balance without taking out the withdrawal can anyone suggest why?

Code:

 #include <stdio.h>

            char displaymenu();
            float getdeposit(float balance);
            float  getwithdrawal(float balance);
            void displaybalance(float );


               int main()
            {

                char  choice;
                char  transaction='y';
                float deposit=0;
                float withdrawal;
                float balance;
              


              do  {
                choice=displaymenu();    
            


                 switch (choice)
               {
                   
                     
                    case 'd':case 'D':
                       
                       balance=getdeposit(balance);  
                        break;

                     case 'w':case 'W':
                               withdrawal=getwithdrawal(balance); 
                             break;
                    
                       case 'b':case 'B':
                         printf("Checking your account balance\n");
                         displaybalance(balance);
                         break;

                     case 'q':case 'Q':
                       printf("Quit\n");
                       printf("Thankyou");
                        break;

                       default:
                       printf("Invalid Choice\n");
                   
                   
                   
                   
                   
                   
               }
                printf("\n\n\n DO U WISH TO HAVE ANOTHER TRANSCATION?(y/n): \n");
                           scanf(" %c",&transaction);
               
                   }while
               
                  (transaction == 'y'|| transaction == 'Y');
               
               
                return 0;
             }
             
             char displaymenu()
             {
                 
                     char choice;



                      printf("Welcome to Federal Credit Union!\n");
                      printf("Please select from the following menu\n");
                      printf("d. Make a deposit\n");
                      printf("w. Make a withdrawal\n");
                      printf("b. check balance\n");
                      printf("q. Quit\n");
                      scanf ("\n%c",&choice);
                      return choice;
                 
                 
             
             }
             
              float getdeposit(float balance)
             {
                 
                 float deposit;
                      printf("How much would you like to deposit?\n");
                     scanf ("%f",&deposit);
                    balance=deposit+balance;
                    return balance;
                 
             }
             float  getwithdrawal(float balance)
             {
                 
                   float withdrawal;
                  printf("How much would you like to withdraw?\n");
                  scanf ("%f",&withdrawal);
                   balance=balance-withdrawal;
                   return balance;
                 
             }
            void displaybalance(float balance)
             {
                  printf("Your balance is %.2f\n",balance);
                 
             }