C++ class bank account problem

#include<stdio.h>
#include<conio.h>
#include<iostream.h>
#include<stdlib.h>
class bank
{
private:
double a1,a2,sa,cu;
char ac,c,s;
public:
bank()
{
sa=0;
cu=0;
}
void deposit(double amount, char account);
void withdraw(double amount, char account);
void print_balances();
};
void bank::deposit(double amount1, char account)
{
a1=amount1,
ac=account;
if (ac=='s')
{
sa=sa+a1;

}
else if(ac=='c')
{
cu=cu+a1;
}
}
void bank::withdraw(double amount2, char account)
{
a2=amount2,
ac=account;
if (ac=='s')
{
sa=sa-a2;
}
else if(ac=='c')
{
cu=cu-a2;
}
}
void bank::print_balances()
{
cout<<"\nthe money in the savings account is: "<<sa;
cout<<"\nthe money in the current  account is: "<<cu;
}
main()
{
char account;
double amount1,amount2;
int l;
clrscr();
bank b;
do
{

cout<<"\nenter your choice";
cout<<"\n1.deposit";
cout<<"\n2. withdraw";
cout<<"\n3.print balances";
cout<<"\n4.exit";
cout<<"\n";
cin>>l;
switch(l)
{
case 1:
cout<<"\nenter account type: ";
cin>>account;
cout<<"\nenter amount to be deposited :" ;
cin>>amount1;
b.deposit(amount1, account);
break;
case 2:
cout<<"\nenter account type: ";
cin>>account;
cout<<"\nenter amount to be withdrawn :" ;
cin>>amount2;
b.deposit(amount2, account);
break;
case 3:
b.print_balances();
break;
case 4:
cout<<"\nthanx ";

}
}while(l!=4);
getch(); 
}

/* now, when I use the void withdraw(double amount, char account); function and withdraw the money, instead of decreasing, the money increases. suppose I have deposited 5 in my savings account. After that I withdraw 5 from my account, the money in the savings account should be 0 but it is 10, i.e instead of decreasing 5 in my account, it increases. */