### Loop Issue

I need month #1's balance to be zero, but when I run the program, it is 100...Any suggestions?

Here is my code:
 12345678910111213141516171819202122232425262728293031323334353637383940414243 #include using namespace std; int main() { int down_payment, month, cnum; double balance, payment, interest, shortage, total_interest; cout << "How much is your down payment for your car? "; cin >> down_payment; month = 1; balance = 0 ; total_interest = 0; payment = 100; while (balance<=down_payment) { interest = balance * .001; balance = balance + payment + interest ; shortage = down_payment - balance; total_interest += interest; if (balance + payment >= down_payment) { payment = down_payment - balance ; } cout << "\nMONTH: \tBALANCE: \tPAYMENT: \tINTEREST: \tSHORTAGE:" ; cout << "\n" << month << "\t" << balance << "\t\t" << payment << "\t\t" << interest << "\t\t" << shortage ; month ++ ; } cout << "\nTotal number of months needed: " << month ; cout << "\nTotal amount of interest earned: " << total_interest ; cin >> cnum; return 0; }
balance = balance + payment + interest ;

Payment = 100.
Last edited on
thats the thing. Every month the payment is 100, starting from the first month. but the balance of the first month is zero.

how do i get the balance of the first month to be zero and the rest of the months to be "balance = balance + payment + interest" ? thanks
Why not just initialize payment @ 0? And you should probably use a for loop not a while loop...
http://www.cplusplus.com/doc/tutorial/control/
ex:
 123456789101112131415161718192021222324 /* I would initialize them all @ 0... balance=0; payment=0; total_interest=0; month=0; */ for(months=0;balance<=downpayment;months++) //for(initializer;condition;increment)statement; { //Since you calculate your payment with the if statement you can initialize payment @ 0... interest = balance * .001; //You didn't initialize interest, I don't know if that's what you want... balance = balance + payment + interest ; shortage = down_payment - balance; total_interest += interest; if (balance + payment >= down_payment) { payment = down_payment - balance ; } else payment=100; // here's where you could put your 100... cout << "\nMONTH: \tBALANCE: \tPAYMENT: \tINTEREST: \tSHORTAGE:" ; cout << "\n" << month << "\t" << balance << "\t\t" << payment << "\t\t" << interest << "\t\t" << shortage ; // you can get rid of: month ++ ; }

Also what is with cnum? Why input with no output?
Anyways, I probably missed stuff but you get the general idea.

Sean
 how do i get the balance of the first month to be zero and the rest of the months to be "balance = balance + payment + interest" ? thanks

You need to rethink the logic of your operations, so that your reporting of the first month's balance happens before it's adjusted for the first payment.
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