Computer Science Canada :: View topic

import java.io.*;
class like
{
public static void main(String[]text)
{
double amount;
double interestRate[]=new double[3];
DataInput d = new DataInputStream(System.in);
String txt;
try{
txt=d.readLine();

System.out.println("\n" + "We are offering loans upto $50000 at good rates so if anyone is looking for a loan we are here for you.");
System.out.println("\n" + "How much money do you want to borrow?.");
amount= Double.parseDouble(d.readLine());
if (amount<=10000)
{
System.out.print("\n" + "The interest rate you are borrowing at is ");
System.out.print(interestRate[0]=5);
System.out.println(" %.");
System.out.println((interestRate[0]/=100)+1);
}
else if ((amount>10000) && (amount<=20000))
{
System.out.print("\n" + "The interest rate you are borrowing at is ");
System.out.print(interestRate[1]=10);
System.out.println(" %.");
System.out.println((interestRate[1]/=100)+1);
}
else if ((amount>20000) && (amount<=50000))
{
System.out.print("\n" + "The interest rate you are borrowing at is ");
System.out.print(interestRate[2]=15);
System.out.println(" %.");
System.out.println((interestRate[2]/=100)+1);
}
else
System.out.println("Too much money");

int time1[]=new int[11];
int time=1;
time1[time]=time;

System.out.println("For how long would you like the loan for.");
System.out.println("Your options are 1 year, 2 years, 5 years, or 10 years.");
time= Integer.parseInt(d.readLine());
if (time==1)
{
System.out.print("\n" + "You will have to pay interest for 1 year, compounded monthly, for ");
System.out.print(time1[time]*=12);
System.out.println(" periods.");
}
else if (time==2)
{
System.out.print("\n" + "You will have to pay interest for 2 years, compounded quartly, for ");
System.out.print(time1[time]*=3);
System.out.println(" periods.");
}
else if (time==5)
{
System.out.print("\n" + "You will have to pay interest for 5 years compounded Semi annually, for ");
System.out.print(time1[time]*=2);
System.out.println(" periods.");
}
else if (time==10)
{
System.out.print("\n" + "You will have to pay interest for 10 years, annually, for ");
System.out.print(time1[time]*=1);
System.out.println(" periods.");
}
else
System.out.println("We dont offer that year.");

double amountPayment;

System.out.println("\n" + "How much money will you pay each period?");
amountPayment= Double.parseDouble(d.readLine());
System.out.println("I would like to pay $ " + amountPayment + "\n");
double totalPayment;
double interestPayment=0;
int period=1;

for(int interestPeriod=1; interestPeriod<=time1[time]; interestPeriod++)
{
System.out.println("\nYour interest payment is $" + (interestPayment=amount*interestRate[]));
System.out.print("Your total payment is $");
System.out.println(totalPayment=interestPayment+amountPayment);
System.out.print("You still have to pay $");
System.out.println(amount-=amountPayment);

}
}catch (IOException ignored){}
}
}

Author:	yoursecretninja [ Thu Jun 03, 2010 4:43 pm ]
Post subject:	Re: array help
I just peaked at the stuff pertaining to the interest rate. Why are you using an array for interest rates? You ask the user to choose an amount of money to borrow. The entered amount of money is compared against three ranges of values. For amount within range A you set the value of interestRate at index 0. For amount within range B you set the value of interestRate at index 1. For amount within range C you set the value of interestRate at index 2. moving along to the part just before you perform your calculations in that for loop... You create an integer called interestRate2 and assign it the value of one. You then assign the value of InterestRate at index interestRate2 to the value of interestRate2... do you see what you did there? You then calculate the interest payment as amount * ((the value of interestRate at index interestRate2 / 100) + 1). Does following this logic in plain english, rather than looking at code, help you see why you'll get the wrong answer every time you run the program (assuming the program actually compiles and runs)? Do you see what you are doing when you operate on that array? Do you see how this problem would be much easier if you used an integer to hold the interest rate instead of an array? I hope this is helpful... I'd like to help you understand how to fix this rather than just fixing it for you as this looks like it might be a homework assignment.