英文:
Cannot figure out why loop isn't getting the correct sum
问题
double termSelection = 0.0359;double principal = 325000;double effectiveMonthlyRate = 0.0029695338579054376;double monthlyPayment = 1638.1053796234314;double monthlyInterest = (principal * effectiveMonthlyRate);double monthlyPrincipal = (monthlyPayment - monthlyInterest);double closingBalance = (principal - monthlyPrincipal);int month = 1;double totalPrincipal = 0;double totalInterest = 0;termSelection *= 100;//monthly payment schedule headerSystem.out.println("\n");System.out.printf("%nInterest Rate: %.2f%%", termSelection);System.out.printf("%n%53s", "Monthly Payment Schedule");termSelection /= 100;//monhtly payment schedule bodySystem.out.printf("%n%5s%14s%15s%15s%15s%15s", "Month", "Open Bal", "Payment", "Princ", "Interest", "Closing Bal");do{System.out.printf("%n%5s%14.2f%15.2f%15.2f%15.2f%15.2f", month, principal, monthlyPayment, monthlyPrincipal, monthlyInterest, closingBalance);month++;principal = closingBalance;monthlyInterest = principal * effectiveMonthlyRate;monthlyPrincipal = monthlyPayment - monthlyInterest;closingBalance = principal - monthlyPrincipal;totalPrincipal = totalPrincipal + monthlyPrincipal;totalInterest = totalInterest + monthlyInterest;}while (month <= 12);System.out.println("\n");for (int count = 0; count <= 80; count++){System.out.print('=');}System.out.printf("%n%5s%44.2f%15.2f", "Ttls", totalPrincipal, totalInterest);
英文:
I'm trying to make a mortgage calculator, and for whatever reason it's getting the wrong sum for the principal and the interest. Is it possible that because it's being added up inside of the do-while loop that it gets it wrong? When I run the program it comes up with 8233.68 for the principal and 11423.59 for interest. If you sum them up on a calculator, it should be 8209.30 for principal and 11447.97 for the interest.
double termSelection = 0.0359;double principal = 325000;double effectiveMonthlyRate = 0.0029695338579054376;double monthlyPayment = 1638.1053796234314;double monthlyInterest = (principal * effectiveMonthlyRate);double monthlyPrincipal = (monthlyPayment - monthlyInterest);double closingBalance = (principal - monthlyPrincipal);int month = 1;double totalPrincipal = 0;double totalInterest = 0;termSelection *= 100;//monthly payment schedule headerSystem.out.println("");System.out.printf("%nInterest Rate: %.2f%%", termSelection);System.out.printf("%n%53s", "Monthly Payment Schedule");termSelection /= 100;//monhtly payment schedule bodySystem.out.printf("%n%5s%14s%15s%15s%15s%15s", "Month", "Open Bal", "Payment", "Princ", "Interest", "Closing Bal");do{System.out.printf("%n%5s%14.2f%15.2f%15.2f%15.2f%15.2f", month, principal, monthlyPayment, monthlyPrincipal, monthlyInterest, closingBalance);month++;principal = closingBalance;monthlyInterest = principal * effectiveMonthlyRate;monthlyPrincipal = monthlyPayment - monthlyInterest;closingBalance = principal - monthlyPrincipal;totalPrincipal = totalPrincipal + monthlyPrincipal;totalInterest = totalInterest + monthlyInterest;}while (month <= 12);System.out.println("");for (int count = 0; count <= 80; count++){System.out.print('=');}System.out.printf("%n%5s%44.2f%15.2f", "Ttls", totalPrincipal, totalInterest);
答案1
得分: 1
抱歉，你提供的内容似乎有点混乱。你想要我翻译的部分是什么？请提供需要翻译的具体文本内容。
英文:
The problem is that you are doing calculation before you even enter the loop
double closingBalance = (principal - monthlyPrincipal);
should be
double closingBalance = (principal);
output
Ttls 8209.30 11447.97
答案2
得分: -1
你在循环的第一次迭代中重新计算了monthlyInterest和monthlyPrincipal的初始值，然后将它们添加到总数中。请先将它们添加到总数中，然后再重新计算。
do {System.out.printf("%n%5s%14.2f%15.2f%15.2f%15.2f%15.2f", month, principal, monthlyPayment, monthlyPrincipal, monthlyInterest, closingBalance);principal = closingBalance;totalPrincipal += monthlyPrincipal;totalInterest += monthlyInterest;monthlyInterest = principal * effectiveMonthlyRate;monthlyPrincipal = monthlyPayment - monthlyInterest;closingBalance = principal - monthlyPrincipal;month++;} while (month <= 12);
英文:
You recalculate initial values of monthlyInterest and monthlyPrincipal on first iteration of the loop and then add them to totals. Add them to totals first and then recalculate.
do {System.out.printf("%n%5s%14.2f%15.2f%15.2f%15.2f%15.2f", month, principal, monthlyPayment, monthlyPrincipal, monthlyInterest, closingBalance);principal = closingBalance;totalPrincipal += monthlyPrincipal;totalInterest += monthlyInterest;monthlyInterest = principal * effectiveMonthlyRate;monthlyPrincipal = monthlyPayment - monthlyInterest;closingBalance = principal - monthlyPrincipal;month++;} while (month <= 12);
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