Question

嘿，所以我有一些我正在研究的测试程序。

它做什么？ - 它基本上从应付总金额中扣除每月贷款支付，然后将其插入数组，它正在工作但我需要将其格式化为2位小数，我不知道该怎么做，我尝试过使用我找到的方法是

[NSString stringWithFormat: @"%.2lf", tempPaymentHolder]

但它似乎不起作用，这是代码。

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[])
{

    @autoreleasepool {

        //array that would hold the payments
        NSMutableArray * arrayWithPayments = [[NSMutableArray alloc]init];

        //total amount to be paid
        NSMutableString * totalPaymentString = [[NSMutableString alloc]initWithString:@"151.92"];

        //monthly payment
        NSMutableString * monthlyPaymentsString = [[NSMutableString alloc]initWithString:@"12.66"];

        //temp storage for passing values into array
        NSMutableString * tempPaymentStringHolder = [[NSMutableString alloc]init];
        tempPaymentStringHolder = [NSString stringWithFormat:@"%@",totalPaymentString];

        //doubles so I can calculate
        int numberOfMonths = 12;
        double monthlyPayments = [monthlyPaymentsString doubleValue];
        double totalPayment = [totalPaymentString doubleValue];
        double tempPaymentHolder = totalPayment;


        for (int i = 0; i <= numberOfMonths; i++) 
        {
            [arrayWithPayments addObject:tempPaymentStringHolder];
            tempPaymentHolder = totalPayment - monthlyPayments;
            totalPayment = tempPaymentHolder;
            tempPaymentStringHolder = [NSString stringWithFormat: @"%.2lf", tempPaymentHolder];
        }

        for (id obj in arrayWithPayments)
        {
            NSLog(@"%@",obj);
        }


    }
    return 0;
}

感谢任何帮助。

非常感谢你的时间。

Answer 1

结帐NSDecimalNumber：

NSMutableArray *arrayOfPayments = [[NSMutableArray alloc]init];

//total amount to be paid
NSDecimalNumber * totalPayment = [NSDecimalNumber decimalNumberWithString:@"151.92"];

//monthly payment
NSDecimalNumber * monthlyPayments = [NSDecimalNumber decimalNumberWithString:@"12.66"];

//temp storage for passing values into array
NSDecimalNumber* tempPaymentHolder = [totalPayment copy];

//variables so I can calculate
int numberOfMonths = 12;


for (int i = 0; i <= numberOfMonths; i++) 
{
    [arrayOfPayments addObject:tempPaymentHolder];
    tempPaymentHolder = [totalPayment decimalNumberBySubtracting:monthlyPayments];
    totalPayment = [tempPaymentHolder copy];
}

NSNumberFormatter *formatter = [NSNumberFormatter new];
[formatter setNumberStyle:NSNumberFormatterCurrencyStyle];

for (NSDecimalNumber *obj in arrayOfPayments)
{
    NSLog(@"%@", [formatter stringFromNumber:obj]);
}

输出：

$ 151.92
  $ 139.26
  $ 126.60
  $ 113.94
  $ 101.28
  $ 88.62
  $ 75.96
  $ 63.30
  $ 50.64
  $ 37.98
  $ 25.32
  $ 12.66
  $ 0.00包装

请务必记住将变量复制到通常分配它们的位置，因为您在处理对象而不是原语！

在添加到数组之前格式化为2位小数

1 个答案: