最后两语句的(int)，加了结果有两位小数，不加有很多小数；但是int不是整数型的吗

Question

package programList;
import java.util.Scanner;
public class money {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);

    System.out.print("Enter annual interest rate, eg:7.25% : ");    //输入年利率
    double annualInterestRate = input.nextDouble();

    double monthlyInterestRate = annualInterestRate / 1200 ;

    System.out.print("Enter number of years as an integer, eg:5 : ");   //输入整年数
    int numberOfYears = input.nextInt();

    System.out.print("Enter loan amount,eg:120000.95 : ");  //输入贷款金额
    double loanAmount = input.nextDouble();

    double monthlyPayment = loanAmount * monthlyInterestRate / (1-1 / Math.pow(1+monthlyInterestRate, numberOfYears * 12));
    double totalPayment = monthlyPayment * numberOfYears * 12 ;

    //每月支付金额
    System.out.println("The monthly payment is $" + (int)(monthlyPayment * 100) / 100.0);
    //总付款金额
    System.out.println("The total payment is $" + (int)(totalPayment * 100) / 100.0);
}

}

Answer 1

int型的无论乘除加减float型的（double,long）都会隐式转换为对应的类型
众所周知， 1 是整形，但是1.00是float类型的，所以整形除以一个float，就会发生隐式转化成float类型