程式碼：

import java.util.Scanner;

public class a248_新手訓練_陣列應用_Math_Round {

public static void main(String[] args) {

Scanner input = new Scanner(System.in);

String str1;

String[] sp;

int a, b, N;

int sum;

int divisor;

String output;

while(input.hasNext()) {

str1 = input.nextLine();

sp = str1.split(" ");

a = Integer.parseInt(sp[0]);

b = Integer.parseInt(sp[1]);

N = Integer.parseInt(sp[2]);

output = "";

sum = a / b;

output += Integer.toString(sum) + ".";

for(int i = 0; i < N; i++) {

if(a % b == 0) {

output += "0";

continue;

}

divisor = a % b;

a = divisor * 10;

output += Integer.toString(a / b);

}

System.out.println(output);

}

}

}