我正在为我的第一个Java类解决名为“代数导师”的项目挑战。
程序应该能够输出一个问题，以确定是否要对公式
m中的b或y = mx + b或y求解。一旦其中一个被一个数字选中：“选择1来解决
Y，2来解决M，3来解决B和4退出。”它应该为您提供解决公式的输出。
我正在该项目的第3部分中工作：
更新程序，以便每个问题类型模式都会反复询问问题，直到用户连续获得3个正确答案。
如果在特定模式下尝试超过3个问题，则程序应提供有关如何解决此类问题的提示。
学生连续正确回答了3个问题后，应显示总分（正确回答的问题数除以尝试的问题总数），然后再次显示菜单。
因此，我对如何放置从0开始的计数器感到困惑，每次用户正确回答时，计数器将被添加1，如果计数器连续3退出或退出则退出如果用户答案不正确，则为0。
我将提供我的代码，让我感到困惑的是，如何在if语句内进行一个while循环，然后在计数时进行另一个while循环，这让我感到困惑，但是一旦您看到我的代码，您就会看到我在在谈论。
所以我知道我可以这样放置一个柜台：
int counter = 0;
while (counter < 4)
if statement here
counter ++;
else
counter = 0;
import java.util.Scanner;
class AlgebraTutor {
public static void main(String[] arg) {
double min_value = -100;
double max_value = 100;
double m_value = generate_random(max_value, min_value);
double x_value = generate_random(max_value, min_value);
double b_value = generate_random(max_value, min_value);
double y_value = generate_random(max_value, min_value);
Scanner user_input = new Scanner(System.in);
int user_answer_int = 0;
while ((user_answer_int < 4) && (user_answer_int >= 0)) {
System.out.println("Select 1 to Solve for Y, 2 to Solve for M, 3 to Solve for B and 4 to quit. ");
user_answer_int = user_input.nextInt();
if (user_answer_int == 1) {
check_answer_for_y(m_value, x_value, b_value);
}
else if (user_answer_int == 2) {
check_answer_for_m(x_value, y_value, b_value);
}
else if (user_answer_int == 3) {
check_answer_for_b(m_value, x_value, y_value);
}
else {
System.out.println("You are done");
}
}
}
static void check_answer_for_m(double x_value, double y_value, double b_value) {
System.out.println("Solve For M Problem ");
System.out.println("Given: ");
System.out.println("b = " + b_value);
System.out.println("x = " + x_value);
System.out.println("y = " + y_value);
System.out.print("What is the value of m? ");
Scanner user_input = new Scanner(System.in);
String user_answer_m = "";
user_answer_m = user_input.next();
int user_answer_int = Integer.parseInt(user_answer_m);
int correct_answer_m = (((int)y_value - (int)b_value) / (int)x_value);
if (user_answer_int == correct_answer_m){
System.out.println("You are correct!");
} else {
System.out.print("Sorry, that is incorrect. ");
System.out.println("The answer is " + correct_answer_m);
}
}
static void check_answer_for_b(double m_value, double x_value, double y_value) {
System.out.println("Solve For B Problem ");
System.out.println("Given: ");
System.out.println("m = " + m_value);
System.out.println("x = " + x_value);
System.out.println("y = " + y_value);
System.out.print("What is the value of b? ");
Scanner user_input = new Scanner(System.in);
String user_answer_b = "";
user_answer_b = user_input.next();
int user_answer_int = Integer.parseInt(user_answer_b);
int correct_answer_b = ((int)y_value - ((int)m_value * (int)x_value));
if (user_answer_int == correct_answer_b){
System.out.println("You are correct!");
} else {
System.out.print("Sorry, that is incorrect. ");
System.out.println("The answer is " + correct_answer_b);
}
}
static void check_answer_for_y(double m_value, double x_value, double b_value) {
System.out.println("Solve For Y Problem ");
System.out.println("Given: ");
System.out.println("m = " + m_value);
System.out.println("x = " + x_value);
System.out.println("b = " + b_value);
System.out.print("What is the value of y? ");
Scanner user_input = new Scanner(System.in);
String user_answer_y = "";
user_answer_y = user_input.next();
int user_answer_int = Integer.parseInt(user_answer_y);
int correct_answer_y = (int) m_value * (int) x_value + (int) b_value;
if (user_answer_int == correct_answer_y) {
System.out.println("You are correct!");
} else {
System.out.print("Sorry, that is incorrect. ");
System.out.println("The answer is " + correct_answer_y);
}
}
static int generate_random(double max_value, double min_value) {
return (int) ((int) (Math.random() * ((max_value - min_value)+ 1)) + min_value);
}
}
我在其中输入用户输入号码的while循环的地方 根据数字，如果if语句跳入 我可以在哪里放置计数器以开始并捕获所有if语句，具体取决于用户选择的号码，然后如果用户连续3个正确，则程序应回到主要问题。我可以在已有的循环中进行另一次while循环吗？还是应该将其放在每个if语句中？
答案 0 :(得分：-1)
将每个循环都放在此处
else if (user_answer_int == 3) {
check_answer_for_b(m_value, x_value, y_value);
}
将主要功能更改为此。
public static void main(String[] arg) {
double min_value = -100;
double max_value = 100;
double m_value = generate_random(max_value, min_value);
double x_value = generate_random(max_value, min_value);
double b_value = generate_random(max_value, min_value);
double y_value = generate_random(max_value, min_value);
Scanner user_input = new Scanner(System.in);
int user_answer_int = 0;
while ((user_answer_int < 4) && (user_answer_int >= 0)) {
System.out.println("Select 1 to Solve for Y, 2 to Solve for M, 3 to Solve for B and 4 to quit. ");
user_answer_int = user_input.nextInt();
int i = 0;
if (user_answer_int == 1) {
while (i < 3){
if (check_answer_for_y(generate_random(max_value, min_value), generate_random(max_value, min_value), generate_random(max_value, min_value))) {
i++;
}
else {
i = 0;
}
}
}
else if (user_answer_int == 2) {
while (i < 3){
if (check_answer_for_m(generate_random(max_value, min_value), generate_random(max_value, min_value), generate_random(max_value, min_value))) {
i++;
}
else {
i = 0;
}
}
}
else if (user_answer_int == 3) {
while (i < 3){
if (check_answer_for_b(generate_random(max_value, min_value), generate_random(max_value, min_value), generate_random(max_value, min_value))) {
i++;
}
else {
i = 0;
}
}
}
else {
System.out.println("You are done");
}
}
}
static boolean check_answer_for_m(double x_value, double y_value, double b_value) {
System.out.println("Solve For M Problem ");
System.out.println("Given: ");
System.out.println("b = " + b_value);
System.out.println("x = " + x_value);
System.out.println("y = " + y_value);
System.out.print("What is the value of m? ");
Scanner user_input = new Scanner(System.in);
String user_answer_m = "";
user_answer_m = user_input.next();
int user_answer_int = Integer.parseInt(user_answer_m);
int correct_answer_m = (((int)y_value - (int)b_value) / (int)x_value);
if (user_answer_int == correct_answer_m){
System.out.println("You are correct!");
return true;
} else {
System.out.print("Sorry, that is incorrect. ");
System.out.println("The answer is " + correct_answer_m);
return false;
}
}
static boolean check_answer_for_b(double m_value, double x_value, double y_value) {
System.out.println("Solve For B Problem ");
System.out.println("Given: ");
System.out.println("m = " + m_value);
System.out.println("x = " + x_value);
System.out.println("y = " + y_value);
System.out.print("What is the value of b? ");
Scanner user_input = new Scanner(System.in);
String user_answer_b = "";
user_answer_b = user_input.next();
int user_answer_int = Integer.parseInt(user_answer_b);
int correct_answer_b = ((int)y_value - ((int)m_value * (int)x_value));
if (user_answer_int == correct_answer_b){
System.out.println("You are correct!");
return true;
} else {
System.out.print("Sorry, that is incorrect. ");
System.out.println("The answer is " + correct_answer_b);
return false;
}
}
static boolean check_answer_for_y(double m_value, double x_value, double b_value) {
System.out.println("Solve For Y Problem ");
System.out.println("Given: ");
System.out.println("m = " + m_value);
System.out.println("x = " + x_value);
System.out.println("b = " + b_value);
System.out.print("What is the value of y? ");
Scanner user_input = new Scanner(System.in);
String user_answer_y = "";
user_answer_y = user_input.next();
int user_answer_int = Integer.parseInt(user_answer_y);
int correct_answer_y = (int) m_value * (int) x_value + (int) b_value;
if (user_answer_int == correct_answer_y) {
System.out.println("You are correct!");
return true;
} else {
System.out.print("Sorry, that is incorrect. ");
System.out.println("The answer is " + correct_answer_y);
return false;
}
}
static int generate_random(double max_value, double min_value) {
return (int) ((int) (Math.random() * ((max_value - min_value)+ 1)) + min_value);
}