我想問一下，當(dāng)循環(huán)開始并重新開始時(shí)，字符串變量名稱將增加 1。這個(gè)程序應(yīng)該問你要寫多少患者。如果你為前任寫作。10，然后循環(huán)將進(jìn)行 10 次，它會(huì)詢問我想要的所有這些信息，然后將它們添加到我已經(jīng)創(chuàng)建的名為 BMI 的數(shù)組中。整個(gè)程序應(yīng)該為您打印一張表格，其中包含姓名、以米為單位的身高、以公斤為單位的體重、您計(jì)算出的 BMI，然后是您 ATM 處于何種 BMI 狀態(tài)的文本。問題是我該怎么做？我剛開始學(xué)習(xí)數(shù)組之類的東西，我的老師給我布置了這個(gè)作業(yè)。我不認(rèn)為這個(gè)作業(yè)很難，只是很難理解該做什么。我已經(jīng)嘗試過的事情是用 String 創(chuàng)建一個(gè) for 循環(huán)，名為 name 是這樣的：String name(); 但這顯然行不通。import java.util.Scanner;class Pacient { public static void main(String args[]){ int pole; Scanner input = new Scanner(System.in); String pacient; System.out.print("Zadej kolik bude pacientu: "); //How many patients do you want? For ex. 10 pacient = input.nextLine(); input.nextLine(); pole = Integer.parseInt(pacient); String[][] bmi = new String[4][pole]; //This is supposed to make an array with my patients. double vaha; //weight double vyska; //height String jmeno; //name double telo1, telo2; //body for calc. String vysledek; //result int i,x=0,j, pa=0, k=0; //some variables bmi[0][0] = "Jmeno"; //First line of final table NAME bmi[0][1] = "Vaha"; // WEIGHT bmi[0][2] = "Vyska"; //HEIGHT bmi[0][3] = "BMI"; //BMI based on calc. bmi[0][4] = "Text"; //Final result for(int y=1;y<pole;y++){ pa++; x++; atm 程序大部分時(shí)間只是打印 NULL NULL NULL NULL，它與患者編號(hào)不匹配。如何將所有這些代碼添加到 for 循環(huán)并使其自動(dòng)將 int 和 double 轉(zhuǎn)換為字符串，然后正確打印它們并將它們分配給 BMI 數(shù)組。如果您有任何進(jìn)一步的問題，請(qǐng)隨時(shí)詢問。
2 回答
波斯汪
TA貢獻(xiàn)1811條經(jīng)驗(yàn) 獲得超4個(gè)贊
我已經(jīng)糾正了代碼中的問題。一切都在評(píng)論中逐步解釋。為了我的理解，我已經(jīng)用英文轉(zhuǎn)換了變量名。如果您有任何疑問。請(qǐng)問。
import java.util.Scanner;
class Pacient {
private static Scanner input;
public static void main(String args[]) {
int numberOfPatients; // Variables that saves number of patient
// Asking user the number of patients
input = new Scanner(System.in);
System.out.print("How many patients do you want?: ");
// I have change this to nextInt
// From javadoc "Scans the next token of the input as an int"
// It is essentially next() + parseInt()
numberOfPatients = input.nextInt();
// nextInt() does not move cursor to next line
// using nextLine() here would move it to next line and close
// previous line otherwise it creates issue when you will use next/nextLine again
input.nextLine();
// String[][] array = new String[Rows][Columns];
// For each patient there is a row. Since in the code there is header
// as well that's why we need numberOfPatients + 1
String[][] bmi = new String[numberOfPatients + 1][5];
// All corresponding columns
bmi[0][0] = "Name"; // First line of final table NAME
bmi[0][1] = "Weight"; // WEIGHT
bmi[0][2] = "Height"; // HEIGHT
bmi[0][3] = "BMI"; // BMI based on calc.
bmi[0][4] = "Result"; // Final result
// Starting from 1. Skipping header
for (int y = 1; y <= numberOfPatients; y++) {
// Using y instead of an int. This way the loop will
// automatically move to next row
// Instead of saving it to variable and then to array
// I am saving it directly
System.out.print("Enter your first name: ");
bmi[y][0] = input.nextLine();
System.out.print("Enter your weight in Kg: ");
bmi[y][1] = input.nextLine();
System.out.print("Enter your height in m: ");
bmi[y][2] = input.nextLine();
// Using the information from above to calculate BMI
// Basically I am storing and calculating at the same time
// parseDouble converts String into double
// Math.pow(a,b) is powber function. a is base and b is exponent
double weight = Double.parseDouble(bmi[y][1]);
double heightSquare = Math.pow(Double.parseDouble(bmi[y][2]), 2);
double bmiCalculated = weight / heightSquare;
// Based on BMI assigning result in result column
bmi[y][3] = bmiCalculated + "";
if (bmiCalculated < 18.5) {
bmi[y][4] = "You are underweight";
} else if (bmiCalculated > 18.5 && bmiCalculated < 25) {
bmi[y][4] = "You are normal";
} else if (bmiCalculated > 25 && bmiCalculated < 30) {
bmi[y][4] = "You are overweight";
} else {
bmi[y][4] = "You are obese";
}
System.out.println("Your information has been saved successfully!");
}
System.out.println("--------------------------------------------------");
// In java 2D arrays are multiple 1D array stacked on each other
// bmi.length gives the number of rows
// Basically you iterate through each row and print each individual row
// like 1D array
for (int i = 0; i < bmi.length; i++) {
// bmi[i] gives ith row. Which is 1D array. So you can print it like normal array
for (int j = 0; j < bmi[i].length; j++)
System.out.print(bmi[i][j] + " ");
System.out.println();
}
System.out.println("--------------------------------------------------");
}
}
寶慕林4294392
TA貢獻(xiàn)2021條經(jīng)驗(yàn) 獲得超8個(gè)贊
您的數(shù)組聲明和實(shí)現(xiàn)是沖突的。您已經(jīng)固定了第一個(gè)維度并保留了第二個(gè)變量。但是您使用的好像第一個(gè)是可變的，第二個(gè)是固定的。
你應(yīng)該像這樣聲明你的數(shù)組
String[][] bmi = new String[pole+1][4];
pole+1因?yàn)槟鷮⒌谝恍杏米鞅砀駱?biāo)題
你的第一個(gè)循環(huán)應(yīng)該是這樣的
for(int y = 1; y < pole+1; y++){
for(int z = 0; z < 4; z++){
String data="ask user for data";
bmi[y][z] = data; //similar for all
}
}
您的輸出for循環(huán)也將如上所示。
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