NEW EDIT
初学者Java学生。我有一个任务是做一个简单的Java控制台应用程序来监控一家四口猴子的食物消耗。 申请要求是：
2维4x7阵列;一周7天的4只猴子
全家猴子每天平均吃的食物。
每只猴子每周吃的平均食物量。
任何一只猴子每周最少食用的食物。
任何一只猴子每周食用的最大食物量。
没有负数。
用户输入1到50磅。
到目前为止，我每周都有平均食物摄入量，单个猴子部分的食物摄入量最少和最少。当我到达他们时，我将继续工作。我想让代码尽可能简单。
但是，我被困在用户输入验证部分。我想能够验证除1到50之间的正整数以外的任何东西。当运行应用程序时，编译器会发出＆＃34;找不到符号：变量col。 Col是数组中的列。我不确定我做错了什么。我很确定这是非常简单的事情，但我正在撞墙，因为我无法看到它可能是什么。
任何人都可以帮我看看我做错了什么或者指出了我正确的方向吗？ 非常感谢你！
*****************************新编辑：*************** ********************
我有新的代码可行，但每只猴子的每周平均消费量不正确。逻辑看起来似乎没问题。 我该怎么做才能纠正这个问题？
新代码：
package monkeybusiness;
import java.util.Scanner;
import java.util.InputMismatchException;
public class MonkeyBusiness {
public static void main(String[] args) {
System.out.println("Welcome to MonkeyBusiness!");
System.out.println("Feed Four Monkeys.\n");
// Array - four monkeys (row) and seven days (col)
int monkeyarray[][] = new int[4][7];
//User input and validation
Scanner scanner = new Scanner(System.in);
for (int row = 0; row < 4; row++) {
for (int col = 0; col < 7; col++) {
boolean inputValidate = false;
int number = 0;
do {
System.out.println("Enter food amount (1-50) for Monkeys "
+ (row + 1) + " on Day " + (col + 1));
try {
number = scanner.nextInt();
if (number >= 1 && number <= 50) {
inputValidate = true;
} else {
System.out.println("Entry not in range. ");
scanner.nextLine();
}
} catch (InputMismatchException exception) {
System.out.println("Entry not a number.");
scanner.nextLine();
}
} while (!(inputValidate));
monkeyarray[row][col] = number;
}
}
// Calculate total daily average for family
int average;
int[] perday = new int[]{0, 0, 0, 0, 0, 0, 0};
for (int col = 0; col < 7; col++) {
for (int row = 0; row < 4; row++) {
perday[col] += monkeyarray[row][col];
}
}
int sum = 0;
for (int row = 0; row < 7; row++) {
sum += perday[row];
}
average = sum / 28;
System.out.println("");
System.out.println("*************************************************");
System.out.println("Daily average amount for "
+ "whole family is: " + average);
// Calculate average weekly amount of food for each monkey
// Monkey# 1
int avg1;
int sum1 = 0;
int[] perweek1 = new int[]{0, 0, 0, 0, 0, 0, 0};
for (int col = 0; col < 7; col++) {
for (int row = 0; row < 4; row++) {
perweek1[col] += monkeyarray[row][col];
}
}
for (int row = 0; row < 7; row++) {
sum1 += perweek1[row];
}
System.out.println("Monkey# 1: " + sum1);
avg1 = sum1 / 7;
System.out.println("Weekly average amount for "
+ "Monkey# 1 is: " + avg1);
// Monkey# 2
int avg2;
int sum2 = 0;
int[] perweek2 = new int[]{0, 0, 0, 0, 0, 0, 0};
for (int col = 0; col < 7; col++) {
for (int row = 0; row < 4; row++) {
perweek2[col] += monkeyarray[row][col];
}
}
for (int row = 0; row < 7; row++) {
sum2 += perweek2[row];
}
System.out.println("Monkey# 2: " + sum2);
avg2 = sum2 / 7;
System.out.println("Weekly average amount for "
+ "Monkey# 2 is: " + avg2);
// Monkey# 3
int avg3;
int sum3 = 0;
int[] perweek3 = new int[]{0, 0, 0, 0, 0, 0, 0};
for (int col = 0; col < 7; col++) {
for (int row = 0; row < 4; row++) {
perweek3[col] += monkeyarray[row][col];
}
}
for (int row = 0; row < 7; row++) {
sum3 += perweek3[row];
}
System.out.println("Monkey# 3: " + sum3);
avg3 = sum3 / 7;
System.out.println("Weekly average amount for "
+ "Monkey# 3 is: " + avg3);
// Monkey# 4
int avg4;
int sum4 = 0;
int[] perweek4 = new int[]{0, 0, 0, 0, 0, 0, 0};
for (int col = 0; col < 7; col++) {
for (int row = 0; row < 4; row++) {
perweek4[col] += monkeyarray[row][col];
}
}
for (int row = 0; row < 7; row++) {
sum4 += perweek4[row];
}
System.out.println("Monkey# 4: " + sum4);
avg4 = sum4 / 7;
System.out.println("Weekly average amount for "
+ "Monkey# 4 is: " + avg4);
// Calculate least amount of food for monkey
int minimum = monkeyarray[0][0];
for (int row = 0; row < 4; row++) {
for (int col = 0; col < 7; col++) {
if (minimum > monkeyarray[row][col]) {
minimum = monkeyarray[row][col];
}
}
}
System.out.println("Least amount of food by any monkey: " + minimum);
// Calculate most amount of food for monkey
int maximum = monkeyarray[0][0];
for (int row = 0; row < 4; row++) {
for (int col = 0; col < 7; col++) {
if (maximum < monkeyarray[row][col]) {
maximum = monkeyarray[row][col];
}
}
}
System.out.println("Most amount of food by any monkey: " + maximum);
System.out.println("*************************************************");
System.out.println("");
}
}
答案 0 :(得分：0)
首先是＆＃39; col＆＃39;不在for循环的范围内，在该循环中，您已经编写了验证用户输入0到50之间值的条件。
if (val > 0 && val <= 50) {
for (int col = 0; col < 7; col++) {
monkeyarray[row][col] = input.nextInt();
}
}
如果你想要col，那么你可以有另一个for循环，如上面代码所示