[英]How to create a program that allows user to decide the number of Scanner input and then divides Scanners into arrays of positive and negative numbers?
[英]How can I make my user aware of how many numbers they input whether it was negative or positive
到目前為止,我有這個程序,它已經非常接近我想要的了。 但是我試圖找出一種方法,在用戶輸入所有他/她的號碼后,他可以知道他是否輸入了3個負數和4個對數數字
假設他輸入了-7,-8,-3,2,3,4,2,表示您輸入了3個負數和4個正數
import java.util.*;
public class Testing2 {
public static void main(String[] args) {
int numbers;
System.out.println("Input seven numbers");
for (int i = 1; i <8; i++){
Scanner Nums = new Scanner(System.in);
numbers = Nums.nextInt ();
if (numbers < 0){
System.out.println("You have " + numbers + " numbers that are negative");
} else {
System.out.println("You have "+ numbers + " numbers that are postive");
}
}
}
}
資源泄漏:nums永遠不會關閉
我正在使用Eclipse,這顯示了什么。 有人知道為什么嗎?
嘗試這個:
import java.util.*;
public class Testing2 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in); // Don't need to close as System.in
int numNegative = 0, numPositive = 0;
System.out.println("Input seven numbers");
for (int i = 1; i < 8; i++){
int number = scanner.nextInt();
if (number >= 0){ // Is the number positive or 0
numPositive++;
} else { // Otherwise
numNegative++;
}
}
System.out.println("You have " + numPositive + " numbers that are positive");
System.out.println("You have " + numNegative + " numbers that are negative");
}
}
一種方法是使用數組來跟蹤您的七個數字,並使用兩個變量來跟蹤正數或負數(例如pos_numbers和neg_numbers),
這樣,每次您從用戶那里收到輸入時,if else語句都會測試數字是正數還是負數,如果它是正數,則它將pos_numbers變量加1,如果它是負數,則它將增加neg_numbers變量。一個。 用戶輸入完數字后,程序將顯示pos_numbers和neg_numbers的值,以顯示用戶分別輸入了多少個正數和負數。
另外,將行放置在創建for Scan循環之前的Scanner對象的位置也是一個好主意,因為這只需要執行一次,而不必執行多次。
這是代碼:
import java.util.*;
class Testing2 {
public static void main(String[] args) {
int[] numbers = new int[7];
int pos_numbers = 0;
int neg_numbers = 0;
Scanner Nums = new Scanner(System.in);
System.out.println("Input seven numbers");
for (int i = 0; i <7; i++) {
numbers[i] = Nums.nextInt();
if (numbers[i] < 0) neg_numbers++;
else pos_numbers++;
}
System.out.println("You have " + neg_numbers + " numbers that are negative");
System.out.println("You have "+ pos_numbers + " numbers that are postive");
}
}
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