[英]JAVA Recursive Distance Pseudocode Help
這是我為 JAVA 應用程序編寫的偽代碼,用於使用坐標計算距離。
totalDistance (int[] x, int[] y, int i)
If x = 1 then
distance = pow(x[i] – x[i – 1], 2) + pow(y[i] – y[i – 1], 2)
return round(sqrt(distance))
else
return round(sqrt(distance)) + totalDistance(x, y, i – 1)
我對 Java 不是很好,但我寫了以下內容。 當我將變量傳遞給它時,它會崩潰。
import java.util.Scanner;
class distance {
public static void main(String[] args) {
System.out.println("Welcome to Travel Bliss Distance Calculator!");
Scanner input = new Scanner(System.in);
int[] x = new int[5];
int[] y = new int[5];
String[] city = new String[5];
int i=0;
for (i=0; i < 5;){
System.out.println("Enter X Coordinates>>");
x[i] = input.nextInt();
System.out.println("Enter Y Coordinates>>");
y[i] = input.nextInt();
System.out.println("With Coordinates: (" + x[i] + "," + y[i] + ") ");
i++;
}
totalDistance(x, y, i);
}
public static double totalDistance(int[] x, int[] y, int i){
double distance;
if (i == 1){
distance = pow(x[i] – x[i – 1], 2) + pow(y[i] – y[i – 1], 2);
return distance;
}
else {
return round(sqrt(distance)) + totalDistance(x,y,i-1);
}
}
}
有誰知道我做錯了什么?? 或者為什么我會崩潰
這是錯誤>>
Exception in thread "main" java.lang.Error: Unresolved compilation problems:
Syntax error on token "[", Expression expected after this token
distance cannot be resolved to a variable
The type of the expression must be an array type but it resolved to int
Syntax error on token "Invalid Character", [ expected
The type of the expression must be an array type but it resolved to int
Syntax error on token "Invalid Character", [ expected
Syntax error, insert "]" to complete ArrayAccess
Syntax error, insert "]" to complete ArgumentList
The type of the expression must be an array type but it resolved to int
Syntax error on token "Invalid Character", [ expected
The type of the expression must be an array type but it resolved to int
Syntax error on token "Invalid Character", [ expected
Syntax error, insert "]" to complete ArrayAccess
Syntax error, insert "]" to complete ArgumentList
distance cannot be resolved to a variable
Syntax error on token "Invalid Character", invalid AssignmentOperator
at distance.totalDistance(distance.java:30)
at distance.main(distance.java:24)
public static double totalDistance(int[] x, int[] y, int i){
int distance = pow(x[i] – x[i – 1], 2) + pow(y[i] – y[i – 1], 2);
if (x.length == 1){
return distance;
}
else {
return round(sqrt(distance)) + totalDistance(x,y,i-1);
}
}
您需要將返回類型聲明為 double 而不是 void。 您需要在 if 語句之外聲明變量距離。 數組永遠不會等於 integer,我假設您正在追求它的大小。
你的邏輯在這里仍然有一些錯誤,但我不想為你做所有的功課。
totalDistance
,我認為
if (x == 1)
可能應該改為
if (i == 1)
然后,如果i != 1
,您將跳過distance
的計算,但無論如何都要嘗試使用它。
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