否则没有 if 错误：我不明白为什么 java 不能识别我的 if 语句
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Else without if error: I dont understand why java isn't recognizing my if statment
提问by allenharveyiii
At line 53 it is giving me an error of else without if. I clearly have an if statement, but i don't know what i'm doing wrong to make java not recognize it. I've tried moving around the braces and nothing is working.
在第 53 行，它给了我一个没有 if 的 else 错误。我显然有一个 if 语句，但我不知道我做错了什么让 java 无法识别它。我试过在大括号周围移动，但没有任何效果。
import java.util.Scanner;
import java.text.DecimalFormat;
public class Quiz6
{
public static void displayInfo()
{
System.out.println(
"\n\tAuthor: Allen Watson \n" +
"\tClass: \tCSCI 1250-001 \n" +
"\tDate: \t10/09/2013 \n" +
"\tLab: \tQuiz6 \n");
}
public static double calculatePay(int hourWorked, double hourlyRate)
{
double dPay;
dPay = (hourWorked * hourlyRate);
return dPay;
}
public static void main(String[] args)
{
Scanner Keyboard = new Scanner(System.in);
DecimalFormat dfMoney = new DecimalFormat("$#,##0.00");
String strName;
int iCount;
int iDaysWorked;
int iTotalHoursWorked;
int iSingleDayHours;
double dHourlyRate;
final byte WEEK = 7;
displayInfo();
System.out.print("\tWhat is your name: ");
strName = Keyboard.nextLine();
System.out.print("\n\tHow many days did you work this week: ");
iDaysWorked = Keyboard.nextByte();
System.out.print("\n\tHow much do you make an hour: ");
dHourlyRate = Keyboard.nextDouble();
if(dDaysWorked <= WEEK);
{
for(iCount = 1; iCount <= iDaysWorked ; iCount++)
{
System.out.print("\tHow many hours did you work on the day"+iCount+":");
iSingleDayHours = Keyboard.nextInt();
iSingleDayHours += iTotalHoursWorked;
}
}
else
{
bDaysWorked = 0;
System.out.print("A week can only have seven days");
}
calculatePay(iTotalHoursWorked,dHourlyRate);
System.out.print("Hello "+strName+", you worked a total of "+iTotalHoursWorked+" hours over "+iDaysWorked+" days.");
System.out.print("\nWith am hourly rate of "+dfMoney(dHourlyRate)+" you made "+dfMoney(dPay)+".");
}
}
采纳答案by óscar López
Here's the problem:
这是问题所在：
if(dDaysWorked <= WEEK); // remove the ;
That trailing ;is making Java believe that the ifstatement is finished, and the {}block after it is outside the ifcondition, consequently the elsepart has no matching ifpreceding it.
该尾随;使 Java 相信该if语句已完成，并且{}它之后的块在if条件之外，因此该else部分在if它之前没有匹配项。
This is a rather frequent bug, and a hard one to spot. If it weren't for the elseblock, the code would have compiled correctly, but it would have been wrong. Bottom line: never, ever put a ;in the opening line of an if, foror whilestatement.
这是一个相当常见的错误，而且很难发现。如果不是else块，代码会正确编译，但它会出错。底线：永远，永远不要;在if,for或while语句的开头放置一个。
回答by I?ya Bursov
if(dDaysWorked <= WEEK); - remove last ;
