尝试编译时出现此错误：`error：void expression of void expression
我在倒数第二行收到此错误：public class Base {
// Pass monthName param as "August"
public int getMonthNumber(String monthName) throws ParseException {
Date date = new SimpleDateFormat("MMMM").parse(monthName);
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
System.out.println(calendar.get(Calendar.MONTH) + 1);
return calendar.get(Calendar.MONTH) + 1;
}
// Pass date param as "Sun, Jul 1"
public String getMonthNameInThreeChars(String date) {
return date.substring(5, 8);
}
}
public class CommonLocators extends Base {
public void setAndroidDatePicker(String date) throws IOException, ParseException {
int thisYear = Integer.valueOf(androidDriver.findElement(By.id("android:id/date_picker_header_year")).getAttribute("name"));
String today = androidDriver.findElement(By.id("android:id/date_picker_header_date")).getAttribute("name");
int thisMonth = getMonthNumber(getMonthNameInThreeChars(today));
// Split the given date into date, month and year
String[] splitdate = date.split("\\s+");
int givenDay = Integer.valueOf(splitdate[0]);
int givenMonth = getMonthNumber(splitdate[1]);
int givenYear = Integer.valueOf(splitdate[2]);
int forwardTaps = 0;
int backwardTaps = 0;
int yearFactor = 0;
if (givenYear == thisYear)
{
if (givenMonth >= thisMonth)
{
forwardTaps = givenMonth - thisMonth;
} else {
backwardTaps = thisMonth - givenMonth;
}
}
else if (givenYear > thisYear)
{
yearFactor = (givenYear - thisYear) * 12;
if (givenMonth >= thisMonth)
{
forwardTaps = yearFactor + (givenMonth - thisMonth);
} else {
forwardTaps = yearFactor - (thisMonth - givenMonth);
}
}
else {
yearFactor = (thisYear - givenYear) * 12;
if (givenMonth >= thisMonth)
{
backwardTaps = yearFactor - (givenMonth - thisMonth);
} else {
backwardTaps = yearFactor + (thisMonth - givenMonth);
}
}
for (int i=1; i<=forwardTaps; i++) {
androidDriver.findElement(By.id("android:id/next")).click();
}
for (int i=1; i<=backwardTaps; i++) {
androidDriver.findElement(By.id("android:id/prev")).click();
}
String xpath = "//android.view.View[@text='day']";
androidDriver.findElement(By.xpath(xpath.replace("day", String.valueOf(givenDay)))).click();
//Tap on OK button of the date picker
androidDriver.findElement(By.id("android:id/button1")).click();
}
}
public class CommonStepDefinitions {
@Test
public void setDate(String date) throws IOException, ParseException {
commonLocators.setAndroidDatePicker(date);
}
}
我不明白为什么。我正在尝试编写打印queueDump(f, q, printToken(f, e));
printToken
e答案 0 :(得分：0)
当您将执行结果传递给它时，queueDump函数需要指向函数的指针。
printToken(f, e)使用参数printToken和f执行函数e。除此之外，您应该将3个参数传递给queueDump - printToken，f，e; queueDump将使用这些参数执行实际执行。
（在您的特定情况下，FILE *f和c->value用作prinToken的参数，因此无需传递其他参数