英文:
The program is showing a missing statement . Why is this error coming?
问题
static String dayOfProgrammer(int year) {
if (year == 1918) {
String date = "26:08:" + year;
return date;
}
if (year < 1918 || year > 1918) {
if (year % 4 == 0) {
String date = "12:09:" + year;
return date;
} else {
String date = "13:09:" + year;
return date;
}
}
}
英文:
static String dayOfProgrammer(int year) {
if(year==1918){
String date= "26:08:"+year;
return date;
}
if(year<1918|| year>1918){
if(year%4==0){
String date= "12:09:"+year;
return date;
}
else{
String date= "13:09:"+year;
return date;
}
}
}
> Blockquote the method accepts an integer value "year" and should return a String value "date". but due to so issue ,it showcases a runtime error of missing return statement when tested against multiple test cases.
答案1
得分: 2
The compiler cannot guarantee that all paths return a value. Change your statement if(year<1918|| year>1918) to an else, and all paths will return:
static String dayOfProgrammer(int year) {
if (year == 1918) {
String date = "26:08:" + year;
return date;
} else {
if (year % 4 == 0) {
String date = "12:09:" + year;
return date;
} else {
String date = "13:09:" + year;
return date;
}
}
}
英文:
The compiler can not guarantee all paths return a value. Switch your statementif(year<1918|| year>1918) for an else and all paths will return:
static String dayOfProgrammer(int year) {
if(year==1918){
String date= "26:08:"+year;
return date;
}
else{
if(year%4==0){
String date= "12:09:"+year;
return date;
}
else{
String date= "13:09:"+year;
return date;
}
}
}
答案2
得分: 0
上一个答案来自 @HaroldH，是正确的，但我建议使用更简单的布局。
static String dayOfProgrammer(int year) {
if (year == 1918) {
return "26:08:" + year;
}
else if (year % 4 == 0) {
return "12:09:" + year;
}
else {
return "13:09:" + year;
}
}
或者（因为在return之后没有需要else）
static String dayOfProgrammer(int year) {
if (year == 1918) {
return "26:08:" + year;
}
if (year % 4 == 0) {
return "12:09:" + year;
}
return "13:09:" + year;
}
这两个版本的简单布局使得控制流在一瞥之间就能看清楚，并且你可以看到总是会执行一个return。
else if (...) 的放置在一行上，不会导致进一步的缩进，强调了代码在选择不同选项之间做了一个简单的顺序选择。
实际上你不需要else - 就像第二个例子中一样。我认为在这种情况下我更喜欢第一个，但没有硬性规定；重要的是最终代码的透明度。
你会注意到我删除了data 变量；它们在这里没有真正的用途。
英文:
The previous answer from @HaroldH is correct, but I'd suggest a simpler layout.
static String dayOfProgrammer(int year) {
if (year == 1918) {
return "26:08:" + year;
}
else if (year%4 == 0) {
return "12:09:" + year;
}
else {
return "13:09:" + year;
}
}
or even (since there's no need for the 'else' after a 'return')
static String dayOfProgrammer(int year) {
if (year == 1918) {
return "26:08:" + year;
}
if (year%4 == 0) {
return "12:09:" + year;
}
return "13:09:" + year;
}
The simpler layout of these two versions makes the control-flow obvious at a glance, and you can see there is always a return executed.
The placement of 'else if (…)' on one line that does not cause further indentation emphasizes that the code is making a simple sequence of choices between alternatives.
You don't actually need the 'else' - as in the second example. I regard that choice here as a matter of taste; I think I prefer the first in this case, but there are no hard-and-fast rules; what matters is the transparency of the resulting code.
You'll note I eliminated the 'data' variables; they served no real purpose here.
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