我该如何修复这段代码？(if-语句)
我该如何修复这段代码？(if-语句)
提问于 2013-06-08 22:55:15
我正在上一个Java初学者的课程。我不确定如何存储每个if语句的变量。下面是我的代码：
// Variables for the final sum of all even numbers
int evensum1,evensum2,evensum3,evensum4;
if (oneeven < 10){
evensum1 = oneeven;
}
if (twoeven < 10){
evensum2 = twoeven;
}
if (threeeven < 10){
evensum3 = threeeven;
}
if (foureven < 10){
evensum4 = foureven;
}
// Determine if the digits have 2 characters (>= 10); if yes, separate them
else if (oneeven >= 10){
// Convert each multiplied number to a string to separate them again
String char1even = "" + oneeven;
char sep11 = char1even.charAt(0);
char sep12 = char1even.charAt(1);
int val11 = Character.getNumericValue(sep11);
int val12 = Character.getNumericValue(sep12);
evensum1 = val11 + val12;
}
else if (twoeven >= 10){
String char2even = "" + twoeven;
char sep21 = char2even.charAt(0);
char sep22 = char2even.charAt(1);
int val21 = Character.getNumericValue(sep21);
int val22 = Character.getNumericValue(sep22);
evensum2 = val21 + val22;
}
else if (threeeven >= 10){
String char3even = "" + threeeven;
char sep31 = char3even.charAt(0);
char sep32 = char3even.charAt(1);
int val31 = Character.getNumericValue(sep31);
int val32 = Character.getNumericValue(sep32);
evensum3 = val31 + val32;
}
else if (foureven >= 10){
String char4even = "" + twoeven;
char sep41 = char4even.charAt(0);
char sep42 = char4even.charAt(1);
int val41 = Character.getNumericValue(sep41);
int val42 = Character.getNumericValue(sep42);
evensum4 = val41 + val42;
}
// Add the separate even digits together
int finevensum = evensum1 + evensum2 + evensum3 + evensum4;
System.out.println(finevensum);倒数第二行有点问题。我想要做的是得到一个2位数或1位数的first/second/third/数字。根据数字的位数不同，数字的总和也会不同。我想在最后把这些数字加起来。我如何存储每个变量中的值，以便即使在if语句之后也可以使用它们？
回答 1
Stack Overflow用户
回答已采纳
发布于 2013-06-08 23:01:42
当你这样做的时候：
if (foureven < 10){
evensum4 = foureven;
}
// Determine if the digits have 2 characters (>= 10); if yes, separate them
else if (oneeven >= 10){然后else引用的最后一个 if。因此，如果为foureven < 10 (与oneeven无关)，则将输入该值。
你应该这样做：
if (oneeven < 10){
evensum1 = oneeven;
} else { ... //Note that it's redundant to write oneeven >= 10 (对rest if语句执行此操作)
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原文链接：
https://stackoverflow.com/questions/17000733
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