我需要添加两个非常大的数字而不使用highchart()%>%
hc_add_series(pokemon, "scatter", hcaes(x = height, y = weight))
Warning: Error in mutate_impl: Column `x` is of unsupported type quoted call
。我使用了两个字符串参数,但是以下代码仅适用于长度相等的字符串,否则会抛出BigInteger
。我如何通过添加大数字而不考虑它们的长度来解决这个问题?
IndexOutOfBoundsException
答案 0 :(得分:3)
无需将任何参数都用零填充。另外,为了获得更好的性能,请不要使用String + String
。
为结果创建一个char[]
。由于结果可能比最长的输入长1,因此请以该大小创建它。
然后从输入字符串的末尾进行迭代,设置结果中的每个字符。
然后消除由于输入未溢出或输入具有前导零而导致的所有前导零。
最后,使用String(char[] value, int offset, int count)
构造函数从String
创建一个char[]
。
赞:
public static String add(String a, String b) {
int i = a.length();
int j = b.length();
int k = Math.max(i, j) + 1; // room for carryover
char[] c = new char[k];
for (int digit = 0; k > 0; digit /= 10) {
if (i > 0)
digit += a.charAt(--i) - '0';
if (j > 0)
digit += b.charAt(--j) - '0';
c[--k] = (char) ('0' + digit % 10);
}
for (k = 0; k < c.length - 1 && c[k] == '0'; k++) {/*Skip leading zeroes*/}
return new String(c, k, c.length - k);
}
测试
public static void main(String[] args) {
test("1234", "2345"); // test equal-sized inputs, no carry-over
test("12345", "12345"); // test equal-sized inputs, with carry-over
test("54321", "54321"); // test equal-sized inputs, longer result
test("99999", "99999"); // test max result
test("5", "1234"); // test odd-sized inputs, no carry-over
test("5", "12345"); // test odd-sized inputs, with carry-over
test("1", "99999"); // test with a carry-over to longer result
test("001", "00002"); // test leading zeroes in input are eliminated
test("000", "00000"); // test leading zero removal leaves 1 zero
}
public static void test(String a, String b) {
// Test add is commutative, i.e. a+b = b+a
System.out.printf("%s + %s = %s = %s%n", a, b, add(a, b), add(b, a));
}
输出
1234 + 2345 = 3579 = 3579
12345 + 12345 = 24690 = 24690
54321 + 54321 = 108642 = 108642
99999 + 99999 = 199998 = 199998
5 + 1234 = 1239 = 1239
5 + 12345 = 12350 = 12350
1 + 99999 = 100000 = 100000
001 + 00002 = 3 = 3
000 + 00000 = 0 = 0
答案 1 :(得分:2)
您可以在较短的字符串前面加上零,以使其与其他数字的长度匹配:
private static String leftPad(String s, int length) {
if (s.length() >= length)
return s;
StringBuilder sb = new StringBuilder();
for (int i = 0; i < length - s.length(); i++)
sb.append("0");
return sb.toString() + s;
}
public static String add(String originalA, String originalB) {
int maxLength = Math.max(originalA.length(), originalB.length());
String a = leftPad(originalA, maxLength);
String b = leftPad(originalB, maxLength);
... rest of your method
答案 2 :(得分:1)
您可以像这样用零填充字符串:
SELECT DISTINCT COL2 FROM TableName
这将添加前导空格以填充“空白”,然后将其替换为零。
int longestString = Math.max(a.length(), b.length());
a = String.format("%1$" + longestString + "s", a).replace(' ', '0');
b = String.format("%1$" + longestString + "s", b).replace(' ', '0');
public class Mission09 {
public static void main(String[] args) {
System.out.println(add("1", "1333"));
}
public static String add(String a, String b) {
int carry = 0;
String result = "";
int longestString = Math.max(a.length(), b.length());
a = String.format("%1$" + longestString + "s", a).replace(' ', '0');
b = String.format("%1$" + longestString + "s", b).replace(' ', '0');
for (int i = a.length() - 1; i >= 0; i--) {
int digitA = a.charAt(i) - 48;
int digitB = b.charAt(i) - 48;
int resultingNumber = digitA + digitB + carry;
if (resultingNumber >= 10) {
result = (resultingNumber % 10) + result;
carry = 1;
} else {
result = resultingNumber + result;
carry = 0;
}
}
if (carry > 0) {
result = carry + result;
}
return result;
}
}