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TopCoder 250 points 12-SRM 149 DIV 2 103.92/250 41.57%

2013-05-31 21:15 411 查看

Problem Statement

In documents, it is frequently necessary to write monetary amounts in a standard format. We have decided to format amounts as follows:

the amount must start with '$'
the amount should have a leading '0' if and only if it is less then 1 dollar.
the amount must end with a decimal point and exactly 2 following digits.
the digits to the left of the decimal point must be separated into groups of three by commas (a group of one or two digits may appear on the left).

Create a class FormatAmt that contains a method amount that takes two int's,
dollars and cents, as inputs and returns the properly formatted String.

Definition

Class:	FormatAmt
Method:	amount
Parameters:	int, int
Returns:	String
Method signature:	String amount(int dollars, int cents)
(be sure your method is public)

Notes

One dollar is equal to 100 cents.

Constraints

dollars will be between 0 and 2,000,000,000 inclusive

cents will be between 0 and 99 inclusive

Examples

Returns: "$123,456.00"

Note that there is no space between the $ and the first digit.

49734321

Returns: "$49,734,321.09"

Returns: "$0.99"

Note the leading 0.

Returns: "$249.30"

Returns: "$1,000.01"

This problem statement is the exclusive and proprietary property of TopCoder, Inc. Any unauthorized use or reproduction of this information without the prior written consent of TopCoder, Inc. is strictly prohibited. (c)2003, TopCoder, Inc. All rights reserved.

写了个很土的办法，，别人有两行就搞定的，要提高基本功啊

public class FormatAmt {

public static String amount(int dollars, int cents) {
int numOfComma = 0;
String s1 = dollars + "";
int len1 = s1.length(), lenA = len1;
String s2 = cents + "";
int len2 = s2.length();
boolean canBeDivided = false;
if (len1 % 3 == 0) {
canBeDivided = true;
}
int l = len1 / 3;
if (len1 > 3) {
numOfComma = canBeDivided ? l - 1 : l;
}
StringBuilder sb = new StringBuilder();
sb.append("$");
if (numOfComma > 0) {
char a[] = s1.toCharArray();
char b[] = new char[len1 + numOfComma];
int temBlen = b.length;
for (int j = 0, i = temBlen - 1; i >= 0; i--)
if (j == 3) {
b[i] = ',';
j = 0;
} else {
b[i] = a[--lenA];
j++;
}
for (int i = 0; i < b.length; i++)
sb.append(b[i]);
} else {
sb.append(s1);
}

sb.append(".");
if (len2 == 2)
sb.append(s2);
else
sb.append("0").append(s2);
return sb.toString();

}
}

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