1.4---字符串空格变成20%(CC150)

import CtCILibrary.AssortedMethods;

public class Question {
// Assume string has sufficient free space at the end
public static void replaceSpaces(char[] str, int length) {
int spaceCount = 0, index, i = 0;
for (i = 0; i < length; i++) {
if (str[i] == ' ') {
spaceCount++;
}
}
index = length + spaceCount * 2;
str[index] = '\0';
for (i = length - 1; i >= 0; i--) {
if (str[i] == ' ') {
str[index - 1] = '0';
str[index - 2] = '2';
str[index - 3] = '%';
index = index - 3;
} else {
str[index - 1] = str[i];
index--;
}
}
} public static void main(String[] args) {
String str = "abc d e f";
char[] arr = new char[str.length() + 3 * 2 + 1];
for (int i = 0; i < str.length(); i++) {
arr[i] = str.charAt(i);
}
replaceSpaces(arr, str.length());
System.out.println("\"" + AssortedMethods.charArrayToString(arr) + "\"");
}
}
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