New D.I.C Head
Joined: 17 Feb, 2008
Posts: 2
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[code]
Hello
Im not sure if I am responding correctly.
TextIO is a file that was given to us from the instructor.
here it is.
Im really not sure why we are using this?
import java.io.*;
public class TextIO {
// *************************** I/O Methods *********************************
// Methods for writing the primitive types, plus type String,
// to the console, with no extra spaces.
//
// Note that the real-number data types, float
// and double, a rounded version is output that will
// use at most 10 or 11 characters. If you want to
// output a real number with full accuracy, use
// "TextIO.put(String.valueOf(x))", for example.
public static void put(int x) { put(x,0); } // Note: also handles byte and short!
public static void put(long x) { put(x,0); }
public static void put(double x) { put(x,0); } // Also handles float.
public static void put(char x) { put(x,0); }
public static void put(boolean x) { put(x,0); }
public static void put(String x) { put(x,0); }
// Methods for writing the primitive types, plus type String,
// to the console,followed by a carriage return, with
// no extra spaces.
public static void putln(int x) { put(x,0); newLine(); } // Note: also handles byte and short!
public static void putln(long x) { put(x,0); newLine(); }
public static void putln(double x) { put(x,0); newLine(); } // Also handles float.
public static void putln(char x) { put(x,0); newLine(); }
public static void putln(boolean x) { put(x,0); newLine(); }
public static void putln(String x) { put(x,0); newLine(); }
// Methods for writing the primitive types, plus type String,
// to the console, with a minimum field width of w,
// and followed by a carriage return.
// If output value is less than w characters, it is padded
// with extra spaces in front of the value.
public static void putln(int x, int w) { put(x,w); newLine(); } // Note: also handles byte and short!
public static void putln(long x, int w) { put(x,w); newLine(); }
public static void putln(double x, int w) { put(x,w); newLine(); } // Also handles float.
public static void putln(char x, int w) { put(x,w); newLine(); }
public static void putln(boolean x, int w) { put(x,w); newLine(); }
public static void putln(String x, int w) { put(x,w); newLine(); }
// Method for outputting a carriage return
public static void putln() { newLine(); }
// Methods for writing the primitive types, plus type String,
// to the console, with minimum field width w.
public static void put(int x, int w) { dumpString(String.valueOf(x), w); } // Note: also handles byte and short!
public static void put(long x, int w) { dumpString(String.valueOf(x), w); }
public static void put(double x, int w) { dumpString(realToString(x), w); } // Also handles float.
public static void put(char x, int w) { dumpString(String.valueOf(x), w); }
public static void put(boolean x, int w) { dumpString(String.valueOf(x), w); }
public static void put(String x, int w) { dumpString(x, w); }
// Methods for reading in the primitive types, plus "words" and "lines".
// The "getln..." methods discard any extra input, up to and including
// the next carriage return.
// A "word" read by getlnWord() is any sequence of non-blank characters.
// A "line" read by getlnString() or getln() is everything up to next CR;
// the carriage return is not part of the returned value, but it is
// read and discarded.
// Note that all input methods except getAnyChar(), peek(), the ones for lines
// skip past any blanks and carriage returns to find a non-blank value.
// getln() can return an empty string; getChar() and getlnChar() can
// return a space or a linefeed ('\n') character.
// peek() allows you to look at the next character in input, without
// removing it from the input stream. (Note that using this
// routine might force the user to enter a line, in order to
// check what the next character is.)
// Acceptable boolean values are the "words": true, false, t, f, yes,
// no, y, n, 0, or 1; uppercase letters are OK.
// None of these can produce an error; if an error is found in input,
// the user is forced to re-enter.
// Available input routines are:
//
// getByte() getlnByte() getShort() getlnShort()
// getInt() getlnInt() getLong() getlnLong()
// getFloat() getlnFloat() getDouble() getlnDouble()
// getChar() getlnChar() peek() getAnyChar()
// getWord() getlnWord() getln() getString() getlnString()
//
// (getlnString is the same as getln and is only provided for consistency.)
public static byte getlnByte() { byte x=getByte(); emptyBuffer(); return x; }
public static short getlnShort() { short x=getShort(); emptyBuffer(); return x; }
public static int getlnInt() { int x=getInt(); emptyBuffer(); return x; }
public static long getlnLong() { long x=getLong(); emptyBuffer(); return x; }
public static float getlnFloat() { float x=getFloat(); emptyBuffer(); return x; }
public static double getlnDouble() { double x=getDouble(); emptyBuffer(); return x; }
public static char getlnChar() { char x=getChar(); emptyBuffer(); return x; }
public static boolean getlnBoolean() { boolean x=getBoolean(); emptyBuffer(); return x; }
public static String getlnWord() { String x=getWord(); emptyBuffer(); return x; }
public static String getlnString() { return getln(); } // same as getln()
public static String getln() {
StringBuffer s = new StringBuffer(100);
char ch = readChar();
while (ch != '\n') {
s.append(ch);
ch = readChar();
}
return s.toString();
}
public static byte getByte() { return (byte)readInteger(-128L,127L); }
public static short getShort() { return (short)readInteger(-32768L,32767L); }
public static int getInt() { return (int)readInteger((long)Integer.MIN_VALUE, (long)Integer.MAX_VALUE); }
public static long getLong() { return readInteger(Long.MIN_VALUE, Long.MAX_VALUE); }
public static char getAnyChar(){ return readChar(); }
public static char peek() { return lookChar(); }
public static char getChar() { // skip spaces & cr's, then return next char
char ch = lookChar();
while (ch == ' ' || ch == '\n') {
readChar();
if (ch == '\n')
dumpString("? ",0);
ch = lookChar();
}
return readChar();
}
public static float getFloat() {
float x = 0.0F;
while (true) {
String str = readRealString();
if (str.equals("")) {
errorMessage("Illegal floating point input.",
"Real number in the range " + Float.MIN_VALUE + " to " + Float.MAX_VALUE);
}
else {
Float f = null;
try { f = Float.valueOf(str); }
catch (NumberFormatException e) {
errorMessage("Illegal floating point input.",
"Real number in the range " + Float.MIN_VALUE + " to " + Float.MAX_VALUE);
continue;
}
if (f.isInfinite()) {
errorMessage("Floating point input outside of legal range.",
"Real number in the range " + Float.MIN_VALUE + " to " + Float.MAX_VALUE);
continue;
}
x = f.floatValue();
break;
}
}
return x;
}
public static double getDouble() {
double x = 0.0;
while (true) {
String str = readRealString();
if (str.equals("")) {
errorMessage("Illegal floating point input",
"Real number in the range " + Double.MIN_VALUE + " to " + Double.MAX_VALUE);
}
else {
Double f = null;
try { f = Double.valueOf(str); }
catch (NumberFormatException e) {
errorMessage("Illegal floating point input",
"Real number in the range " + Double.MIN_VALUE + " to " + Double.MAX_VALUE);
continue;
}
if (f.isInfinite()) {
errorMessage("Floating point input outside of legal range.",
"Real number in the range " + Double.MIN_VALUE + " to " + Double.MAX_VALUE);
continue;
}
x = f.doubleValue();
break;
}
}
return x;
}
public static String getWord() {
char ch = lookChar();
while (ch == ' ' || ch == '\n') {
readChar();
if (ch == '\n')
dumpString("? ",0);
ch = lookChar();
}
StringBuffer str = new StringBuffer(50);
while (ch != ' ' && ch != '\n') {
str.append(readChar());
ch = lookChar();
}
return str.toString();
}
public static boolean getBoolean() {
boolean ans = false;
while (true) {
String s = getWord();
if ( s.equalsIgnoreCase("true") || s.equalsIgnoreCase("t") ||
s.equalsIgnoreCase("yes") || s.equalsIgnoreCase("y") ||
s.equals("1") ) {
ans = true;
break;
}
else if ( s.equalsIgnoreCase("false") || s.equalsIgnoreCase("f") ||
s.equalsIgnoreCase("no") || s.equalsIgnoreCase("n") ||
s.equals("0") ) {
ans = false;
break;
}
else
errorMessage("Illegal boolean input value.",
"one of: true, false, t, f, yes, no, y, n, 0, or 1");
}
return ans;
}
// ***************** Everything beyond this point is private *******************
// ********************** Utility routines for input/output ********************
private static InputStream in = System.in; // rename standard input stream
private static PrintStream out = System.out; // rename standard output stream
private static String buffer = null; // one line read from input
private static int pos = 0; // position of next char in input line that has
// not yet been processed
private static String readRealString() { // read chars from input following syntax of real numbers
StringBuffer s=new StringBuffer(50);
char ch=lookChar();
while (ch == ' ' || ch == '\n') {
readChar();
if (ch == '\n')
dumpString("? ",0);
ch = lookChar();
}
if (ch == '-' || ch == '+') {
s.append(readChar());
ch = lookChar();
while (ch == ' ') {
readChar();
ch = lookChar();
}
}
while (ch >= '0' && ch <= '9') {
s.append(readChar());
ch = lookChar();
}
if (ch == '.') {
s.append(readChar());
ch = lookChar();
while (ch >= '0' && ch <= '9') {
s.append(readChar());
ch = lookChar();
}
}
if (ch == 'E' || ch == 'e') {
s.append(readChar());
ch = lookChar();
if (ch == '-' || ch == '+') {
s.append(readChar());
ch = lookChar();
}
while (ch >= '0' && ch <= '9') {
s.append(readChar());
ch = lookChar();
}
}
return s.toString();
}
private static long readInteger(long min, long max) { // read long integer, limited to specified range
long x=0;
while (true) {
StringBuffer s=new StringBuffer(34);
char ch=lookChar();
while (ch == ' ' || ch == '\n') {
readChar();
if (ch == '\n')
dumpString("? ",0);
ch = lookChar();
}
if (ch == '-' || ch == '+') {
s.append(readChar());
ch = lookChar();
while (ch == ' ') {
readChar();
ch = lookChar();
}
}
while (ch >= '0' && ch <= '9') {
s.append(readChar());
ch = lookChar();
}
if (s.equals("")){
errorMessage("Illegal integer input.",
"Integer in the range " + min + " to " + max);
}
else {
String str = s.toString();
try {
x = Long.parseLong(str);
}
catch (NumberFormatException e) {
errorMessage("Illegal integer input.",
"Integer in the range " + min + " to " + max);
continue;
}
if (x < min || x > max) {
errorMessage("Integer input outside of legal range.",
"Integer in the range " + min + " to " + max);
continue;
}
break;
}
}
return x;
}
private static String realToString(double x) {
// Goal is to get a reasonable representation of x in at most
// 10 characters, or 11 characters if x is negative.
if (Double.isNaN(x))
return "undefined";
if (Double.isInfinite(x))
if (x < 0)
return "-INF";
else
return "INF";
if (Math.abs(x) <= 5000000000.0 && Math.rint(x) == x)
return String.valueOf( (long)x );
String s = String.valueOf(x);
if (s.length() <= 10)
return s;
boolean neg = false;
if (x < 0) {
neg = true;
x = -x;
s = String.valueOf(x);
}
if (x >= 0.00005 && x <= 50000000 && (s.indexOf('E') == -1 && s.indexOf('e') == -1)) { // trim x to 10 chars max
s = round(s,10);
s = trimZeros(s);
}
else if (x > 1) { // construct exponential form with positive exponent
long power = (long)Math.floor(Math.log(x)/Math.log(10));
String exp = "E" + power;
int numlength = 10 - exp.length();
x = x / Math.pow(10,power);
s = String.valueOf(x);
s = round(s,numlength);
s = trimZeros(s);
s += exp;
}
else { // constuct exponential form
long power = (long)Math.ceil(-Math.log(x)/Math.log(10));
String exp = "E-" + power;
int numlength = 10 - exp.length();
x = x * Math.pow(10,power);
s = String.valueOf(x);
s = round(s,numlength);
s = trimZeros(s);
s += exp;
}
if (neg)
return "-" + s;
else
return s;
}
private static String trimZeros(String num) { // used by realToString
if (num.indexOf('.') >= 0 && num.charAt(num.length() - 1) == '0') {
int i = num.length() - 1;
while (num.charAt(i) == '0')
i--;
if (num.charAt(i) == '.')
num = num.substring(0,i);
else
num = num.substring(0,i+1);
}
return num;
}
private static String round(String num, int length) { // used by realToString
if (num.indexOf('.') < 0)
return num;
if (num.length() <= length)
return num;
if (num.charAt(length) >= '5' && num.charAt(length) != '.') {
char[] temp = new char[length+1];
int ct = length;
boolean rounding = true;
for (int i = length-1; i >= 0; i--) {
temp[ct] = num.charAt(i);
if (rounding && temp[ct] != '.') {
if (temp[ct] < '9') {
temp[ct]++;
rounding = false;
}
else
temp[ct] = '0';
}
ct--;
}
if (rounding) {
temp[ct] = '1';
ct--;
}
// ct is -1 or 0
return new String(temp,ct+1,length-ct);
}
else
return num.substring(0,length);
}
private static void dumpString(String str, int w) { // output string to console
for (int i=str.length(); i<w; i++)
out.print(' ');
for (int i=0; i<str.length(); i++)
if ((int)str.charAt(i) >= 0x20 && (int)str.charAt(i) != 0x7F) // no control chars or delete
out.print(str.charAt(i));
else if (str.charAt(i) == '\n' || str.charAt(i) == '\r')
newLine();
}
private static void errorMessage(String message, String expecting) {
// inform user of error and force user to re-enter.
newLine();
dumpString(" *** Error in input: " + message + "\n", 0);
dumpString(" *** Expecting: " + expecting + "\n", 0);
dumpString(" *** Discarding Input: ", 0);
if (lookChar() == '\n')
dumpString("(end-of-line)\n\n",0);
else {
while (lookChar() != '\n')
out.print(readChar());
dumpString("\n\n",0);
}
dumpString("Please re-enter: ", 0);
readChar(); // discard the end-of-line character
}
private static char lookChar() { // return next character from input
if (buffer == null || pos > buffer.length())
fillBuffer();
if (pos == buffer.length())
return '\n';
return buffer.charAt(pos);
}
private static char readChar() { // return and discard next character from input
char ch = lookChar();
pos++;
return ch;
}
private static void newLine() { // output a CR to console
out.println();
out.flush();
}
private static boolean possibleLinefeedPending = false;
private static void fillBuffer() { // Wait for user to type a line and press return,
// and put the typed line into the buffer.
StringBuffer b = new StringBuffer();
out.flush();
try {
int ch = in.read();
if (ch == '\n' && possibleLinefeedPending)
ch = in.read();
possibleLinefeedPending = false;
while (ch != -1 && ch != '\n' && ch != '\r') {
b.append((char)ch);
ch = in.read();
}
possibleLinefeedPending = (ch == '\r');
if (ch == -1) {
System.out.println("\n*** Found an end-of-file while trying to read from standard input!");
System.out.println("*** Maybe your Java system doesn't implement standard input?");
System.out.println("*** Program will be terminated.\n");
throw new RuntimeException("End-of-file on standard input.");
}
}
catch (IOException e) {
System.out.println("Unexpected system error on input.");
System.out.println("Terminating program.");
System.exit(1);
}
buffer = b.toString();
pos = 0;
}
private static void emptyBuffer() { // discard the rest of the current line of input
buffer = null;
}
static void putln(String string, double average) {
throw new UnsupportedOperationException("Not yet implemented");
}
} // end of class TextIO
[code/]
This post has been edited by AmylynnNY: 18 Feb, 2008 - 09:56 AM
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