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  1. #1
    cristianll is offline Member
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    Question Troubles,convert C/C++ Code to Java

    Hi!, I have to convert that C/C++ Code to Java and some troubles appear, the C/C++ Code is :

    Java Code:
    #include <stdio.h> 
     
    int Bit() { 
       char c; 
       scanf(" %c", &c); 
       return c-'0'; 
    } 
     
    int Len() { 
       int len; 
     
       len = 4*Bit(); 
       len += 2*Bit(); 
       len += Bit(); 
     
       return len; 
    } 
     
    int Code(int len) { 
       int val=0, i, pow2=2, base=0; 
     
          /* read in the bits */ 
       for (i=0; i<len; i++) { 
          val = val*2 + Bit(); 
       } 
          /* val now contains the decimal representation of the bit code */ 
          /* now figure out that code's place int the sequence */ 
       for (i=0; i<len-1; i++) { 
          base += pow2-1; 
          pow2 *= 2; 
       } 
     
          /* if val is all 1's ( (2^n)-1 ), end here, return -1 */ 
       if (val == pow2-1) { 
          return -1; 
       } else { 
          return val + base; 
       } 
    } 
        
     
    int main() { 
       char header[300]; 
       int len; 
       int code1; 
     
       while (scanf(" "), 1==scanf("%[^\n]", header)) { 
          while (len = Len(), len) { 
      while (code1 = Code(len), code1 != -1) { 
         putchar(header[code1]); 
      } 
          } 
          putchar('\n'); 
       } 
     
       return 0; 
    }
    Java code:

    Java Code:
    package messagedecoding;
    
    import java.io.IOException;
    
    public class Main {
    
        public static void main(String[] args) throws IOException {
            Header header = new Header();
            header.putCharAndShowMessage();
        }
    }
    Java Code:
    package messagedecoding;
    
    import java.io.IOException;
    import java.util.Scanner;
    
    public class Header {
        int i=0,u=-1,len,code1;
        Code code = new Code();
    
        public void putCharAndShowMessage() throws IOException{
            System.out.println("Write characters");
            Scanner reader = new Scanner(System.in);
            System.out.println("1");
            String header = reader.nextLine();
            System.out.println("2");
            if(header.length()>300){
                System.out.println("3");
                header=header.substring(0,300);
                System.out.println("4");
            }
            System.out.println("Write binary code");
            while(header.charAt(i)!='\n'){
            len=(int)code.Len();
            System.out.println("len initialized");
                while(len!=0){
                    System.out.println("len checked");
                    code1=(int)code.Code(len);
                    System.out.println("code1 initialized");
                    while(code1!=u){
                        System.out.println("1's String checked");
                        System.out.println(header.charAt(code1));
                    }
                }
                i+=1;
                System.out.println('\n');
        }
    }
    }
    Java Code:
    package messagedecoding;
    
    import java.io.*;
    import java.util.Scanner;
    
    public class Code {
        int len,i,val = 0,base = 0,pow2 = 2,d;
        char c;
    
        public int Bit() throws IOException{
            Scanner reader = new Scanner(System.in);
            c=(char)reader.nextByte();
            System.out.println("a");
             return c-'0';
        }
    
        public int Len() throws IOException{
            len = 4*Bit();
            System.out.println("b");
            len += 2*Bit();
            System.out.println("c");
            len += Bit();
            System.out.println("d");
            return len;
        }
        
        public int Code(int len) throws IOException{
            for(i=0;i<len;i++){
                val = val*2+Bit();
                System.out.println("e");
            }
            for(i=0;i<len;i++){
                base += pow2-1;
                System.out.println("f");
                pow2 *= 2;
                System.out.println("g");
            }
            if(val==pow2-1){
                return -1;
            }else{
                return val+base;
            }
        }
    }
    When run with NetBeans show me this:

    Java Code:
    run:
    Write characters
    1
    TAN
    2
    Write binary code
    0
    a
    b
    0
    a
    c
    1
    a
    d
    len initialized
    len checked
    code1 initialized
    1's String checked
    T
    1's String checked
    T
    1's String checked
    T
    I dunno why enter in infinite boucle, never show me the Code() method prints, and need to write the binary code in 1 line, how can do that? and ever the result is t, I dunno what thing is wrong... Thks!

    PS: if someone want know what the program will do:
    Java Code:
    Message Decoding 
    
    Some message encoding schemes require that an encoded message be sent in two parts. 
    The first part, called the header, contains the characters of the message. The second part 
    contains a pattern that represents the message. You must write a program that can decode 
    messages under such a scheme.
    
    The heart of the encoding scheme for your program is a sequence of ``key" strings of 0's
     and 1's as follows:
    
    
    
    The first key in the sequence is of length 1, the next 3 are of length 2, the next 7 of length 3,
     the next 15 of length 4, etc. If two adjacent keys have the same length, the second can be 
    obtained from the first by adding 1 (base 2). Notice that there are no keys in the sequence 
    that consist only of 1's.
    
    The keys are mapped to the characters in the header in order. That is, the first key (0) is 
    mapped to the first character in the header, the second key (00) to the second character 
    in the header, the kth key is mapped to the kth character in the header. For example, 
    suppose the header is:
    
    AB#TANCnrtXc
    
    Then 0 is mapped to A, 00 to B, 01 to #, 10 to T, 000 to A, ..., 110 to X, and 0000 to c.
    
    The encoded message contains only 0's and 1's and possibly carriage returns, which are 
    to be ignored. The message is divided into segments. The first 3 digits of a segment give 
    the binary representation of the length of the keys in the segment. For example, if the first
     3 digits are 010, then the remainder of the segment consists of keys of length 2 (00, 01, or 10).
     The end of the segment is a string of 1's which is the same length as the length of the keys in 
    the segment. So a segment of keys of length 2 is terminated by 11. The entire encoded message 
    is terminated by 000 (which would signify a segment in which the keys have length 0). The 
    message is decoded by translating the keys in the segments one-at-a-time into the header
     characters to which they have been mapped.
    
    Input
    
    The input file contains several data sets. Each data set consists of a header, which is on a single
     line by itself, and a message, which may extend over several lines. The length of the header is 
    limited only by the fact that key strings have a maximum length of 7 (111 in binary). If there are 
    multiple copies of a character in a header, then several keys will map to that character. The 
    encoded message contains only 0's and 1's, and it is a legitimate encoding according to the 
    described scheme. That is, the message segments begin with the 3-digit length sequence and 
    end with the appropriate sequence of 1's. The keys in any given segment are all of the same 
    length, and they all correspond to characters in the header. The message is terminated by 000.
    
    Carriage returns may appear anywhere within the message part. They are not to be considered
     as part of the message.
    
    Output
    
    For each data set, your program must write its decoded message on a separate line. There 
    should not be blank lines between messages.
    
    Sample input
    
    TNM AEIOU
    0010101100011
    1010001001110110011
    11000
    $#**\
    0100000101101100011100101000 
    Sample output
    
    TAN ME
    ##*\$
    THKS!
    Last edited by cristianll; 11-15-2009 at 12:56 AM.

  2. #2
    Eranga's Avatar
    Eranga is offline Moderator
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