Trying to write a simple compiler in java (I am using notepad ++)
My question is how to write a simple compiler, similar to the compilers used in fax machines, that convert something like aaaavvvvdddddddddddd to 4a5vBd.
Also, I get "Assume" that any line entered will not contain any uppercase letters and numbers, and any line will contain less than 61 characters of any type, so I am assuming that no one will be put into 64 continues in my program.
This is as far as I got
import java.util.*;
public class Program4
{
public static void main(String[] args)
{
Scanner scan = new Scanner(System.in);
int n;
char cn;
String word;
String numChars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
System.out.println("Hello, please enter a string");
word = scan.nextln();
if(n <= 61)
{
int n = ?;
cn = numChars.charAt(n);
}
}
}
I'm guessing I need to use a loop, but I don't know what I should use to count the repeated letters and then indicate how many letters of that type are in the string. Now I only ask for advice and not so much for the code because I want to do this, but as a beginner my Java "Dictionary" is not very big right now.
Any advice / advice is greatly appreciated.
Regards, Mr. Trips
Well i'm back and i feel like my code here only likes to print 147. no matter what i type i always get 147. i tried to track all my variables but when i do i get exactly what i want and I must have some error in my logic. Any thoughts?
import java.util.*;
public class Program4
{
public static void main(String[] args)
{
Scanner scan = new Scanner(System.in);
int n = 0;
int s = 0;
char a;
char b;
char c;
String word;
String numChars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
System.out.println("Please enter a string");
word = scan.nextLine();
while (n < word.length())
{
a = word.charAt(n);
b = a;
n = n ++;
a = word.charAt(n);
if (a == b)
{
s = (s + 1) ;
}
else if (a != b);
{
c = numChars.charAt(s);
System.out.print(b + c);
s = 0;
c = 0;
break;
}
}
}
}
Thanks again!
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Since you don't want the code, it's logical how to do it. You are correct, you have to loop through the line for each char. Store the last char in a variable and store the counter variable. Compare the current char to the last char if equal, then increment the counter. Once it doesn't equal the last char, add counter + last char to the result string and reset the counter variable. Each iteration updates the last char variable.
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