Thread: how do I morse code converting program

I was wondering if anyone could help me with this... I'm trying to write a program that takes an input txt file, reads a line (either in english or in morse code ( ie --.- ) and converts it to its counterpart...

I wrote a code that can scan the data one line at a time, I want to test the line to see if it consist of letters, or dashes and dots (morse code) so I can send it to an appropriate function to convert it....

I can't figure out how to test for this though, I'm trying to make a conditional statement say

Code:

if( line == char ) 
{}

does anyone know a way I may be able to test for this...

so far my code looks like this

Code:

main() {
       
     FILE *fin,*fout;
     fin = fopen("morse.txt","r");
     fout = fopen("morse_out.txt","w"); 
     
     char line[Max_Size + 1];  /* This is used to store the output lines */
     
     
          while ( fgets( line, Max_Size + 1, fin ) != NULL )     
     {              
           fprintf(fout,"%s", line);
           fprintf(fout,"WHERE", line);
          
     }
}

it says where cause I am trying to get it to stop after it reads a line so i can test it

thank you, any help/suggestions are greatly aprreciated

line is a character array, you can't compare it to a single char.

However you can easily test if the line consists only of letters, or only of dots and dashes. You can iterate through the array and test each character - if each character passes the test, the whole line is good. So for instance, you might look at the first character. If it's a letter, you know you are dealing with letters. If it's a '-' or a '.' you know you are dealing with morse code. Then go along the array and make sure each character is either a letter, or a '-' or a '.', depending on which the first character was. If not all characters match, your input is invalid. If you do it this way, the isalpha() function will be helpful.

Alternately, and probably easier, you could use sscanf. You could use a line like this:

Code:

sscanf(line, "%[-. \t\n] ", line);

to match morse code. I have included spaces, tabs and newlines as valid characters, omit them or add more as you require. To ensure that the whole string was matched, you can check strlen(line) before and after and make sure they are the same. If they are not, some characters did not match.

To do a similar thing with letters, you could use:

Code:

sscanf(line, "%[A-Za-z \t\n] ", line);

Again, if you want more or less valid characters, just change what's inside the []'s.

Thank you for your help, does it matter that my string which consist of letters may also include periods and hyphens in the text?

SlyMaelstrom: You could of course read into another variable, I just figured he wouldn't want to do anything with line if the input was invalid, and if it is valid, line will not change.

panfilero: To match other characters as well as letters, add them to the brackets, for instance, if you wanted to include punctuation characters you might do: [A-Za-z,.-?! \t\n]. You could also add any other punctuation you consider to be valid input. If you are going to have a lot of punctuation though, it might be a good idea to #define your set of characters and make the format string at runtime.

If you are going to include periods and hyphens in your plaintext input, I would suggest scanning for morse code first, as your check letters would also match morse code.

I have this declared as a global variable:

Code:

char morsecode[45][8] = {
      "a.-","b-...","c-.-.","d-..","e.","f..-.","g--.","h....","i..",
      "j.---","k-.-","l.-..","m--","n-.","o---","p.--.","q--.-","r.-.",
      "s...","t-","u..-","v...-","w.--","x-..-","y-.--","z--..","0-----",
      "1.----","2..---","3...--","4....-","5.....","6-....","7--...",
      "8---..","9----.","..-.-.-",",--..--",":---...","?..--..","'.----.",
      "--....-","/-..-.","(-.--.-","\".-..-."};

So I was going to try and use this to check my string like this:

Code:

    /***** Loop that checks is string is Morse Code or English ****/
           
           for ( x = 0 ; x < length ; x++ ) {
               
               for ( k=0; k <= 25 ;k++){
           
           if ( string1[x] == morsecode[k][0] ) {
              is_Morse = 0; 
              break;} 
              else is_Morse = 1;
              }
              }
              
    
                   
if( is_Morse == 1 ) {
    fprintf (fout," Morse to English Goes here \n "); }
if( is_Morse == 0 ){
    fprintf(fout," English to Morse Goes Here \n"); }
         
}

But for some reason after every string it prints "Morse to english goes here"

Is my logic wrong here? I think this code is checking to see if any part of a string is a letter, and if it is to say is_Morse == 0

I dont know why it isn't working.


Thank You

Thanks, your codes is working, I wish I could understand it better, I'm not sure how it is distinguishing between morse and english without getting confused by the english that contains periods and hyphens

appreciate the help

Does this code look bad to you? I'm trying to turn the string1 array from english into morse code. But it says I'm trying to compare a pointer and an interger.... i think the logic is ok, I don't see why it's giving me this error.

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define Max_Size 80

char morsecode[45][8] = {
      "a.-","b-...","c-.-.","d-..","e.","f..-.","g--.","h....","i..",
      "j.---","k-.-","l.-..","m--","n-.","o---","p.--.","q--.-","r.-.",
      "s...","t-","u..-","v...-","w.--","x-..-","y-.--","z--..","0-----",
      "1.----","2..---","3...--","4....-","5.....","6-....","7--...",
      "8---..","9----.","..-.-.-",",--..--",":---...","?..--..","'.----.",
      "--....-","/-..-.","(-.--.-","\".-..-."};
 
char string1[] = { 'H','e','l','l','o' };                
                        
             
main() { 
  
  int length;     
  int x;
  int n = 1;
  int k;     
  char string2[80];
  
     length = strlen( string1);  
       
       
     for(x=0;x<=length;x++){
                              
       for(k=0;k<=48;k++) {
                        
           if( string1[x] == morsecode[k][0] ) {
               
               while( morsecode[k][n] != NULL ) {
                      
                      string2[n-1] = morsecode[k][n];
                      
                      n += 1;  }
                      
                      }
                      
                      }

I don't understand why that doesnt work, because when i do this, I get no error.... (This is just the last while loop)

Code:

 

 
 
 #include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define Max_Size 80

char morsecode[45][8] = {
      "a.-","b-...","c-.-.","d-..","e.","f..-.","g--.","h....","i..",
      "j.---","k-.-","l.-..","m--","n-.","o---","p.--.","q--.-","r.-.",
      "s...","t-","u..-","v...-","w.--","x-..-","y-.--","z--..","0-----",
      "1.----","2..---","3...--","4....-","5.....","6-....","7--...",
      "8---..","9----.","..-.-.-",",--..--",":---...","?..--..","'.----.",
      "--....-","/-..-.","(-.--.-","\".-..-."};
 
char string1[] = { 'H','e','l','l','o' };                
             
             
             
main() { 
  
  int length;     
  int x=3;
  int n = 1;
  int k;     
  char string2[80];
  
     length = strlen( string1);   
      
        
       
       while( morsecode[x][n] != NULL ) {
       
       string2[n-1] = morsecode[3][n];
       
       n += 1;
       }
       
       printf("%s", string2);
         
       
       getchar();}