still having trouble with ASCII chars and very simple encryption

[Once-ler]

I am trying to make a simple program that writes source code for a much larger program. I don't know what I am getting wrong. Here is my code it is a simple reversal:

 #include int main() {     FILE *fp; fp=fopen("d:\\crypt.h", "w");  fprintf(fp, "char out[8];char cur[8];         char con[255,255,255,255,255,255,255,255];/n         if cur==con out==0,0,0,0,0,0,0,0;/n         while(cur =con out=out+1;           ");          return 0; }

[Once-ler]

does anyone know why my code posts all bunched up on a single line? I am using Firefox but the code looks fine until I post it and I have tried editing it but the save button wont work.

[c99tutorial]

Maybe try pasting your code from a plain-text editor like notepad. E.g. copy/paste from YourFavoriteEditor into notepad and then afterwards copy/paste from notepad into the browser. Maybe there is some kind of rich text formatting going on that is messing up the embedded editor. Also as previously mentioned click "Go advanced" in the edit screen to see a preview first.

[Once-ler]

#include<stdio.h>
int main()
{
    FILE *fp;
fp=fopen("d:\\crypt.h", "w");

fprintf(fp, "char out[8];char cur[8];"
        "char con[255,255,255,255,255,255,255,255];/n"
        "if cur==con out==0,0,0,0,0,0,0,0;/n"
        "while(cur <= con) /n"
        "con=con-1/n"

        "if cur>=con out=out+1;");
         return 0;
}

[c99tutorial]

Looks a little better, you should work on the indentation. Comments:

- You must close your file before you exit the program, otherwise the contents will be undefined if you tried to write to it.
- For text files you should end with a newline.
- When you open a file you need to make sure it actually worked. What if "d:\\crypt.h" is not writable?

#include <stdio.h>
#include <stdlib.h>

int main()
{
    const char *filename = "c:\\crypt.h";
    FILE *fp;
    fp=fopen(filename, "w");
    if (fp == NULL) {
        perror(filename);
        exit(1);
    }
    fprintf(fp, "char out[8];char cur[8];"
        "char con[255,255,255,255,255,255,255,255];/n"
        "if cur==con out==0,0,0,0,0,0,0,0;/n"
        "while(cur <= con) /n"
        "con=con-1/n"
        "if cur>=con out=out+1;"
    );
    fprintf(fp, "\n");
    fclose(fp);
    return 0;
}

[Once-ler]

It writes to it one line of code that is, I just can't get this figured out-how to make it completely write itself for all the values.

[Once-ler]

should I have declared some vars outside of the fprintf?

[c99tutorial]

Yes, it writes one line of code. The line terminator (newline character) is "\n" by the way not "/n". Maybe you want to change those to newline characters for multiple-line output.

[Once-ler]

thanks I didn't catch that.

[Once-ler]

is it possible to compare char arrays? I read in a dummies book that you can't compare strings unless it is with strcmp and it returns 0 if it finds a match which if true means that I am doing it all wrong and should be comparing unsigned long longs. Is this what I should be doing is %llu?

[Once-ler]

I need the >< to work

[c99tutorial]

I read in a dummies book that you can't compare strings unless it is with strcmp and it returns 0 if it finds a match

What do you mean when it finds a "match"? Maybe for learning you can use whatever book you want but to clarify meanings of return codes and parameters instead try a good function reference e.g. "man 3 strcmp"

strcmp(3): compare two strings - Linux man page

[Once-ler]

 #include int main() {     unsigned long long count;     char output=5;      FILE *fp;          fp=fopen("d:\\crypt.h", "w");          (count & 1) ===>          fprintf(fp, "char out[8];unsigned long long cur;"         "unsigned long long con =18446744073709551615;\n"         "if cur==con out==255,255,255,255,255,255,255,255;\n"         "while(cur =con out=out+1;");          return 0; }

would that be better?

[Once-ler]

  #include  int main()  {      unsigned long long count;      char output=5;       FILE *fp;           fp=fopen("d:\\crypt.h", "w");           (count & 1) ===>   fprintf(fp, "char out[8];unsigned long long cur;"          "unsigned long long con =18446744073709551615;\n"          "if cur==con out==255,255,255,255,255,255,255,255;\n"          "while(cur =con out=out+1;");           return 0; }

would that be better? sorry about that would it be easier to do it this way?

[Once-ler]

  #include int main() {     unsigned long long count =18446744073709551615;     char output=5;      FILE *fp;          fp=fopen("d:\\crypt.h", "w");          while (count !=0);          fprintf(fp, "char out[8];unsigned long long cur;"         "unsigned long long con =;\n%llu");count;         "if cur==con out==255,255,255,255,255,255,255,255;\n"         "out=out-2";             "con=con-1\n";          "count=count-8\n";          printf("%llu",count);          return 0; }

This is what I have after reading a book that said you can't compare strings or char arrays with the conditional statements. Can anyone help me get this thing come to life so it can output some code?