Go4Expert - C/C++ Caesar Cipher on a .txt file?

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C/C++ Caesar Cipher on a .txt file?

Hi, How would I go about using the Caesar Cipher technique on a .txt file? E.g. shifting each letter by 3?

Here is my code?

Code:

#include <stdio.h>

#include <conio.h>



#define CNTRLZ 0x1A



char sourceFileName[] = "H:\\text.txt";

char commStreamName[] = "COM1";

FILE *commStream;

FILE *SouceFile;

char charToSend;

char ReadAccess[] = "r";

char WriteAccess[] = "w";

char errorMsg[] = "fail to open data file\n";

char fileopenflag[] = "r";

char EndOfFile[] = "EOF";



int main(void) {

FILE *fp;

FILE *dp;

int c;



if ((dp = fopen("COM1", "r")) == NULL) {

printf("fail to open COM port\n"); return 1;

}





if ((fp = fopen( sourceFileName, "w")) == NULL) {

printf("fail to open data file\n"); return 1;

}





while ((c = fgetc(fp )) != EOF) {

fputc( c, dp);

putch(c);



}



fputc('*', dp);

fclose(dp);

fclose(fp);

}

Any ideas where to start?

Re: C/C++ Caesar Cipher on a .txt file?

Did you even pay any attention to your other thread, with the same code?
http://www.go4expert.com/showthread.php?t=7849

Re: C/C++ Caesar Cipher on a .txt file?

You weren't no help as usual.

Re: C/C++ Caesar Cipher on a .txt file?

Duplicate of C Encryption?? Adding Encryption To Text File?. Thread closed.

If you did not understand on that thread try responding what you could not understand instead of starting fresh.