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

Discussion in 'C++' started by BillyBob, Dec 15, 2007.

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  1. BillyBob

    BillyBob New Member

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    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?
     
    Last edited by a moderator: Dec 16, 2007
  2. Salem

    Salem New Member

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  3. BillyBob

    BillyBob New Member

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    You weren't no help as usual.
     
  4. shabbir

    shabbir Administrator Staff Member

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