Rot13 in ALGOL 60

Welcome to the Rot13 in ALGOL 60 page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

begin
    procedure usage;
    begin
        outstring(1, "Usage: please provide a string to encrypt\n");
        stop
    end usage;

    integer procedure inAsciiChar;
    begin
        integer ch;

        comment For some reason '%' needs to be represented as '\x25'.
            Also, extra single quote needed to close backtick in string;
        inchar(
            0,
            "\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f"
            "\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f"
            " !\"#$\x25&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNO"
            "PQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~\x7f'",
            ch
        );
        if ch >= 129 then ch := 0;
        inAsciiChar := ch
    end inAsciiChar;

    integer procedure inCharArray(s, maxLen);
    value maxLen;
    integer array s;
    integer maxLen;
    begin
        integer len, ch;

        len := 0;
    inloop:
        ch := inAsciiChar;
        if ch != 0 & len < maxLen then
        begin
            len := len + 1;
            s[len] := ch;
            goto inloop
        end;

        inCharArray := len
    end inCharArray;

    procedure outAsciiChar(ch);
    value ch;
    integer ch;
    begin
        comment For some reason '%' needs to be represented as '\x25'.
            Also, extra single quote needed to close backtick in string;
        outchar(
            1,
            "\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f"
            "\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f"
            " !\"#$\x25&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNO"
            "PQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~\x7f'",
            ch
        )
    end outAsciiChar;

    procedure outCharArray(s, len);
    value len;
    integer array s;
    integer len;
    begin
        integer i;
        for i := 1 step 1 until len do outAsciiChar(s[i])
    end outCharArray;

    procedure rot13(s, len);
    value len;
    integer array s;
    integer len;
    begin
        integer i, ch;

        for i := 1 step 1 until len do
        begin
            comment
                A (65)  ... M (77)  -> N (78)  ... Z (90)
                a (97)  ... m (109) -> n (110) ... z (122)
                N (78)  ... Z (90)  -> A (65)  ... M (77)
                n (110) ... z (122) -> a (97)  ... m (109);
            ch := s[i];
            if (ch >= 65 & ch <= 77) | (ch >= 97 & ch <= 109) then
                s[i] := s[i] + 13
            else if (ch >= 78 & ch <= 90) | (ch >= 110 & ch <= 122) then
                s[i] := s[i] - 13
        end
    end capitialize;

    integer argc, len;
    integer array s[1:256];

    comment Get number of parameters. Exit if too few;
    ininteger(0, argc);
    if argc < 1 then usage;

    comment Get string as integer array. Exit if empty;
    len := inCharArray(s, 256);
    if len < 1 then usage;

    comment Encrypt string with Rot13 and output string as integer array;
    rot13(s, len);
    outCharArray(s, len);
    outstring(1, "\n")
end

Rot13 in ALGOL 60 was written by:

• rzuckerm

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

No 'How to Run the Solution' section available. Please consider contributing.