Rot13 in Algol68

Welcome to the Rot13 in Algol68 page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

PROC usage = VOID: printf(($gl$, "Usage: please provide a string to encrypt"));

PROC rot13 = (STRING s) STRING:
(
    INT code;
    STRING t;
    FOR n TO UPB s
    DO
        # If A-M or a-m, convert to N-Z or n-z by adding 13 to ASCII code #
        # Else, convert to A-M or a-m by subtracting 13 from ASCII code #
        code := ABS s[n];
        IF isalpha(s[n])
        THEN
            code +:= (tolower(s[n]) <= "m" | 13 | -13)
        FI;

        t +:= REPR code
    OD;

    t
);

# Get 1st command-line argument. Exit if empty #
STRING s := argv(4);
IF UPB s = 0
THEN
    usage;
    stop
FI;

# Encrypt string with ROT13 and display #
s := rot13(s);
printf(($gl$, s))

Rot13 in Algol68 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

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