Rot13 in Algol68

Published on 28 April 2022 (Updated: 02 February 2023)

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:

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

Note: The solution shown above is the current solution in the Sample Programs repository as of Feb 01 2023 12:00:13. The solution was first committed on Jan 24 2023 12:24:28. As a result, documentation below may be outdated.

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.