Differences from GolfScript

While similar to GolfScript in many ways, CJam also has the following differences (probably an incomplete list):

• Support for double (floating point) numbers
• Character type, which also enables a clear distinction between strings and arrays of numbers
• Simplified string syntax, using only double quotes and minimal escaping (similar to single-quoted strings in GolfScript)
• Only standard variables (uppercase letters) can be assigned, and they are initialized with various useful values
• No support for comments; you can write comments as strings and pop them immediately, like this: "This is a comment";.
• The input is not automatically placed on the stack; instead, there are operators for reading the input ("l", "r", "q")
• Support for setting array values (using the "t" operator)
• Support for converting values to specific types (using operators "a", "c", "d", "i", "s")
• Support for "for" loops with a loop variable ("f" operator)
• Support for "do-while" loops that do not pop the condition ("h" operator)
• Support for short map and fold operations (":" operator)
• The "?" (power) operator is renamed to "#"
• The "do" operator is renamed to "g"
• The "if" operator is renamed to "?"
• The "." operator is renamed to "_"; dots are now used for double literals
• The "n" built-in is replaced with the "N" variable (pre-assigned to the newline string)
• The "base" operator is renamed to "b"
• A number of operators are not (yet) implemented, or do not (yet) have all the meanings they have in GolfScript