BCPL was the first brace programming language and the braces survived the syntactical changes and have become a common means of denoting program source code statements. In practice, on limited keyboards of the day, source programs often used the sequences $( and $) or [ and ] in place of the symbols { and }. The single-line // comments of BCPL, which were not adopted by C, reappeared in C++ and later in C99.
BCPL was the first brace programming language and the braces survived the syntactical changes and have become a common means of denoting program source code statements. In practice on limited keyboards of the day, source programs often used the sequences $( and $) or [ and ] in place of the symbols { and }. The single-line // comments of BCPL, which were not adopted by C, reappeared in C++ and later in C99.