Editing System programming language (section)

===Higher-level languages===
While PL360 is at the semantic level of assembly language, another kind of system programming language operates at a higher semantic level, but has specific extensions designed to make the language suitable for system programming. An early example of this kind of language is LRLTRAN,<ref>{{Cite journal |last1=Mendicino |first1=Sam F. |last2=Hughes |first2=Robert A. |last3=Martin |first3=Jeanne T. |last4=McMahon |first4=Frank H. |last5=Ranelletti |first5=John E. |last6=Zwakenberg |first6=Richard G. |title=The LRLTRAN Compiler |journal=Communications of the ACM |date=1968 |volume=11 |issue=11 |pages=747–755|doi=10.1145/364139.364154 }}</ref> which extended Fortran with features for character and bit manipulation, pointers, and directly addressed jump tables.

Subsequently, languages such as C were developed, where the combination of features was sufficient to write system software, and a [[compiler]] could be developed that generated efficient object programs on modest hardware. Such a language generally omits features that cannot be implemented efficiently, and adds a small number of machine-dependent features needed to access specific hardware abilities; [[inline assembly]] code, such as C's {{code|lang=c|asm}} statement, is often used for this purpose. Although many such languages were developed,<ref name="MOHLconfer"/> C and [[C++]] are the ones which survived.