Difference between Modern C and Traditional C(Difference
between C and ANSI C)
— C
was originally developed by Dennis Ritchie at AT&T Bell Labs between 1969
and 1973.
— It
has a free-format program source code. C is a general-purpose programming
language. C is one of the oldest currently used programming languages and is
one of the most widely used programming languages.
— ANSI
C is a set of successive standards which were published by the American
National Standards Institute (ANSI) for the C programming language. The ANSI
specifies the syntax and semantics of programs written in C.
— Function
prototypes must be declared without a list of arguments and types, and consist
of the type, function name and an empty set of parentheses.
— C
converts all float types in an expression to double precision types. The type
signed char is not available in C, but is in ANSI C. In C, type void is not
available.
— In
C, functions are assumed to return integer if they return nothing. Many old C
compilers expect that the first character of a pre-processor directive line is a
#.
— No
leading white space is allowed In C, the signed type qualifier is not
available. In C, the unsigned qualifier can be used to qualify integer types
only. In C, the unary positive sign is not allowed.
— In
C, the type long double is not available. In C, the const qualifier is not
available. In C, enumeration type is not available. Automatic arrays cannot be
initialized in declarations in C. Only external and static arrays can be
initialized.
— Automatic
structures and arrays of structures cannot be initialized in declarations in C.
— In
C, Some old compilers may not allow references to entire structures, requiring
the use of structure pointers or individual structure members.
Thank you
-Rushita
Goswami
