What are the major differences between ANSI C and K&R C?

Question

The Wikipedia article on ANSI C says:

One of the aims of the ANSI C standardization process was to produce a superset of K&R C (the first publishe

Answer 1

The major differences between ANSI C and K&R C are as follows:

• function prototyping
• support of the const and volatile data type qualifiers
• support wide characters and internationalization
• permit function pointers to be used without dereferencing

ANSI C adopts c++ function prototype technique where function definition and declaration include function names,arguments' data types, and return value data types. Function prototype enable ANSI C compiler to check for function calls in user programs that pass invalid numbers of arguments or incompatible arguments data types. These fix major weakness of the K&R C compiler.

Example: to declares a function foo and requires that foo take two arguments

 unsigned long foo (char* fmt, double data)
 {
      /*body of foo */
 }