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Meaning of WEAK TYPING

Computing Dictionary

Strict enforcement of type rules but with well-defined exceptions or an explicit type-violation mechanism.

Weak typing is "friendlier" to the programmer than strong typing, but catches fewer errors at compile time.

c and c++ are weakly typed, as they automatically coerce many types e.g. ints and floats. E.g.

 int a = 5;
 float b = a;

They also allow ignore typedefs for the purposes of type comparison; for example the following is allowed, which would probably be disallowed in a strongly typed language:

typedef int Date; /* Type to represent a date */

Date a = 12345;

int b = a; /* What does the coder intend? */

C++ is stricter than C in its handling of enumerated types:

enum animal cat=0,dog=2,ant=3;

enum animal a = CAT; /* NB The enum is optional in C++ */

enum animal b = 1; /* This is a warning or error in C++ */