assert.h is a header file in the standard library of the C programming language that defines the C preprocessor macro assert(). The macro implements an assertion, which can be used to verify assumptions made by the program and print a diagnostic message if this assumption is false. In C++ it is also available through the cassert header file.

assert.h is a header file in the standard library of the C programming language that defines the C preprocessor macro assert(). The macro implements an assertion, which can be used to verify assumptions made by the program and print a diagnostic message if this assumption is false. In C++ it is also available through the cassert header file.