Beginning C++17 by Ivor Horton & Peter Van Weert

Author:Ivor Horton & Peter Van Weert
Language: eng
Format: epub
Publisher: Apress, Berkeley, CA

Using the assert() Macro

The assert() preprocessor macro is defined in the Standard Library header cassert. This enables you to test logical expressions in your program. Including a line of the form assert(expression) results in code that causes the program to be terminated with a diagnostic message if expression evaluates to false. We can demonstrate this with this simple example:

// Ex10_09.cpp

// Demonstrating assertions

#include <iostream>

#include <cassert>

int main()

{

int y {5};

for (int x {}; x < 20; ++x)

{

std::cout << "x = " << x << " y = " << y << std::endl;

assert(x < y);

}

}

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