[C ++ Basics] assert assertions

 

# Include <windows. h> // # define ndebug # include <assert. h> int main () {int n = 9; Assert (n! = 9); // if true, the assertion error will not occur if the expression in assert () is true. assertion failed system ("pause"); Return 0 ;}

Void assert (INT expression); Assert is used to calculate the expression. If its value is false (that is, 0), It prints an error message to stderr first, then terminate the service by calling abort.ProgramRun.
The disadvantage of having to stop using assert () Is that frequent calls will greatly affect program performance and increase additional overhead. After debugging, you can insert a statement that contains # include <assert. h>
# Define ndebugTo disable assert calls.
Purpose and significance: Check the validity of input parameters at the beginning of the function, and use