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This article mainly explains "how to use the assert function in the c language". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to use the assert function in the c language".

1. Assert will determine whether the execution program needs to be terminated by checking the value of the expression expresion.

2. If the value of the expression expresion is false (that is, 0), it will first print the error message to the standard error stream stderr.

The program is terminated by calling the abort function. Otherwise, assert has no effect.

Example

# include # include # include int main (void) {FILE * fp; fp = fopen ("456.txt", "w"); / / Open a file in a writable manner, and create a file with the same name assert (fp) if it does not exist; / / so there is no error fclose (fp); fp = fopen ("123.txt", "r") / / Open a file as read-only. If it does not exist, it fails to open the file assert (fp); / / so there is an error fclose (fp); / / the program will never be executed here to return 0 Thank you for your reading. The above is the content of "how to use the assert function in c language". After the study of this article, I believe you have a deeper understanding of how to use the assert function in c language, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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