How to use fopen function in C language

This article will explain in detail how to use the fopen function in c language. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

1. The C language fopen function means to open a file in the specified mode.

2. The fopen function and the fclose function always appear in pairs. If the file is opened successfully using the fopen function, remember to use the fclose function to close the file.

Example

# include # include int main () {/ / if D:/file.txt exists, fopen is opened successfully, otherwise failure returns NULL FILE * fp = fopen ("d://file.txt", "r"); if (! fp) printf ("file opening failed"); else {printf ("file opened successfully") Fclose (fp); / / if the file opens successfully remember to close} return (0);} on "how to use the fopen function in the c language" this article is shared here, I hope the above content can be of some help to you, so that you can learn more knowledge, if you think the article is good, please share it out for more people to see.