How

CodePudding user response:

The code posted

CodePudding user response:

Errno_t err;
If ((err=fopen_s (& amp; Fp, "contact. TXT", "b"))==0)

Have a try

CodePudding user response:

The first parameter to the Open function sites & amp;

CodePudding user response:

The

reference 3 floor mzhan017 response:

sites the first parameter to the Open function & amp;

Function prototypes: the FILE * fopen (const char * path, const char * mode).
And to add the path