C language library function strtol fprintf memcpy memset sizeof

Strtol

Convert the string A, B, and C into numbers in hexadecimal notation (10, 2, 16 ).

# Include
Main ()

Char A [] = "1000000000 ";

Char B [] = "1000000000 ";

Char C [] = "FFFF ";
Printf ("A = % d/N", strtol (A, null, 10 ));

Printf ("B = % d/N", strtol (B, null, 2 ));
Printf ("C = % d/N", strtol (C, null, 16 ));

A = 1000000000

B = 512
C = 65535.

 

 

Fprintf:

Can be output to more types of devices, not just as printf defaults to stdout

 

Memcpy (& H-> param, Param, sizeof (x264_param_t); returns the start space directed by the param pointer to the number of param copy byte to sizeof ()

Memset sets the param value to the & H-> param address sizeof times.

 

Sizeof ()

Number of returned bytes