C Language Memset Learning

#include <stdio.h>#include<memory.h>voidShowinta[][3]);//function DeclarationvoidMain () {inta[][3]={{ at, $, One},{ About, $, the},{ the, -, +},{ One, A, -}};//definition of a two-dimensional arrayShow (a);//a two-dimensional array as a formal parameter, traversing the displayMemset (A,0,sizeof(a));//0 operation for two-dimensional array, i.e. clear 0Show (a); }voidShowinta[][3]){   inti,j;  for(i=0;i<4; i++){         for(j=0;j<3; j + +) {printf ("%d", A[i][j]); } printf ("\ n"); }}

Function: Sets the contents of each byte in a piece of memory pointed by S to the ASCII value specified by CH,

The size of the block is specified by the third parameter, which typically initializes the newly requested memory.

Usage: void *memset (void *s, char ch, unsigned n);

program Example:

#include <string.h>

#include <stdio.h>

#include <memory.h>

int main (void)

{

Char buffer[] = "Hello world/n";

printf ("Buffer before memset:%s/n", buffer);

memset (buffer, ' * ', strlen (buffer));

printf ("Buffer after memset:%s/n", buffer);

return 0;

}

Output Result:

Buffer before Memset:hello World

Buffer after Memset: ***********

In general, all modifications are made to the array, not to Cahr *s= "I am student" because

s points to a read-only memory, and you memset try to modify it, so the runtime to error, modify the method char *s modified to char s[]

C Language Memset Learning