Zilog ZUSBOPTS Manual do Utilizador descarregar pdf (Página 463)

100

101

UM017105-0511 Standard Functions

Zilog Developer Studio II – ZNEO™

User Manual

435

Example

int lst[]={5,8,2,9};

int compare (const void * x, const void * y);

qsort (lst, sizeof(int), 4, compare);

int compare (const void * x, const void * y)

{

int a = *(int *) x;

int b = *(int *) y;

if (a < b) return -1;

if (a == b)return 0;

return 1;

}

The compare function prototype is, as shown in the preceding example:

int compare (const void * x, const void * y);

rand

Computes a sequence of pseudorandom integers in the range 0 to RAND_MAX.

Synopsis

#include <stdlib.h>

int rand(void);

Returns

A pseudorandom integer.

Example

int i;

srand(1001);

i=rand();

realloc

Changes the size of the object pointed to by ptr to the size specified by size. The contents

of the object are unchanged up to the lesser of the new and old sizes. If ptr is a null pointer,

the

realloc function behaves in a similar fashion to the malloc function for the speci-

fied size. Otherwise, if ptr does not match a pointer earlier returned by the

calloc, mal-

loc

, or realloc function, or if the space has been deallocated by a call to the free or

realloc function, the behavior is undefined. If the space cannot be allocated, the real-

loc

function returns a null pointer and the object pointed to by ptr is unchanged. If size is

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