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 C±ê×¼¿âÍ·Îļþ assert.h
@º¯ÊýÃû³Æ:   assert
º¯ÊýÔ­ÐÍ:   void assert(int exp)
º¯Êý¹¦ÄÜ:   Õï¶ÏÀࣺ±í´ïʽ½á¹ûÕýÈ·ÐÔ²âÊÔ²¢¿Éʹ³ÌÐòÖÐÖ¹
º¯Êý·µ»Ø:  
²ÎÊý˵Ã÷:   ½«´íÎóÐÅÏ¢Êä³öµ½Á÷stderrÖУ¬Èç¹ûexpΪ0£¬ÔòÖÐÖ¹³ÌÐòÖ´ÐÐ.exp-±í´ïʽ
ËùÊôÎļþ:   <assert.h>
#include <stdio.h>
#include <assert.h>
void process_string(char *string)
{
  /* use assert to check argument */
  assert(string!=NULL);
  assert(*string!='\0');
  /* rest of code follows here */
}
int main()
{
  process_string("hello");
  process_string("");
  return 0;
}
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#include <ctype.h>
int isspace ( int c );
http://www.cplusplus.com/reference/clibrary/cctype/isspace/
Checks if parameter c is a white-space character.For the purpose of this function, standard white-space characters are:
' '
(0x20)
space (SPC)
'\t'
(0x09)
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