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º¯ÊýÃû: abs ¹¦  ÄÜ: ÇóÕûÊýµÄ¾ø¶ÔÖµ
Óà ·¨: int abs(int i);
³ÌÐòÀý:
#include <stdio.h>
#include <math.h>
int main(void)
{
  int number = -1234;
  printf("number: %d  absolute value: %d\n", number, abs(number));
  return 0;
}
º¯ÊýÃû: atof
¹¦  ÄÜ: °Ñ×Ö·û´®×ª»»³É¸¡µãÊý
Óà ·¨: double atof(const char *nptr);
³ÌÐòÀý:
#include <stdlib.h>
#include <stdio.h>
int main(void)
{
   float f;
   char *str = "12345.67";
   f = atof(str);
   printf("string = %s float = %f\n", str, f);
   return 0;
}
º¯ÊýÃû: atoi
¹¦  ÄÜ: °Ñ×Ö·û´®×ª»»³É³¤ÕûÐÍÊý
Óà ·¨: int atoi(const char *nptr);
³ÌÐòÀý:
#include <stdlib.h>
#include <stdio.h>
int main(void)
{
   int n;
   char *str = "12345.67";
   n = atoi(str);
   printf("string = %s integer = %d\n", str, n);
   return 0;
}
º¯ÊýÃû: atol
¹¦  ÄÜ: °Ñ×Ö·û´®×ª»»³É³¤ÕûÐÍÊý
Óà ·¨: long atol(const char *nptr);
³ÌÐòÀý:
#include <stdlib.h>
#include <stdio.h>
int main(void)
{
   long l;
   char *str = "98765432";
   l = atol(lstr);
   printf("string = %s integer = %ld\n", str, l);
   return(0);
}
º¯ÊýÃû: bsearch
¹¦  ÄÜ: ¶þ·Ö·¨ËÑË÷
Óà ·¨: void *bsearch(const void *key, const void *base, size_t *nelem,  size_t width, int(*fcmp)(const void *, const *));
³ÌÐòÀý:
#include <stdlib.h>
#include <stdio.h>
#define NELEMS(arr) (sizeof(arr) / sizeof(arr[0]))
int numarray[] = {123, 145, 512, 627, 800, 933};
int numeric (const int *p1, const int *p2)
{
   return(*p1 - *p2);
}
int lookup(int key)
{
   int *itemptr;
   /* The cast of (int(*)(const void *,const void*))
      is needed to avoid a type mismatch error at
      compile time */
 &


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int func(x)
{
int countx = 0;
while(x)
{
countx
++;
x = x&(x-1);
}
return countx;
}
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#include<stdio.h>
int f(int *);
int main()
{
int *p,a[10];
for(p=a;p<a+10;p++)
scanf("%d",p);
f(a);
for(p=a;p<a+10;p++)
printf("%d ",*p);
return 0;
}
int f(int *a)
{
int i,*p ......

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B/S C/S


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Cº¯Êý¿â½éÉÜ: string.h¡¢mem.h

²Ù×÷º¯Êý,ËùÔÚº¯Êý¿âΪstring.h¡¢mem.h
mem…²Ù×÷´æÖüÊý×é
void *memccpy(void *destin,void *source,unsigned char ch,unsigned n)
void *memchr(void *s,char ch,unsigned n)
void *memcmp(void *s1,void *s2,unsigned n)
int   memicmp(void *s1,void *s2,unsigned n)
void *memmove(void *destin ......
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