ACM cº¯Êý´óÈ«
º¯ÊýÃû: abs ¹¦ ÄÜ: ÇóÕûÊýµÄ¾ø¶ÔÖµ
ÓÃ ·¨: 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
ÓÃ ·¨: 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
ÓÃ ·¨: 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
ÓÃ ·¨: 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÷
ÓÃ ·¨: 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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CÓïÑÔÖеĴ«Öµ´úÂëÈçÏ£º
int change(int x,int y)
{
int temp=x;
x=y;
y=temp;
}
CÓïÑÔÖеĴ«Ö·´úÂëÈçÏ£º
int change(int *p,int *q)
{
int temp=*p;
*p=*q;
*q=temp;
}
ʹÓÃC++ÖеÄÒýÓÃÀàÐÍ´úÂëÈçÏÂ:
int change(int &x,int &y)
{
int temp=x;
x=y;
y=temp;
}
JAV ......
#include <iostream>
using namespace std;
void main()
{
char *p,*q;
p = "abcde";
q = p + 3;
*q = 't';
cout<<p<<endl;
cout<<q<<endl;
}
Á½ÖÖÓïÑÔ±àÒë¶¼¿ÉÒÔͨ¹ý
µ±Ö´Ðе½
*q = 't';
ʱ£¬C++³ÌÐò³öÏÖÄÚ´æ·ÃÎÊ´íÎó£¬C³ÌÐò¿ÉÒ ......
1.±¾ÕÂ˼άµ¼Í¼£º
Example1:
char
*strcpy(char *target, const char *source) {
char *t = target;
// Copy the contents of source into target.
while(*source) *target++ = *source++;
// Null-terminate the
target.
*ta ......
1.ÏÂÔØlinux kernelÔ´´úÂë
µ½http://www.kernel.org/ÏÂÔØlinuxÄÚºËÔ´´úÂë,ÕâÀïÎÒÃÇʹÓÃ2.6.24.4µÄÄÚºË.
½âѹlinux-2.6.24.4.tar.bz2
[matt@localhost GEC2410]$ tar -xvjf linux-2.6.24.4.tar.bz2
[matt@localhost GEC2410]$ cd linux-2.6.24.4
2.ÐÞ¸ÄMakefile,ÉèÖý»²æ±àÒëÆ÷
ARCH ?= arm
CROSS_COMPILE ......