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º¯ÊýÃû: abort
¹¦ ÄÜ: Òì³£ÖÕÖ¹Ò»¸ö½ø³Ì
ÓÃ ·¨: void abort(void);
³ÌÐòÀý:
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
printf("Calling abort()\n");
abort();
return 0; /* This is never reached */
}
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: absread, abswirte
¹¦ ÄÜ: ¾ø¶Ô´ÅÅÌÉÈÇø¶Á¡¢Ð´Êý¾Ý
ÓÃ ·¨: int absread(int drive, int nsects, int sectno, void *buffer);
int abswrite(int drive, int nsects, in tsectno, void *buffer);
³ÌÐòÀý:
/* absread example */
#include <stdio.h>
#include <conio.h>
#include <process.h>
#include <dos.h>
int main(void)
{
int i, strt, ch_out, sector;
char buf[512];
printf("Insert a diskette into drive A and press any key\n");
getch();
sector = 0;
if (absread(0, 1, sector, &buf) != 0)
{
perror("Disk problem");
exit(1);
}
printf("Read OK\n");
strt = 3;
for (i=0; i<80; i++)
{
ch_out = buf[strt+i];
putchar(ch_out);
}
printf("\n");
return(0);
}
º¯ÊýÃû: access
¹¦ ÄÜ: È·¶¨ÎļþµÄ·ÃÎÊȨÏÞ
ÓÃ ·¨: int access(const char *filename, int amode);
³ÌÐòÀý:
#include <stdio.h>
#include <io.h>
int file_exists(char *filename);
int main(void)
{
printf("Does NOTEXIST.FIL exist: %s\n",
file_exists("NOTEXISTS.FIL") ? "YES" : "NO");
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atan_self(double x)
{
//atan(x)=x-x^3/3+x^5/5-x^7/7+.....(-1<x<1)
//return:[-pi/2,pi/2]
double mult,sum,xx;
sum=0;
if(x==1){
return pi/4;
}
if(x==-1){
return -pi/4;
}
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