![[ ッ环UNIX::UNIXм砃戈腳畐 ]](/images/title.gif) GB | BIG5
|
| > 絪祘м砃 > C/C++ > タゅ |
 |
| C粂ē畐ㄧ计(A摸ダ) |
| セゅ:http://www.asfocus.com : (2001-07-27 07:00:00) |
ㄧ计: abort
: 钵盽沧ゎ秈祘
ノ 猭: void abort(void);
祘ㄒ:
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
printf("Calling abort()\n");
abort();
return 0; /* This is never reached */
}
ㄧ计: abs
: ―俱计荡癸
ノ 猭: int abs(int i);
祘ㄒ:
#include <stdio.h>
#include <math.h>
int main(void)
{
int number = -1234;
printf("number: %d absolute value: %d\n", number, abs(number));
return 0;
}
ㄧ计: absread, abswirte
: 荡癸合絃跋弄糶计沮
ノ 猭: int absread(int drive, int nsects, int sectno, void *buffer);
int abswrite(int drive, int nsects, in tsectno, void *buffer);
祘ㄒ:
/* 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);
}
ㄧ计: access
: 絋﹚ゅン砐拜舦
ノ 猭: int access(const char *filename, int amode);
祘ㄒ:
#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");
return 0;
}
int file_exists(char *filename)
{
return (access(filename, 0) == 0);
}
ㄧ计: acos
: は┒ㄧ计
ノ 猭: double acos(double x);
祘ㄒ:
#include <stdio.h>
#include <math.h>
int main(void)
{
double result;
double x = 0.5;
result = acos(x);
printf("The arc cosine of %lf is %lf\n", x, result);
return 0;
}
ㄧ计: allocmem
: だ皌DOS纗琿
ノ 猭: int allocmem(unsigned size, unsigned *seg);
祘ㄒ:
#include <dos.h>
#include <alloc.h>
#include <stdio.h>
int main(void)
{
unsigned int size, segp;
int stat;
size = 64; /* (64 x 16) = 1024 bytes */
stat = allocmem(size, &segp);
if (stat == -1)
printf("Allocated memory at segment: %x\n", segp);
else
printf("Failed: maximum number of paragraphs available is %u\n",
stat);
return 0;
}
ㄧ计: arc
: 礶┓絬
ノ 猭: void far arc(int x, int y, int stangle, int endangle, int radius);
祘ㄒ:
#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int midx, midy;
int stangle = 45, endangle = 135;
int radius = 100;
/* initialize graphics and local variables */
initgraph(&gdriver, &gmode, "");
/* read result of initialization */
errorcode = graphresult(); /* an error occurred */
if (errorcode != grOk)
{
printf("Graphics error: %s\n", grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
exit(1); /* terminate with an error code */
}
midx = getmaxx() / 2;
midy = getmaxy() / 2;
setcolor(getmaxcolor());
/* draw arc */
arc(midx, midy, stangle, endangle, radius);
/* clean up */
getch();
closegraph();
return 0;
}
ㄧ计: asctime
: 锣传ら戳㎝丁ASCII絏
ノ 猭: char *asctime(const struct tm *tblock);
祘ㄒ:
#include <stdio.h>
#include <string.h>
#include <time.h>
int main(void)
{
struct tm t;
char str[80];
/* sample loading of tm structure */
t.tm_sec = 1; /* Seconds */
t.tm_min = 30; /* Minutes */
t.tm_hour = 9; /* Hour */
t.tm_mday = 22; /* Day of the Month */
t.tm_mon = 11; /* Month */
t.tm_year = 56; /* Year - does not include century */
t.tm_wday = 4; /* Day of the week */
t.tm_yday = 0; /* Does not show in asctime */
t.tm_isdst = 0; /* Is Daylight SavTime; does not show in asctime */
/* converts structure to null terminated
string */
strcpy(str, asctime(&t));
printf("%s\n", str);
return 0;
}
ㄧ计: asin
: はタ┒ㄧ计
ノ 猭: double asin(double x);
祘ㄒ:
#include <stdio.h>
#include <math.h>
int main(void)
{
double result;
double x = 0.5;
result = asin(x);
printf("The arc sin of %lf is %lf\n", x, result);
return(0);
}
ㄧ计: assert
: 代刚兵ンㄏ祘沧ゎ
ノ 猭: void assert(int test);
祘ㄒ:
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
struct ITEM {
int key;
int value;
};
/* add item to list, make sure list is not null */
void additem(struct ITEM *itemptr) {
assert(itemptr != NULL);
/* add item to list */
}
int main(void)
{
additem(NULL);
return 0;
}
ㄧ计: atan
: はタちㄧ计
ノ 猭: double atan(double x);
祘ㄒ:
#include <stdio.h>
#include <math.h>
int main(void)
{
double result;
double x = 0.5;
result = atan(x);
printf("The arc tangent of %lf is %lf\n", x, result);
return(0);
}
ㄧ计: atan2
: 璸衡Y/Xはタち
ノ 猭: double atan2(double y, double x);
祘ㄒ:
#include <stdio.h>
#include <math.h>
int main(void)
{
double result;
double x = 90.0, y = 45.0;
result = atan2(y, x);
printf("The arc tangent ratio of %lf is %lf\n", (y / x), result);
return 0;
}
ㄧ计: atexit
: 猔沧ゎㄧ计
ノ 猭: int atexit(atexit_t func);
祘ㄒ:
#include <stdio.h>
#include <stdlib.h>
void exit_fn1(void)
{
printf("Exit function #1 called\n");
}
void exit_fn2(void)
{
printf("Exit function #2 called\n");
}
int main(void)
{
/* post exit function #1 */
atexit(exit_fn1);
/* post exit function #2 */
atexit(exit_fn2);
return 0;
}
ㄧ计: atof
: р才﹃锣传Θ疊翴计
ノ 猭: double atof(const char *nptr);
祘ㄒ:
#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;
}
ㄧ计: atoi
: р才﹃锣传Θ俱计
ノ 猭: int atoi(const char *nptr);
祘ㄒ:
#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;
}
ㄧ计: atol
: р才﹃锣传Θ俱计
ノ 猭: long atol(const char *nptr);
祘ㄒ:
#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);
}
(http://www.fanqiang.com)
秈UNIX阶韭
|
|
| 闽ゅ彻 |
|
|
|
|
|
」 荚眏 舧だㄉ 」 |