c语言函数大全

墙角野猫

c语言函数大全 索引

a开头1 楼

b开头18 楼

c开头31 楼

d开头59 楼

e开头69 楼

f开头74 楼

g开头75 楼

h开头130 楼

i开头134 楼

j开头

k开头150 楼

l开头153 楼

m开头170 楼

n开头188 楼

o开头190 楼

p开头195 楼

q开头215 楼

r开头217 楼

s开头232 楼

t开头313 楼

u开头329 楼

v开头335 楼

w开头341 楼

x开头

y开头

z开头

墙角野猫

函数名: abort
功 能: 异常终止一个进程
用 法: void abort(void);
程序例:
#include
#include
int main(void)
{
printf("Calling abort()
");
abort();
return 0; /* This is never reached */
}

墙角野猫

函数名: abs
功 能: 求整数的绝对值
用 法: int abs(int i);
程序例:
#include
#include
int main(void)
{
int number = -1234;
printf("number: %d absolute value: %d
", number, abs(number));
return 0;
}

墙角野猫

函数名: absread, abswirte
功 能: 绝对磁盘扇区读、写数据
用 法: int absread(int drive, int nsects, int sectno, void *buffer);
int abswrite(int drive, int nsects, in tsectno, void *buffer);
程序例:
/* absread example */
#include
#include
#include
#include
int main(void)
{
int i, strt, ch_out, sector;
char buf[512];
printf("Insert a diskette into drive A and press any key
");
getch();
sector = 0;
if (absread(0, 1, sector, &buf) != 0)
{
perror("Disk problem");
exit(1);
}
printf("Read OK
");
strt = 3;
for (i=0; i<80; i++)
{
ch_out = buf[strt+i];
putchar(ch_out);
}
printf("
");
return(0);
}

墙角野猫

函数名: access
功 能: 确定文件的访问权限
用 法: int access(const char *filename, int amode);
程序例:
#include
#include
int file_exists(char *filename);
int main(void)
{
printf("Does NOTEXIST.FIL exist: %s
",
file_exists("NOTEXISTS.FIL") ? "YES" : "NO");
return 0;
}
int file_exists(char *filename)
{
return (access(filename, 0)== 0);
}

墙角野猫

函数名: acos
功 能: 反余弦函数
用 法: double acos(double x);
程序例:
#include
#include
int main(void)
{
double result;
double x = 0.5;
result = acos(x);
printf("The arc cosine of %lf is %lf
", x, result);
return 0;
}

墙角野猫

函数名: acos
功 能: 反余弦函数
用 法: double acos(double x);
程序例:
#include
#include
int main(void)
{
double result;
double x = 0.5;
result = acos(x);
printf("The arc cosine of %lf is %lf
", x, result);
return 0;
}

墙角野猫

函数名: allocmem
功 能: 分配DOS存储段
用 法: int allocmem(unsigned size, unsigned *seg);
程序例:
#include
#include
#include
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
", segp);
else
printf("Failed: maximum number of paragraphs available is %u
",
stat);
return 0;
}

墙角野猫

函数名: arc
功 能: 画一弧线
用 法: void far arc(int x, int y, int stangle, int endangle, int radius);
程序例:
#include
#include
#include
#include
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
", 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;
}

墙角野猫

函数名: asctime
功 能: 转换日期和时间为ASCII码
用 法: char *asctime(const struct tm *tblock);
程序例:
#include
#include
#include
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
", str);
return 0;
}