c-excel函数大全

int main(void)
{
printf("Does exist: %s\n",
file_exists("") ? "YES" : "NO");
return 0;
}
int file_exists(char *filename)
{
return (access(filename, 0) == 0);
}
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 = ;
result = acos(x);
printf("The arc cosine of %lf is %lf\n", x, result);
printf("Press any key to halt:");
getch();
exit(1); /* terminate with an error code */
}
midx = getmaxx() / 2;
midy = getmaxy() / 2;
setcolor(getmaxcolor());
return 0;
}
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;
putchar(ch_out);
}
printf("\n");
return(0);
}
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);
}
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\n", number, abs(number));
{
/* 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));
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",
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];
函数大全(a开头)
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()\n");
abort();
return 0; /* This is never reached */
return 0;
}
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);
/* draw arc */
arc(midx, midy, stangle, endangle, radius);
/* clean up */
getch();
closegraph();
return 0;
}
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:
/* absread example */
#include
#include
#include
#wk.baidu.comnclude
int main(void)
{
int i, strt, ch_out, sector;
char buf[512];
printf("Insert a diskette into drive A and press any key\n");
stat);
return 0;
}
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)