C语言库函数(C类字母之四)

handle = creat("DUMMY.FIL", S_IREAD | S_IWRITE);

/* write 10 bytes to the file */
write(handle, buf, strlen(buf));

/* close the file */
close(handle);
return 0;
}


函数名: creatnew
功 能: 创建一个新文件
用 法: int creatnew(const char *filename, int attrib);
程序例:

#include
#include
#include
#include
#include

int main(void)
{
int handle;
char buf[11] = "0123456789";

/* attempt to create a file that doesn't already exist */
handle = creatnew("DUMMY.FIL", 0);

if (handle == -1)
printf("DUMMY.FIL already exists.\n");
else
{
printf("DUMMY.FIL successfully created.\n");
write(handle, buf, strlen(buf));
close(handle);
}
return 0;
}




函数名: creattemp
功 能: 创建一个新文件或重写一个已存在的文件
用 法: int creattemp(const char *filename, int attrib);
程序例:

#include
#include
#include

int main(void)
{
int handle;
char pathname[128];

strcpy(pathname, "\\");

/* create a unique file in the root directory */
handle = creattemp(pathname, 0);

printf("%s was the unique file created.\n", pathname);
close(handle);
return 0;
}




函数名: cscanf
功 能: 从控制台执行格式化输入
用 法: int cscanf(char *format[,argument, ...]);
程序例:

#include

int main(void)
{
char string[80];

/* clear the screen */
clrscr();

/* Prompt the user for input */
cprintf("Enter a string with no spaces:");

/* read the input */
cscanf("%s", string);

/* display what was read */
cprintf("\r\nThe string entered is: %s", string);
return 0;
}




函数名: ctime
功 能: 把日期和时间转换为字符串
用 法: char *ctime(const time_t *time);
程序例:

#include
#include

int main(void)
{
time_t t;

time(&t);
printf("Today's date and time: %s\n", ctime(&t));
return 0;
}




函数名: ctrlbrk
功 能: 设置Ctrl-Break处理程序
用 法: void ctrlbrk(*fptr)(void);
程序例:

#include
#include

#define ABORT 0

int c_break(void)
{
printf("Control-Break pressed. Program aborting ...\n");
return (ABORT);
}

int main(void)
{
ctrlbrk(c_break);
for(;;)
{
printf("Looping... Press to quit:\n");
}
return 0;
}