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<PRE> </PRE>
<PRE>函数大全(u开头)
</PRE>
<PRE>函数名:<font size="5" color="#FF0000"> ultoa </font>
功 能: 转换一个无符号长整型数为字符串
用 法: char *ultoa(unsigned long value, char *string, int radix);
程序例: </PRE>
<PRE>#include
#include </PRE>
<PRE>int main( void )
{
unsigned long lnumber = 3123456789L;
char string[25]; </PRE>
<PRE>ultoa(lnumber,string,10);
printf("string = %s unsigned long = %lu\n",string,lnumber); </PRE>
<PRE>return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">ungetc </font>
功 能: 把一个字符退回到输入流中
用 法: int ungetc(char c, FILE *stream);
程序例: </PRE>
<PRE>#include
#include </PRE>
<PRE>int main( void )
{
int i=0;
char ch; </PRE>
<PRE>puts("Input an integer followed by a char:"); </PRE>
<PRE>/* read chars until non digit or EOF */
while((ch = getchar()) != EOF && isdigit(ch))
i = 10 * i + ch - 48; /* convert ASCII into int value */ </PRE>
<PRE>/* if non digit char was read, push it back into input buffer */
if (ch != EOF)
ungetc(ch, stdin); </PRE>
<PRE>printf("i = %d, next char in buffer = %c\n", i, getchar());
return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">ungetch </font>
功 能: 把一个字符退回到键盘缓冲区中
用 法: int ungetch(int c);
程序例: </PRE>
<PRE>#include
#include
#include </PRE>
<PRE>int main( void )
{
int i=0;
char ch; </PRE>
<PRE>puts("Input an integer followed by a char:"); </PRE>
<PRE>/* read chars until non digit or EOF */
while((ch = getche()) != EOF && isdigit(ch))
i = 10 * i + ch - 48; /* convert ASCII into int value */ </PRE>
<PRE>/* if non digit char was read, push it back into input buffer */
if (ch != EOF)
ungetch(ch); </PRE>
<PRE>printf("\n\ni = %d, next char in buffer = %c\n", i, getch());
return 0;
}
</PRE>
<PRE>函数名:<font size="5" color="#FF0000"> unixtodos </font>
功 能: 把日期和时间转换成DOS格式
用 法: void unixtodos(long utime, struct date *dateptr,
struct time *timeptr);
程序例: </PRE>
<PRE>#include
#include </PRE>
<PRE>char *month[] = {"---", "Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}; </PRE>
<PRE>#define SECONDS_PER_DAY 86400L /* the number of seconds in one day */ </PRE>
<PRE>struct date dt;
struct time tm; </PRE>
<PRE>int main(void)
{
unsigned long val; </PRE>
<PRE>/* get today's date and time */
getdate(&dt);
gettime(&tm);
printf("today is %d %s %d\n", dt.da_day, month[dt.da_mon], dt.da_year); </PRE>
<PRE>/* convert date and time to unix format (number of seconds since Jan 1, 1970 */
val = dostounix(&dt, &tm);
/* subtract 42 days worth of seconds */
val -= (SECONDS_PER_DAY * 42); </PRE>
<PRE>/* convert back to dos time and date */
unixtodos(val, &dt, &tm);
printf("42 days ago it was %d %s %d\n",
dt.da_day, month[dt.da_mon], dt.da_year);
return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">unlink </font>
功 能: 删掉一个文件
用 法: int unlink(char *filename);
程序例: </PRE>
<PRE>#include
#include </PRE>
<PRE>int main(void)
{
FILE *fp = fopen("junk.jnk","w");
int status; </PRE>
<PRE>fprintf(fp,"junk"); </PRE>
<PRE>status = access("junk.jnk",0);
if (status == 0)
printf("File exists\n");
else
printf("File doesn't exist\n"); </PRE>
<PRE>fclose(fp);
unlink("junk.jnk");
status = access("junk.jnk",0);
if (status == 0)
printf("File exists\n");
else
printf("File doesn't exist\n");
</PRE>
<PRE>return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">unlock </font>
功 能: 解除文件共享锁
用 法: int unlock(int handle, long offset, long length);
程序例: </PRE>
<PRE>#include
#include
#include
#include
#include
#include </PRE>
<PRE>int main(void)
{
int handle, status;
long length; </PRE>
<PRE>handle = sopen("c:\\autoexec.bat",O_RDONLY,SH_DENYNO,S_IREAD); </PRE>
<PRE>if (handle < 0)
{
printf("sopen failed\n");
exit(1);
} </PRE>
<PRE>length = filelength(handle);
status = lock(handle,0L,length/2); </PRE>
<PRE>if (status == 0)
printf("lock succeeded\n");
else
printf("lock failed\n"); </PRE>
<PRE>status = unlock(handle,0L,length/2); </PRE>
<PRE>if (status == 0)
printf("unlock succeeded\n");
else
printf("unlock failed\n"); </PRE>
<PRE>close(handle);
return 0;
}
</PRE>
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<PRE>
</PRE>
<pre>资料收集：beck Copyright 2004 张求熙, All Rights Reserved</pre>
<pre><a href="mailto:Email:qiuxi1984@126.com">Email:qiuxi1984@126.com</a> QQ:35540948 </pre>
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