C语言库函数(G类字母) - 1

#include <stdio.h>
#include <dos.h>

int main(void)
{
if (getcbrk())
printf("Cntrl-brk flag is on\n");
else
printf("Cntrl-brk flag is off\n");

return 0;
}



函数名: getch
功 能: 从控制台无回显地取一个字符
用 法: int getch(void);
程序例:

#include <stdio.h>
#include <conio.h>

int main(void)
{
char ch;

printf("Input a character:");
ch = getche();
printf("\nYou input a '%c'\n", ch);
return 0;
}



函数名: getchar
功 能: 从stdin流中读字符
用 法: int getchar(void);
程序例:

#include <stdio.h>

int main(void)
{
int c;

/* Note that getchar reads from stdin and
is line buffered; this means it will
not return until you press ENTER. */

while ((c = getchar()) != '\n')
printf("%c", c);

return 0;
}



函数名: getche
功 能: 从控制台取字符(带回显)
用 法: int getche(void);
程序例:

#include <stdio.h>
#include <conio.h>

int main(void)
{
char ch;

printf("Input a character:");
ch = getche();
printf("\nYou input a '%c'\n", ch);
return 0;
}



函数名: getcolor
功 能: 返回当前画线颜色
用 法: int far getcolor(void);
程序例:

#include <graphics.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <conio.h>

int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int color, midx, midy;
char colname[35];

/* 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();
/* terminate with an error code */
exit(1);
}

midx = getmaxx() / 2;
midy = getmaxy() / 2;
setcolor(getmaxcolor());

/* for centering text on the display */
settextjustify(CENTER_TEXT, CENTER_TEXT);

/* get the current drawing color */
color = getcolor();

/* convert color value into a string */
itoa(color, colname, 10);
strcat(colname,
" is the current drawing color.");

/* display a message */
outtextxy(midx, midy, colname);

/* clean up */
getch();
closegraph();
return 0;
}



函数名: getcurdir
功 能: 取指定驱动器的当前目录
用 法: int getcurdir(int drive, char *direc);
程序例:

#include <dir.h>
#include <stdio.h>
#include <string.h>

char *current_directory(char *path)
{
strcpy(path, "X:\\"); /* fill string with form of response: X:\ */
path[0] = 'A' + getdisk(); /* replace X with current drive letter */
getcurdir(0, path+3); /* fill rest of string with current directory */
return(path);
}

int main(void)
{
char curdir[MAXPATH];

current_directory(curdir);
printf("The current directory is %s\n", curdir);

return 0;
}



函数名: getcwd
功 能: 取当前工作目录
用 法: char *getcwd(char *buf, int n);
程序例:

#include <stdio.h>
#include <dir.h>

int main(void)
{
char buffer[MAXPATH];

getcwd(buffer, MAXPATH);
printf("The current directory is: %s\n", buffer);
return 0;
}