| C语言库函数(C类字母) |
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| 作者:未知 文章来源:网络收集 点击数: 更新时间:2006-3-29 15:22:24
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/* display some messages */ outtextxy(0, 0, "* <-- (0, 0) in smaller viewport"); outtextxy(0, 2*ht, "Press any key to clear viewport:");
/* wait for a key */ getch();
/* clear the viewport */ clearviewport();
/* output another message */ outtextxy(0, 0, "Press any key to quit:");
/* clean up */ getch(); closegraph(); return 0; }
函数名: _close, close 功 能: 关闭文件句柄 用 法: int close(int handle); 程序例:
#include #include #include #include
main() { int handle; char buf[11] = "0123456789";
/* create a file containing 10 bytes */ handle = open("NEW.FIL", O_CREAT); if (handle > -1) { write(handle, buf, strlen(buf));
/* close the file */ close(handle); } else { printf("Error opening file\n"); } return 0; }
函数名: clock 功 能: 确定处理器时间 用 法: clock_t clock(void); 程序例:
#include #include #include
int main(void) { clock_t start, end; start = clock();
delay(2000);
end = clock(); printf("The time was: %f\n", (end - start) / CLK_TCK);
return 0; }
函数名: closegraph 功 能: 关闭图形系统 用 法: void far closegraph(void); 程序例:
#include #include #include #include
int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int x, y;
/* initialize graphics mode */ initgraph(&gdriver, &gmode, "");
/* read result of initialization */ errorcode = graphresult();
if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\n", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch上一页 [1] [2] [3] [4] [5] [6] [7] [8] [9] 下一页
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