C语言D函数.docVIP

C语言D函数 函数名: delay 功 能: 将程序的执行暂停一段时间(毫秒) 用 法: void delay(unsigned milliseconds); 程序例: /* Emits a 440-Hz tone for 500 milliseconds */ #include dos.h int main(void) { sound(440); delay(500); nosound(); return 0; } 函数名: delline 功 能: 在文本窗口中删去一行 用 法: void delline(void); 程序例: #include conio.h int main(void) { clrscr(); cprintf(The function DELLINE deletes \ the line containing the\r\n); cprintf(cursor and moves all lines \ below it one line up.\r\n); cprintf(DELLINE operates within the \ currently active text\r\n); cprintf(window. Press any key to \ continue . . .); gotoxy(1,2); /* Move the cursor to the second line and first column */ getch(); delline(); getch(); return 0; } 函数名: detectgraph 功 能: 通过检测硬件确定图形驱动程序和模式 用 法: void far detectgraph(int far *graphdriver, int far *graphmode); 程序例: #include graphics.h #include stdlib.h #include stdio.h #include conio.h /* names of the various cards supported */ char *dname[] = { requests detection, a CGA, an MCGA, an EGA, a 64K EGA, a monochrome EGA, an IBM 8514, a Hercules monochrome, an ATT 6300 PC, a VGA, an IBM 3270 PC }; int main(void) { /* returns detected hardware info. */ int gdriver, gmode, errorcode; /* detect graphics hardware available */ detectgraph(gdriver, gmode); /* read result of detectgraph call */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf(Graphics error: %s\n, \ grapherrormsg(errorcode)); printf(Press any key to halt:); getch(); exit(1); /* terminate with an error code */ } /* display the information detected */ clrscr(); printf(You have %s video display \ card.\n, dname[gdriver]); printf(Press any key to halt:); getch(); return 0; } 函数名: difftime 功 能: 计算两个时刻之间的时间差 用 法: double difftime(time_t time2, time_t time1); 程序例