C语言函数大全(p开头)

函数名: parsfnm

功能: 分析文件名

用法: char *parsfnm (char *cmdline, struct fcb *fcbptr, int option);

程序例:

#include
#include
#include
#include
int main(void)
{
char line[80];
struct fcb blk;
/* get file name */
printf("Enter drive and file name (no path - ie. a:file.dat)\n");
gets(line);
/* put file name in fcb */
if (parsfnm(line, &blk, 1) == NULL)
printf("Error in parsfm call\n");
else
printf("Drive #%d Name: %11s\n", blk.fcb_drive, blk.fcb_name);
return 0;
}

函数名: peek

功能: 检查存储单元

用法: int peek(int segment, unsigned offset);

程序例:

#include
#include
#include
int main(void)
{
int value = 0;
printf("The current status of your keyboard is:\n");
value = peek(0x0040, 0x0017);
if (value & 1)
printf("Right shift on\n");
else
printf("Right shift off\n");
if (value & 2)
printf("Left shift on\n");
else
printf("Left shift off\n");
if (value & 4)
printf("Control key on\n");
else
printf("Control key off\n");
if (value & 8)
printf("Alt key on\n");
else
printf("Alt key off\n");
if (value & 16)
printf("Scroll lock on\n");
else
printf("Scroll lock off\n");
if (value & 32)
printf("Num lock on\n");
else
printf("Num lock off\n");
if (value & 64)
printf("Caps lock on\n");
else
printf("Caps lock off\n");
return 0;
}

时间： 2024-08-22 14:07:49

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C语言函数大全(a开头)

函数名: abort 功能: 异常终止一个进程 用法: void abort(void); 程序例: #include #include int main(void) { printf("Calling abort()\n"); abort(); return 0; /* This is never reached */ } 函数名: abs 功能: 求整数的绝对值 用法: int abs(int i); 程序例: #include #include int main(void) {

C语言函数大全(b开头)

函数名: bar 功能: 画一个二维条形图 用法: void far bar(int left, int top, int right, int bottom); 程序例: #include #include #include #include int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int midx, midy, i; /* initialize graphics

C语言函数大全(c开头)

函数名: cabs 功能: 计算复数的绝对值 用法: double cabs(struct complex z); 程序例: #include #include int main(void) { struct complex z; double val; z.x = 2.0; z.y = 1.0; val = cabs(z); printf("The absolute value of %.2lfi %.2lfj is %.2lf", z.x, z.y, val); return 0;

C语言函数大全(d开头)

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 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

C语言函数大全(e开头)

函数名: ecvt 功能: 把一个浮点数转换为字符串 用法: char ecvt(double value, int ndigit, int *decpt, int *sign); 程序例: #include #include #include int main(void) { char *string; double value; int dec, sign; int ndig = 10; clrscr(); value = 9.876; string = ecvt(value, ndig,

C语言函数大全(g开头)

函数名: gcvt 功能: 把浮点数转换成字符串 用法: char *gcvt(double value, int ndigit, char *buf); 程序例: #include #include int main(void) { char str[25]; double num; int sig = 5; /* significant digits */ /* a regular number */ num = 9.876; gcvt(num, sig, str); printf("str

C语言函数大全(h开头)

函数名: harderr 功能: 建立一个硬件错误处理程序 用法: void harderr(int (*fptr)()); 程序例: /*This program will trap disk errors and prompt the user for action. Try running it with no disk in drive A: to invoke its functions.*/ #include #include #include #define IGNORE 0 #d

C语言函数大全(i开头)

函数名: imagesize 功能: 返回保存位图像所需的字节数 用法: unsigned far imagesize(int left, int top, int right, int bottom); 程序例: #include #include #include #include #define ARROW_SIZE 10 void draw_arrow(int x, int y); int main(void) { /* request autodetection */ int gdri

C语言函数大全(k开头)

函数名: kbhit 功能: 检查当前按下的键 用法: int kbhit(void); 程序例: #include int main(void) { cprintf("Press any key to continue:"); while (!kbhit()) /* do nothing */ ; cprintf("\r\nA key was pressed...\r\n"); return 0; } 函数名: keep 功能: 退出并继续驻留 用法: void

C语言函数大全(l开头)

函数名: labs 用法: long labs(long n); 程序例: #include #include int main(void) { long result; long x = -12345678L; result= labs(x); printf("number: %ld abs value: %ld\n", x, result); return 0; } 函数名: ldexp 功能: 计算value*2的幂 用法: double ldexp(double value,