求C语言函数大全

函数名: abort

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功 能: 异常终止一个进程

用 法: void abort(void);

程序例:

#include stdio.h

#include stdlib.h

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 stdio.h

#include math.h

int main(void)

{

int number = -1234;

printf("number: %d absolute value: %d\n", number, abs(number));

return 0;

}

函数名: absread, abswirte

功 能: 绝对磁盘扇区读、写数据

用 法: int absread(int drive, int nsects, int sectno, void *buffer);

int abswrite(int drive, int nsects, in tsectno, void *buffer);

程序例:

/* absread example */

#include stdio.h

#include conio.h

#include process.h

#include dos.h

int main(void)

{

int i, strt, ch_out, sector;

char buf[512];

printf("Insert a diskette into drive A and press any key\n");

getch();

sector = 0;

if (absread(0, 1, sector, buf) != 0)

{

perror("Disk problem");

exit(1);

}

printf("Read OK\n");

strt = 3;

for (i=0; i80; i++)

{

ch_out = buf[strt+i];

putchar(ch_out);

}

printf("\n");

return(0);

}

函数名: access

功 能: 确定文件的访问权限

用 法: int access(const char *filename, int amode);

程序例:

#include stdio.h

#include io.h

int file_exists(char *filename);

int main(void)

{

printf("Does NOTEXIST.FIL exist: %s\n",

file_exists("NOTEXISTS.FIL") ? "YES" : "NO");

return 0;

}

int file_exists(char *filename)

{

return (access(filename, 0) == 0);

}

函数名: acos

功 能: 反余弦函数

用 法: double acos(double x);

程序例:

#include stdio.h

#include math.h

int main(void)

{

double result;

double x = 0.5;

result = acos(x);

printf("The arc cosine of %lf is %lf\n", x, result);

return 0;

}

函数名: allocmem

功 能: 分配DOS存储段

用 法: int allocmem(unsigned size, unsigned *seg);

程序例:

#include dos.h

#include alloc.h

#include stdio.h

int main(void)

{

unsigned int size, segp;

int stat;

size = 64; /* (64 x 16) = 1024 bytes */

stat = allocmem(size, segp);

if (stat == -1)

printf("Allocated memory at segment: %x\n", segp);

else

printf("Failed: maximum number of paragraphs available is %u\n",

stat);

return 0;

}

函数名: arc

功 能: 画一弧线

用 法: void far arc(int x, int y, int stangle, int endangle, int radius);

程序例:

#include graphics.h

#include stdlib.h

#include stdio.h

#include conio.h

int main(void)

{

/* request auto detection */

int gdriver = DETECT, gmode, errorcode;

int midx, midy;

int stangle = 45, endangle = 135;

int radius = 100;

/* 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();

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

}

midx = getmaxx() / 2;

midy = getmaxy() / 2;

setcolor(getmaxcolor());

/* draw arc */

arc(midx, midy, stangle, endangle, radius);

/* clean up */

getch();

closegraph();

return 0;

}

函数名: asctime

功 能: 转换日期和时间为ASCII码

用 法: char *asctime(const struct tm *tblock);

程序例:

#include stdio.h

#include string.h

#include time.h

int main(void)

{

struct tm t;

char str[80];

/* sample loading of tm structure */

t.tm_sec = 1; /* Seconds */

t.tm_min = 30; /* Minutes */

t.tm_hour = 9; /* Hour */

t.tm_mday = 22; /* Day of the Month */

t.tm_mon = 11; /* Month */

t.tm_year = 56; /* Year - does not include century */

t.tm_wday = 4; /* Day of the week */

t.tm_yday = 0; /* Does not show in asctime */

t.tm_isdst = 0; /* Is Daylight SavTime; does not show in asctime */

/* converts structure to null terminated

string */

strcpy(str, asctime(t));

printf("%s\n", str);

return 0;

}

函数名: asin

功 能: 反正弦函数

用 法: double asin(double x);

程序例:

#include stdio.h

#include math.h

int main(void)

{

double result;

double x = 0.5;

result = asin(x);

printf("The arc sin of %lf is %lf\n", x, result);

return(0);

}

函数名: assert

功 能: 测试一个条件并可能使程序终止

用 法: void assert(int test);

程序例:

#include assert.h

#include stdio.h

#include stdlib.h

struct ITEM {

int key;

int value;

};

/* add item to list, make sure list is not null */

void additem(struct ITEM *itemptr) {

assert(itemptr != NULL);

/* add item to list */

}

int main(void)

{

additem(NULL);

return 0;

}

函数名: atan

功 能: 反正切函数

用 法: double atan(double x);

程序例:

#include stdio.h

#include math.h

int main(void)

{

double result;

double x = 0.5;

result = atan(x);

printf("The arc tangent of %lf is %lf\n", x, result);

return(0);

}

函数名: atan2

功 能: 计算Y/X的反正切值

用 法: double atan2(double y, double x);

程序例:

#include stdio.h

#include math.h

int main(void)

{

double result;

double x = 90.0, y = 45.0;

result = atan2(y, x);

printf("The arc tangent ratio of %lf is %lf\n", (y / x), result);

return 0;

}

函数名: atexit

功 能: 注册终止函数

用 法: int atexit(atexit_t func);

程序例:

#include stdio.h

#include stdlib.h

void exit_fn1(void)

{

printf("Exit function #1 called\n");

}

void exit_fn2(void)

{

printf("Exit function #2 called\n");

}

int main(void)

{

/* post exit function #1 */

atexit(exit_fn1);

/* post exit function #2 */

atexit(exit_fn2);

return 0;

}

函数名: atof

功 能: 把字符串转换成浮点数

用 法: double atof(const char *nptr);

程序例:

#include stdlib.h

#include stdio.h

int main(void)

{

float f;

char *str = "12345.67";

f = atof(str);

printf("string = %s float = %f\n", str, f);

return 0;

}

函数名: atoi

功 能: 把字符串转换成长整型数

用 法: int atoi(const char *nptr);

程序例:

#include stdlib.h

#include stdio.h

int main(void)

{

int n;

char *str = "12345.67";

n = atoi(str);

printf("string = %s integer = %d\n", str, n);

return 0;

}

函数名: atol

功 能: 把字符串转换成长整型数

用 法: long atol(const char *nptr);

程序例:

#include stdlib.h

#include stdio.h

int main(void)

{

long l;

char *str = "98765432";

l = atol(lstr);

printf("string = %s integer = %ld\n", str, l);

return(0);

}

c语言如何用函数指针利用循环结构遍历多个函数

#include stdio.h

#define TYPE int

// 下面是加减乘除 4 个函数

TYPE add(TYPE a, TYPE b){return a+b;}

TYPE sub(TYPE a, TYPE b){return a-b;}

TYPE muti(TYPE a, TYPE b){return a*b;}

TYPE div(TYPE a, TYPE b){return a/b;}

int main(int argc, char *argv[])

{

// 函数指针数组，一共有 4 四个元素，分别是：

// 加减乘除 4 个函数的函数指针

// 你可以自己再添加其他函数，而不用修改代码。

TYPE (*functions[])(TYPE, TYPE) = {add,sub,muti,div};

// 函数指针数组中的元素个数，这里是 4 个。

unsigned int n = sizeof(functions)/sizeof(functions[0]);

// 要进行运算的数字

TYPE a = 10, b = 5 , result;

int i=0;

for(i=0; in; i++)

{// 调用函数指针数组里面的所有函数。

result = functions[i](a,b);

printf("%d\n", result);

}

return 0;

}

C语言遍历所有文件的函数!

#include stdio.h

#include dos.h

#include errno.h

#include io.h

#include dirent.h

#include dir.h

#include string.h

#include sys\stat.h

#include "pm03a.h"

void main(int argc,char* argv[])

{

//printf("Number %d\n",ConfirmFileAttrib(argv[1]));

GetDirectory(argv[1]);

printf("\nSearch Over.\n");

}

//------------------------------------------------------------------

//pm03a.h

//------------------------------------------------------------------

void GetDirectory(char *DirectoryName);

int ConfirmFileAttrib(char* filename);

char *GetCurrentPath();

char* GetFullFileName(char *filename);

char *WillDeleteFile(char *FileName);

//--------------------------------------------------------

//--------------- 获得文件属性 ---------------------------

//--------------------------------------------------------

int ConfirmFileAttrib(char* filename)

{

int temp=0;

int attrib=(_rtl_chmod(filename,0));

if(attrib==-1)

{

switch(errno)

{

case ENOENT:

//printf("%s Path or file not found.\n",filename);

temp=0;

break;

case EACCES:

//printf("Permission denied.\n");

temp=-1;

break;

default:

//printf("Error number: %d", errno);

temp=-2;

break;

}

}

else

{

if(attrib FA_RDONLY)

{

temp=1;

//printf("%s is read-only.\n", filename);

}

if(attrib FA_HIDDEN)

{

temp=2;

//printf("%s is hidden.\n", filename);

}

if(attrib FA_SYSTEM)

{

temp=3;

//printf("%s is a system file.\n", filename);

}

if(attrib FA_DIREC)

{

temp=4;

//printf("%s is a directory.\n", filename);

}

if (attrib FA_ARCH)

{

temp=5;

//printf("%s is an archive file.\n", filename);

}

}

return temp;

}

//--------------------------------------------------------

//--------------------------------------------------------

//--------------- 获取目录流 -----------------------------

//--------------------------------------------------------

void GetDirectory(char *DirectoryName)

{

DIR* Directory_Point;

struct dirent *entry;

bool DirControl;

if((Directory_Point=opendir(DirectoryName))==NULL)

{

printf("Error opening directory!\n");

return;

}

else

{

if(strcmp(DirectoryName,"..")==0)

{

return;

}

if(strcmp(DirectoryName,".")==0)

DirControl=true;

else

DirControl=false;

chdir(DirectoryName);

//char *filename=DirectoryName;

//int k=creat(strcat(filename,".txt"),S_IWRITE);

while(bool(entry=readdir(Directory_Point)))

{

if(ConfirmFileAttrib(entry-d_name)==5) // 确定为文件属性

{

// 文件过滤

WillDeleteFile(entry-d_name);

}

if(ConfirmFileAttrib(entry-d_name)==4) // 确定为目录属性

{

if(strcmpi(entry-d_name,"..")==0||strcmpi(entry-d_name,".")==0)

{

continue;

}

else

{

//printf("\n%s is direct\n\n",entry-d_name);

GetDirectory(entry-d_name);

}

}

}

if(!DirControl==true)

chdir("..");

closedir(Directory_Point);

}

}

//--------------------------------------------------------

//--------------------------------------------------------

//---------- 判断文件类型以备过滤 ------------------------

//--------------------------------------------------------

char* GetFullFileName(char *filename)

{

char *FullFilename=GetCurrentPath();

if(strlen(FullFilename)=3)

{

strcat(FullFilename,filename);

}

else

{

strcat(FullFilename,"\\");

strcat(FullFilename,filename);

}

return FullFilename;

}

char *GetCurrentPath()

{

char path[1024]="";

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;

}

char *WillDeleteFile(char *FileName)

{

int len;

for(len=strlen(FileName);len=0;len--)

{

if(FileName[len]=='.')

break;

}

char* Retname;

int s=-1;

for(int i=len;i=strlen(FileName);i++)

{

Retname[s+=1]=FileName[i];

}

int i=-1;

if(Retname[1]=='~')i=0;

if(strcmpi(Retname,".bak")==0)i=0;

if(strcmpi(Retname,".obj")==0)i=0;

if(strcmpi(Retname,".tds")==0)i=0;

if(strcmpi(Retname,".dcu")==0)i=0;

if(strcmpi(Retname,".tmp")==0)i=0;

if(strcmpi(Retname,".ilk")==0)i=0;

if(strcmpi(Retname,".pch")==0)i=0;

if(strcmpi(Retname,".pdb")==0)i=0;

if(strcmpi(Retname,".tlb")==0)i=0;

if(strcmpi(Retname,".idb")==0)i=0;

if(strcmpi(Retname,".pdb")==0)i=0;

if(strcmpi(Retname,".r$p")==0)i=0;

if(strcmpi(Retname,".OBR")==0)i=0;

if(strcmpi(Retname,".mbt")==0)i=0;

if(strcmpi(Retname,".mrt")==0)i=0;

if(strcmpi(Retname,".csm")==0)i=0;

if(i==0)

{

remove(GetFullFileName(FileName));

printf("%s delete\n",GetFullFileName(FileName));

}

return Retname;

}

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