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air max wright &quot

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  函数名: sound

  功 能: 以指定频率打开PC扬声器

  用 法: void sound(unsigned frequency);

  程序例:

  /* Emits a 7-Hz tone for 10 seconds.

  Your PC may not be able to emit a 7-Hz tone. */

  #include <dos.h>

  int main(void)

  {

  sound(7);

  delay(10000);

  nosound();

  return 0;

  }

  函数名: spawnl

  功 能: 创建并运行子程序

  用 法: int spawnl(int mode, char *pathname, char *arg0,

  arg1, ... argn, NULL);

  程序例:

  #include <process.h>

  #include <stdio.h>

  #include <conio.h>

  int main(void)

  {

  int result;

  clrscr();

  result = spawnl(P_WAIT, "tcc.exe", NULL);

  if (result == -1)

  {

  perror("Error from spawnl");

  exit(1);

  }

  return 0;

  }

  函数名: spawnle

  功 能: 创建并运行子程序

  用 法: int spawnle(int mode, char *pathname, char *arg0,

  arg1,..., argn, NULL);

  程序例:

  /* spawnle() example */

  #include <process.h>

  #include <stdio.h>

  #include <conio.h>

  int main(void)

  {

  int result;

  clrscr();

  result = spawnle(P_WAIT, "tcc.exe", NULL, NULL);

  if (result == -1)

  {

  perror("Error from spawnle");

  exit(1);

  }

  return 0;

  }

  函数名: sprintf

  功 能: 送格式化输出到字符串中

  用 法: int sprintf(char *string, char *farmat [,argument,...]);

  程序例:

  #include <stdio.h>

  #include <math.h>

  int main(void)

  {

  char buffer[80];

  sprintf(buffer, "An approximation of Pi is %f/n", M_PI);

  puts(buffer);

  return 0;

  }

  函数名: sqrt

  功 能: 计算平方根

  用 法: double sqrt(double x);

  程序例:

  #include <math.h>

  #include <stdio.h>

  int main(void)

  {

  double x = 4.0, result;

  result = sqrt(x);

  printf("The square root of %lf is %lf/n",air max wright, x, result);

  return 0;

  }

  函数名: srand

  功 能: 初始化随机数发生器

  用 法: void srand(unsigned seed);

  程序例:

  #include <stdlib.h>

  #include <stdio.h>

  #include <time.h>

  int main(void)

  {

  int i;

  time_t t;

  srand((unsigned) time(&t));

  printf("Ten random numbers from 0 to 99/n/n");

  for(i=0; i<10; i++)

  printf("%d/n", rand() % 100);

  return 0;

  }

  函数名: sscanf

  用 法: int sscanf(char *string, char *format[,argument,...]);

  程序例:

  #include <stdio.h>

  #include <conio.h>

  int main(void)

  {

  char label[20];

  char name[20];

  int entries = 0;

  int loop, age;

  double salary;

  struct Entry_struct

  {

  char name[20];

  int age;

  float salary;

  } entry[20];

  /* Input a label as a string of characters restricting to 20 characters */

  printf("/n/nPlease enter a label for the chart: ");

  scanf("%20s", label);

  fflush(stdin); /* flush the input stream in case of bad input */

  /* Input number of entries as an integer */

  printf("How many entries will there be? (less than 20) ");

  scanf("%d", &entries);

  fflush(stdin); /* flush the input stream in case of bad input */

  /* input a name restricting input to only letters upper or lower case */

  for (loop=0;loop<entries;++loop)

  {

  printf("Entry %d/n",gucci bootsies, loop);

  printf(" Name : ");

  scanf("%[A-Za-z]", entry[loop].name);

  fflush(stdin); /* flush the input stream in case of bad input */

  /* input an age as an integer */

  printf(" Age : ");

  scanf("%d", &entry[loop].age);

  fflush(stdin); /* flush the input stream in case of bad input */

  /* input a salary as a float */

  printf(" Salary : ");

  scanf("%f", &entry[loop].salary);

  fflush(stdin); /* flush the input stream in case of bad input */

  }

  /* Input a name, age and salary as a string, integer, and double */

  printf("/nPlease enter your name, age and salary/n");

  scanf("%20s %d %lf", name, &age, &salary);

  /* Print out the data that was input */

  printf("/n/nTable %s/n",label);

  printf("Compiled by %s age %d $%15.2lf/n", name, age, salary);

  for (loop=0;loop<entries;++loop)

  printf("%4d | %-20s | %5d | %15.2lf/n",

  loop + 1,

  entry[loop].name,

  entry[loop].age,

  entry[loop].salary);

  return 0;

  }

  函数名: stat

  功 能: 读取打开文件信息

  用 法: int stat(char *pathname, struct stat *buff);

  程序例:

  #include <sys/stat.h>

  #include <stdio.h>

  #include <time.h>

  #define FILENAME "TEST.$$$"

  int main(void)

  {

  struct stat statbuf;

  FILE *stream;

  /* open a file for update */

  if ((stream = fopen(FILENAME, "w+")) == NULL)

  {

  fprintf(stderr, "Cannot open output file./n");

  return(1);

  }

  /* get information about the file */

  stat(FILENAME, &statbuf);

  fclose(stream);

  /* display the information returned */

  if (statbuf.st_mode & S_IFCHR)

  printf("Handle refers to a device./n");

  if (statbuf.st_mode & S_IFREG)

  printf("Handle refers to an ordinary file./n");

  if (statbuf.st_mode & S_IREAD)

  printf("User has read permission on file./n");

  if (statbuf.st_mode & S_IWRITE)

  printf("User has write permission on file./n");

  printf("Drive letter of file: %c/n", 'A'+statbuf.st_dev);

  printf("Size of file in bytes: %ld/n", statbuf.st_size);

  printf("Time file last opened: %s/n", ctime(&statbuf.st_ctime));

  return 0;

  }

  函数名: _status87

  功 能: 取浮点状态

  用 法: unsigned int _status87(void);

  程序例:

  #include <stdio.h>

  #include <float.h>

  int main(void)

  {

  float x;

  double y = 1.5e-100;

  printf("Status 87 before error: %x/n", _status87());

  x = y; /* <-- force an error to occur */

  y = x;

  printf("Status 87 after error : %x/n", _status87());

  return 0;

  }

  函数名: stime

  功 能: 设置时间

  用 法: int stime(long *tp);

  程序例:

  #include <stdio.h>

  #include <time.h>

  #include <dos.h>

  int main(void)

  {

  time_t t;

  struct tm *area;

  t = time(NULL);

  area = localtime(&t);

  printf("Number o
ce10
f seconds since 1/1/1970 is: %ld/n", t);

  printf("Local time is: %s", asctime(area));

  t++;

  area = localtime(&t);

  printf("Add a second: %s", asctime(area));

  t += 60;

  area = localtime(&t);

  printf("Add a minute: %s", asctime(area));

  t += 3600;

  area = localtime(&t);

  printf("Add an hour: %s", asctime(area));

  t += 86400L;

  area = localtime(&t);

  printf("Add a day: %s", asctime(area));

  t += 2592000L;

  area = localtime(&t);

  printf("Add a month: %s", asctime(area));

  t += 31536000L;

  area = localtime(&t);

  printf("Add a year: %s", asctime(area));

  return 0;

  }

  函数名: stpcpy

  功 能: 拷贝一个字符串到另一个

  用 法: char *stpcpy(char *destin, char *source);

  程序例:

  #include <stdio.h>

  #include <string.h>

  int main(void)

  {

  char string[10];

  char *str1 = "abcdefghi";

  stpcpy(string, str1);

  printf("%s/n", string);

  return 0;

  }

  函数名: strcat

  功 能: 字符串拼接函数

  用 法: char *strcat(char *destin, char *source);

  程序例:

  #include <string.h>

  #include <stdio.h>

  int main(void)

  {

  char destination[25];

  char *blank = " ", *c = "C++", *Borland = "Borland";

  strcpy(destination, Borland);

  strcat(destination, blank);

  strcat(destination, c);

  printf("%s/n", destination);

  return 0;

  }

  函数名: strchr

  功 能: 在一个串中查找给定字符的第一个匹配之处/

  用 法: char *strchr(char *str, char c);

  程序例:

  #include <string.h>

  #include <stdio.h>

  int main(void)

  {

  char string[15];

  char *ptr, c = 'r';

  strcpy(string, "This is a string");

  ptr = strchr(string, c);

  if (ptr)

  printf("The character %c is at position: %d/n", c, ptr-string);

  else

  printf("The character was not found/n");

  return 0;

  }

  函数名: strcmp

  功 能: 串比较

  用 法: int strcmp(char *str1, char *str2);

  程序例:

  #include <string.h>

  #include <stdio.h>

  int main(void)

  {

  char *buf1 = "aaa", *buf2 = "bbb", *buf3 = "ccc";

  int ptr;

  ptr = strcmp(buf2,nike basketball sneakers, buf1);

  if (ptr > 0)

  printf("buffer 2 is greater than buffer 1/n");

  else

  printf("buffer 2 is less than buffer 1/n");

  ptr = strcmp(buf2, buf3);

  if (ptr > 0)

  printf("buffer 2 is greater than buffer 3/n");

  else

  printf("buffer 2 is less than buffer 3/n");

  return 0;

  }

  函数名: strncmpi

  功 能: 将一个串中的一部分与另一个串比较, 不管大小写

  用 法: int strncmpi(char *str1, char *str2, unsigned maxlen);

  程序例:

  #include <string.h>

  #include <stdio.h>

  int main(void)

  {

  char *buf1 = "BBB", *buf2 = "bbb";

  int ptr;

  ptr = strcmpi(buf2, buf1);

  if (ptr > 0)

  printf("buffer 2 is greater than buffer 1/n");

  if (ptr < 0)

  printf("buffer 2 is less than buffer 1/n");

  if (ptr == 0)

  printf("buffer 2 equals buffer 1/n");

  return 0;

  }

  函数名: strcpy

  功 能: 串拷贝

  用 法: char *strcpy(char *str1, char *str2);

  程序例:

  #include <stdio.h>

  #include <string.h>

  int main(void)

  {

  char string[10];

  char *str1 = "abcdefghi";

  strcpy(string, str1);

  printf("%s/n", string);

  return 0;

  }

  函数名: strcspn

  功 能: 在串中查找第一个给定字符集内容的段

  用 法: int strcspn(char *str1, char *str2);

  程序例:

  #include <stdio.h>

  #include <string.h>

  #include <alloc.h>

  int main(void)

  {

  char *string1 = "1234567890";

  char *string2 = "747DC8";

  int length;

  length = strcspn(string1, string2);

  printf("Character where strings intersect is at position %d/n", length);

  return 0;

  }

  函数名: strdup

  功 能: 将串拷贝到新建的位置处

  用 法: char *strdup(char *str);

  程序例:

  #include <stdio.h>

  #include <string.h>

  #include <alloc.h>

  int main(void)

  {

  char *dup_str, *string = "abcde";

  dup_str = strdup(string);

  printf("%s/n", dup_str);

  free(dup_str);

  return 0;

  }

  函数名: stricmp

  功 能: 以大小写不敏感方式比较两个串

  用 法: int stricmp(char *str1, char *str2);

  程序例:

  #include <string.h>

  #include <stdio.h>

  int main(void)

  {

  char *buf1 = "BBB", *buf2 = "bbb";

  int ptr;

  ptr = stricmp(buf2, buf1);

  if (ptr > 0)

  printf("buffer 2 is greater than buffer 1/n");

  if (ptr < 0)

  printf("buffer 2 is less than buffer 1/n");

  if (ptr == 0)

  printf("buffer 2 equals buffer 1/n");

  return 0;

  }

  函数名: strerror

  功 能: 返回指向错误信息字符串的指针

  用 法: char *strerror(int errnum);

  程序例:

  #include <stdio.h>

  #include <errno.h>

  int main(void)

  {

  char *buffer;

  buffer = strerror(errno);

  printf("Error: %s/n", buffer);

  return 0;

  }

  函数名: strcmpi

  功 能: 将一个串与另一个比较, 不管大小写

  用 法: int strcmpi(char *str1, char *str2);

  程序例:

  #include <string.h>

  #include <stdio.h>

  int main(void)

  {

  char *buf1 = "BBB",Gucci Kids Shoes, *buf2 = "bbb";

  int ptr;

  ptr = strcmpi(buf2, buf1);

  if (ptr > 0)

  printf("buffer 2 is greater than buffer 1/n");

  if (ptr < 0)

  printf("buffer 2 is less than buffer 1/n");

  if (ptr == 0)

  printf("buffer 2 equals buffer 1/n");

  return 0;

  }

  函数名: strncmp

  功 能: 串比较

  用 法: int strncmp(char *str1, char *str2, int maxlen);

  程序例:

  #include <string.h>

  #include <stdio.h>

  int main(void)

  {

  char *buf1 = "aaabbb", *buf2 = "bbbccc", *buf3 = "ccc";

  int ptr;

  ptr = strncmp(buf2,buf1,3);

  if (ptr > 0)

  printf("buffer 2 is greater than buffer 1/n");

  else

  printf("buffer 2 is less than buffer 1/n");

  ptr = strncmp(buf2,buf3,3);

  if (ptr > 0)

  printf("buffer 2 is greater than buffer 3/n");

  else

  printf("buffer 2 is less than buffer 3/n");

  return(0);

  }

  函数名: strncmpi

  功 能: 把串中的一部分与另一串中的一部分比较, 不管大小写

  用 法: int strncmpi(char *str1, char *str2);

  程序例:

  #include <string.h>

  #include <stdio.h>

  int main(void)

  {

  char *buf1 = "BBBccc", *buf2 = "bbbccc";

  int ptr;

  ptr = strncmpi(buf2,buf1,3);

  if (ptr > 0)

  printf("buffer 2 is greater than buffer 1/n");

  if (ptr < 0)

  printf("buffer 2 is less than buffer 1/n");

  if (ptr == 0)

  printf("buffer 2 equals buffer 1/n");

  return 0;

  }

  函数名: strncpy

  功 能: 串拷贝

  用 法: char *strncpy(char *destin, char *source, int maxlen);

  程序例:

  #include <stdio.h>

  #include <string.h>

  int main(void)

  {

  char string[10];

  char *str1 = "abcdefghi";

  strncpy(string, str1, 3);

  string[3] = '/0';

  printf("%s/n", string);

  return 0;

  }

  函数名: strnicmp

  功 能: 不注重大小写地比较两个串

  用 法: int strnicmp(char *str1, char *str2, unsigned maxlen);

  程序例:

  #include <string.h>

  #include <stdio.h>

  int main(void)

  {

  char *buf1 = "BBBccc", *buf2 = "bbbccc";

  int ptr;

  ptr = strnicmp(buf2, buf1, 3);

  if (ptr > 0)

  printf("buffer 2 is greater than buffer 1/n");

  if (ptr < 0)

  printf("buffer 2 is less than buffer 1/n");

  if (ptr == 0)

  printf("buffer 2 equals buffer 1/n");

  return 0;

  }

  函数名: strnset

  功 能: 将一个串中的所有字符都设为指定字符

  用 法: char *strnset(char *str, char ch, unsigned n);

  程序例:

  #include <stdio.h>

  #include <string.h>

  int main(void)

  {

  char *string = "abcdefghijklmnopqrstuvwxyz";

  char letter = 'x';

  printf("string before strnset: %s/n", string);

  strnset(string, letter, 13);

  printf("string after strnset: %s/n", string);

  return 0;

  }

  函数名: strpbrk

  功 能: 在串中查找给定字符集中的字符

  用 法: char *strpbrk(char *str1, char *str2);

  程序例:

  #include <stdio.h>

  #include <string.h>

  int main(void)

  {

  char *string1 = "abcdefghijklmnopqrstuvwxyz";

  char *string2 = "onm";

  char *ptr;

  ptr = strpbrk(string1, string2);

  if (ptr)

  printf("strpbrk found first character: %c/n", *ptr);

  else

  printf("strpbrk didn't find character in set/n");

  return 0;

  }

  函数名: strrchr

  功 能: 在串中查找指定字符的最后一个出现

  用 法: char *strrchr(char *str, char c);

  程序例:

  #include <string.h>

  #include <stdio.h>

  int main(void)

  {

  char string[15];

  char *ptr, c = 'r';

  strcpy(string, "This is a string");

  ptr = strrchr(string, c);

  if (ptr)

  printf("The character %c is at position: %d/n", c, ptr-string);

  else

  printf("The character was not found/n");

  return 0;

  }

  函数名: strrev

  功 能: 串倒转

  用 法: char *strrev(char *str);

  程序例:

  #include <string.h>

  #include <stdio.h>

  int main(void)

  {

  char *forward = "string";

  printf("Before strrev(): %s/n", forward);

  strrev(forward);

  printf("After strrev(): %s/n", forward);

  return 0;

  }

  函数名: strset

  功 能: 将一个串中的所有字符都设为指定字符

  用 法: char *strset(char *str, char c);

  程序例:

  #include <stdio.h>

  #include <string.h>

  int main(void)

  {

  char string[10] = "123456789";

  char symbol = 'c';

  printf("Before strset(): %s/n", string);

  strset(string, symbol);

  printf("After strset(): %s/n", string);

  return 0;

  }

  函数名: strspn

  功 能: 在串中查找指定字符集的子集的第一次出现

  用 法: int strspn(char *str1, char *str2);

  程序例:

  #include <stdio.h>

  #include <string.h>

  #include <alloc.h>

  int main(void)

  {

  char *string1 = "1234567890";

  char *string2 = "123DC8";

  int length;

  length = strspn(string1, string2);

  printf("Character where strings differ is at position %d/n", length);

  return 0;

  }

  函数名: strstr

  功 能: 在串中查找指定字符串的第一次出现

  用 法: char *strstr(char *str1, char *str2);

  程序例:

  #include <stdio.h>

  #include <string.h>

  int main(void)

  {

  char *str1 = "Borland International", *str2 = "nation", *ptr;

  ptr = strstr(str1, str2);

  printf("The substring is: %s/n", ptr);

  return 0;

  }

  函数名: strtod

  功 能: 将字符串转换为double型值

  用 法: double strtod(char *str, char **endptr);

  程序例:

  #include <stdio.h>

  #include <stdlib.h>

  int main(void)

  {

  char input[80], *endptr;

  double value;

  printf("Enter a floating point number:");

  gets(input);

  value = strtod(input, &endptr);

  printf("The string is %s the number is %lf/n", input, value);

  return 0;

  }

  函数名: strtok

  功 能: 查找由在第二个串中指定的分界符分隔开的单词

  用 法: char *strtok(char *str1, char *str2);

  程序例:

  #include <string.h>

  #include <stdio.h>

  int main(void)

  {

  char input[16] = "abc,d";

  char *p;

  /* strtok places a NULL terminator

  in front of the token, if found */

  p = strtok(input, ",");

  if (p) printf("%s/n", p);

  /* A second call to strtok using a NULL

  as the first parameter returns a pointer

  to the character following the token */

  p = strtok(NULL, ",");

  if (p) printf("%s/n", p);

  return 0;

  }

  函数名: strtol

  功 能: 将串转换为长整数

  用 法: long strtol(char *str, char **endptr, int base);

  程序例:

  #include <stdlib.h>

  #include <stdio.h>

  int main(void)

  {

  char *string = "87654321", *endptr;

  long lnumber;

  /* strtol converts string to long integer */

  lnumber = strtol(string, &endptr, 10);

  printf("string = %s long = %ld/n", string, lnumber);

  return 0;

  }

  函数名: strupr

  功 能: 将串中的小写字母转换为大写字母

  用 法: char *strupr(char *str);

  程序例:

  #include <stdio.h>

  #include <string.h>

  int main(void)

  {

  char *string = "abcdefghijklmnopqrstuvwxyz", *ptr;

  /* converts string to upper case characters */

  ptr = strupr(string);

  printf("%s/n", ptr);

  return 0;

  }

  函数名: swab

  功 能: 交换字节

  用 法: void swab (char *from,air jordan 1, char *to, int nbytes);

  程序例:

  #include <stdlib.h>

  #include <stdio.h>

  #include <string.h>

  char source[15] = "rFna koBlrna d";

  char target[15];

  int main(void)

  {

  swab(source, target, strlen(source));

  printf("This is target: %s/n", target);

  return 0;

  }

  函数名: system

  功 能: 发出一个DOS命令

  用 法: int system(char *command);

  程序例:

  #include <stdlib.h>

  #include <stdio.h>

  int main(void)

  {

  system("dir");

  return 0;

  }
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