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c语言的用法总结

时间: 长思709 分享
  随着经济的迅速发展以及科学技术水平的不断提高,计算机技术发展迅速,成为21世纪的热门技术,在很大程度上促进生产力水平的提高以及经济的发展。C语言的发展还在进行着,并且不断趋于完善,它具有较多的优点。下面小编就为大家分享下c语言的用法总结。
  c语言的用法总结1
  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;
  }
  c语言的用法总结2
  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;
  }
  c语言的用法总结3
  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;
  }
  c语言的用法总结4
  函数名: strcmp
  功  能: 串比较
  用  法: int strcmp(char *str1, char *str2);
  看Asic码,str1>str2,返回值 > 0;两串相等,返回0
  程序例:
  #include <string.h>
  #include <stdio.h>
  int main(void)
  {
  char *buf1 = "aaa", *buf2 = "bbb", *buf3 = "ccc";
  int ptr;
  ptr = strcmp(buf2, 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;
  }
  c语言的用法总结5
  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;
  }
  c语言的用法总结6
  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;
  }
  c语言的用法总结7
  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;
  }
  c语言的用法总结8
  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;
  }
  c语言的用法总结9
  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;
  }
  c语言的用法总结10
  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;
  }
  c语言的用法总结11
  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", *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;
  }
  c语言的用法总结12
  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);
  }
  c语言的用法总结13
  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;
  }
  c语言的用法总结14
  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;
  }
  c语言的用法总结15
  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;
  }
  c语言的用法总结16
  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;
  }
  c语言的用法总结17
  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;
  }
  c语言的用法总结18
  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;
  }
  c语言的用法总结19
  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;
  }
  c语言的用法总结20
  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;
  }
  c语言的用法总结21
  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;
  }
  c语言的用法总结22
  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;
  }
  c语言的用法总结23
  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;
  }
  c语言的用法总结24
  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;
  }
  c语言的用法总结25
  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;
  }
  c语言的用法总结26
  函数名: swab
  功  能: 交换字节
  用  法: void swab (char *from, 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;
  }
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