C语言中的sscanf()函数使用详解

　　Int sscanf( string str, string fmt, mixed var1, mixed var2 ... );
　　int scanf( const char *format [,argument]... );

 {%[*] [width][{h | l | l64 | L}]type | ' ' | t' | '\n' | 非%符号} 

 #include <stdio.h> 
 #include <stdlib.h> 
 #include <string.h> 
  
  
 int main() 
 { 
  int result; 
  char str[100]; 
  char buf1[255], buf2[255], buf3[255], buf4[255]; 
   
  //基本用法 
  memset(str, 0, sizeof(str)); 
  strcpy(str, "i love china!"); 
  result = sscanf(str, "%s %s %s", buf1, buf2, buf3); 
  printf("%d\n%s\n%s\n%s\n", result, buf1, buf2, buf3); 
  /** 
   * 执行结果： 
   * 3 
   * i 
   * love 
   * china! 
   * 可以看出，sscanf的返回值为读取的参数个数 
   */ 
  
  //读取指定长度的字符串 
  memset(str, 0, sizeof(str)); 
  strcpy(str, "abcdefghijklmnopq"); 
  sscanf(str, "%5s", buf4); 
  printf("%s\n", buf4); 
  /** 
   * 执行结果： 
   * abcde 
   */ 
  
  //正则匹配字符串 
  memset(str, 0, sizeof(str)); 
  memset(buf1, 0, sizeof(buf1)); 
  memset(buf2, 0, sizeof(buf2)); 
  memset(buf3, 0, sizeof(buf3)); 
  strcpy(str, "123456abcdedfANDFS"); 
  sscanf(str, "%[0-9]%[a-z]%[A-Z]", buf1, buf2, buf3); 
  printf("%s\n%s\n%s\n", buf1, buf2, buf3); 
  /** 
   * 执行结果： 
   * 123456 
   * abcdedf 
   * ANDFS 
   * 很难相信c语言竟然支持正则，不过c支持的正则挺弱的 
   */ 
  return 0; 
 } 

 #include <stdio.h> 
 #include <stdlib.h> 
 #include <string.h> 
  
 struct mission 
 { 
  char str[200]; 
  char name[20]; 
  int year, month, day, hour, minute, second, micro; 
  double runtime; 
 }; 
  
 int compare(const void *p, const void *q); 
  
 int main() 
 { 
  struct mission mis[10001]; 
  int i, n = 0; 
  memset(mis, 0, sizeof(mis)); 
  while(gets(mis[n].str)) 
  { 
   if(strcmp(mis[n].str, "") == 0) 
   { 
    break; 
   } 
   sscanf(mis[n].str, "%s%d-%d-%d %d:%d:%d,%d %lf", mis[n].name, &mis[n].year, &mis[n].month, &mis[n].day, &mis[n].hour, &mis[n].minute, &mis[n].second, &mis[n].micro, &mis[n].runtime); 
   n ++; 
  } 
  
  qsort(mis, n, sizeof(mis[0]), compare); 
  
  
  for(i = 0; i < n; i ++) 
  { 
   printf("%s\n", mis[i].str); 
  } 
  
  return 0; 
 } 
  
 int compare(const void *p, const void *q) 
 { 
  const struct mission *a = p; 
  const struct mission *b = q; 
  
  if(a->runtime > b->runtime) 
  { 
   return 1; 
  }else if(a->runtime == b->runtime && a->year > b->year) 
  { 
   return 1; 
  }else if(a->runtime == b->runtime && a->year == b->year && a->month > b->month) 
  { 
   return 1; 
  }else if(a->runtime == b->runtime && a->year == b->year && a->month == b->month && a->day > b->day) 
  { 
   return 1; 
  }else if(a->runtime == b->runtime && a->year == b->year && a->month == b->month && a->day == b->day && a->hour > b->hour) 
  { 
   return 1; 
  }else if(a->runtime == b->runtime && a->year == b->year && a->month == b->month && a->day == b->day && a->hour == b->hour && a->minute > b->minute) 
  { 
   return 1; 
  }else if(a->runtime == b->runtime && a->year == b->year && a->month == b->month && a->day == b->day && a->hour == b->hour && a->minute == b->minute && a->second > b->second) 
  { 
   return 1; 
  }else if(a->runtime == b->runtime && a->year == b->year && a->month == b->month && a->day == b->day && a->hour == b->hour && a->minute == b->minute && a->second == b->second && a->micro > b->micro) 
  { 
   return 1; 
  }else if(a->runtime == b->runtime && a->year == b->year && a->month == b->month && a->day == b->day && a->hour == b->hour && a->minute == b->minute && a->second > b->second && a->micro == b->micro) 
  { 
   return 0; 
  } 
  else 
  { 
   return -1; 
  } 
 }