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荣耀QCE序设计之四书五l?
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http://www.vckbase.com/document/viewdoc/?id=957
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{
(tng) (tng) (tng) (tng) (tng) (tng)int a,b;
(tng) (tng) (tng) (tng) (tng) (tng)int i;
(tng) (tng) (tng) (tng) (tng) (tng)a=b=1;
(tng) (tng) (tng) (tng) (tng) (tng)for(i=1;i<100;i++)
(tng) (tng) (tng) (tng) (tng) (tng){
(tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) printf("%4d%4d",a,b);
(tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) a+=b;
(tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) b+=a;
(tng) (tng) (tng) (tng) (tng) (tng)}
(tng) (tng) (tng) (tng) (tng) (tng)printf("\n");
}
]]>
(tng) #include (tng) <conio.h> (tng)
(tng) #include (tng) <stdarg.h> (tng)
(tng) #include (tng) <stdio.h> (tng)
(tng) #include (tng) <stdlib.h> (tng)
(tng) #include (tng) "winsock.h" (tng)
(tng) #include (tng) "mysql.h" (tng)
(tng) (tng)
(tng) MYSQL (tng) (tng) (tng) (tng) (tng) *mysql (tng) = (tng) NULL; (tng)
(tng) (tng)
(tng) void (tng) MySQLError(void) (tng)
(tng) { (tng)
(tng) fprintf(stderr, (tng) "%s\n", (tng) mysql_error(mysql)); (tng)
(tng) exit(1); (tng)
(tng) } (tng)
(tng) (tng)
(tng) void (tng) ExecuteSQL(char (tng) *fmt, (tng) ...) (tng)
(tng) { (tng)
(tng) char (tng) SQL[1000] (tng) = (tng) {0}; (tng)
(tng) int (tng) (tng) retval; (tng)
(tng) va_list (tng) args; (tng)
(tng) va_start(args, (tng) fmt); (tng)
(tng) if (tng) (_vsnprintf(SQL, (tng) sizeof(SQL)-1, (tng) fmt, (tng) args) (tng) < (tng) 0) (tng)
(tng) { (tng)
(tng) fprintf(stderr, (tng) "SQL (tng) query (tng) truncated! (tng) Increase (tng) SQL (tng) buffer (tng) size (tng) in (tng) ExecuteSQL\n"); (tng)
(tng) exit(1); (tng)
(tng) } (tng)
(tng) va_end(args); (tng)
(tng) retval (tng) = (tng) mysql_query(mysql, (tng) SQL); (tng)
(tng) if (tng) (retval) (tng)
(tng) { (tng)
(tng) fprintf(stderr, (tng) "Original (tng) SQL (tng) Statement: (tng) %s\n", (tng) SQL); (tng)
(tng) fprintf(stderr, (tng) "%s\n", (tng) mysql_error(mysql)); (tng)
(tng) exit(2); (tng)
(tng) } (tng)
(tng) } (tng)
(tng) (tng)
(tng) int (tng) main() (tng)
(tng) { (tng)
(tng) UINT (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) i; (tng)
(tng) UINT (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) FieldCount; (tng)
(tng) MYSQL_RES (tng) (tng) (tng) *res (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) = (tng) NULL; (tng)
(tng) MYSQL_ROW (tng) (tng) (tng) (tng) row (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) = (tng) NULL; (tng)
(tng) MYSQL_FIELD (tng) *field; (tng)
(tng) (tng)
(tng) char (tng) (tng) (tng) (tng) (tng) (tng) *DBName (tng) (tng) (tng) (tng) (tng) (tng) = (tng) "Test"; (tng)
(tng) char (tng) (tng) (tng) (tng) (tng) (tng) *TableName (tng) (tng) (tng) = (tng) "People"; (tng)
(tng) char (tng) (tng) (tng) (tng) (tng) (tng) *CreateDB (tng) (tng) (tng) (tng) = (tng) "CREATE (tng) DATABASE (tng) IF (tng) NOT (tng) EXISTS (tng) %s"; (tng)
(tng) char (tng) (tng) (tng) (tng) (tng) (tng) *DropTable (tng) (tng) (tng) = (tng) "DROP (tng) TABLE (tng) IF (tng) EXISTS (tng) %s"; (tng)
(tng) char (tng) (tng) (tng) (tng) (tng) (tng) *CreateTable (tng) = (tng) "CREATE (tng) TABLE (tng) IF (tng) NOT (tng) EXISTS (tng) %s (tng) (\n" (tng)
(tng) (tng) "ID (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) INT (tng) UNSIGNED (tng) AUTO_INCREMENT, (tng) \n" (tng)
(tng) (tng) "FirstName (tng) (tng) VARCHAR(32), (tng) \n" (tng)
(tng) (tng) "MiddleName (tng) VARCHAR(32), (tng) \n" (tng)
(tng) (tng) "LastName (tng) (tng) (tng) VARCHAR(32), (tng) \n" (tng)
(tng) (tng) "Address1 (tng) (tng) (tng) VARCHAR(50), (tng) \n" (tng)
(tng) (tng) "Address2 (tng) (tng) (tng) VARCHAR(50), (tng) \n" (tng)
(tng) (tng) "City (tng) (tng) (tng) (tng) (tng) (tng) (tng) VARCHAR(50), (tng) \n" (tng)
(tng) (tng) "State (tng) (tng) (tng) (tng) (tng) (tng) VARCHAR(2), (tng) \n" (tng)
(tng) (tng) "Zip (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) VARCHAR(5), (tng) \n" (tng)
(tng) (tng) "Email (tng) (tng) (tng) (tng) (tng) (tng) VARCHAR(50), (tng) \n" (tng)
(tng) (tng) "Gender (tng) (tng) (tng) (tng) (tng) VARCHAR(1), (tng) \n" (tng)
(tng) (tng) "WorkPhone (tng) (tng) VARCHAR(50), (tng) \n" (tng)
(tng) (tng) "HomePhone (tng) (tng) VARCHAR(50), (tng) \n" (tng)
(tng) (tng) "CellPhone (tng) (tng) VARCHAR(50), (tng) \n" (tng)
(tng) (tng) "BirthDate (tng) (tng) DATE (tng) NULL, (tng) \n" (tng)
(tng) (tng) "Primary (tng) Key (tng) (ID) (tng) \n" (tng)
(tng) (tng) ")\n"; (tng)
(tng) char (tng) (tng) (tng) (tng) (tng) (tng) *AddRecord (tng) (tng) (tng) = (tng) "INSERT (tng) INTO (tng) %s (tng) (FirstName, (tng) LastName) (tng) VALUES (tng) ('FirstName (tng) %03d', (tng) 'LastName (tng) %03d')"; (tng)
(tng) char (tng) (tng) (tng) (tng) (tng) (tng) *GetRecords (tng) (tng) = (tng) "SELECT (tng) ID, (tng) FirstName, (tng) LastName (tng) FROM (tng) %s"; (tng)
(tng) (tng)
(tng) (tng)
(tng) (tng)
(tng) // (tng) Initialize (tng) MySQL (tng)
(tng) mysql (tng) = (tng) mysql_init(NULL); (tng)
(tng) (tng)
(tng) // (tng) Connect (tng) to (tng) MySQL (tng)
(tng) if (tng) (!(mysql_real_connect(mysql, (tng) "localhost", (tng) "admin", (tng) "", (tng) NULL, (tng) mysql->port, (tng) 0, (tng) 0))) (tng) (tng)
(tng) MySQLError(); (tng)
(tng) (tng)
(tng) // (tng) Create (tng) database (tng)
(tng) ExecuteSQL(CreateDB, (tng) DBName); (tng)
(tng) (tng)
(tng) // (tng) Connect (tng) to (tng) temporary (tng) database (tng)
(tng) if (tng) (mysql_select_db(mysql, (tng) DBName)) (tng)
(tng) MySQLError(); (tng)
(tng) (tng)
(tng) // (tng) Delete (tng) table (tng) if (tng) it (tng) already (tng) exists. (tng)
(tng) ExecuteSQL(DropTable, (tng) TableName); (tng)
(tng) (tng)
(tng) // (tng) Create (tng) table (tng)
(tng) ExecuteSQL(CreateTable, (tng) TableName); (tng)
(tng) (tng)
(tng) // (tng) Insert (tng) some (tng) data (tng) into (tng) the (tng) table. (tng)
(tng) for (tng) (i (tng) = (tng) 0; (tng) i (tng) < (tng) 200; (tng) i++) (tng)
(tng) ExecuteSQL(AddRecord, (tng) TableName, (tng) i, (tng) i); (tng)
(tng) (tng)
(tng) // (tng) Execute (tng) query (tng)
(tng) ExecuteSQL(GetRecords, (tng) TableName); (tng)
(tng) (tng)
(tng) // (tng) Store (tng) the (tng) recordset (tng)
(tng) if (tng) ((res (tng) = (tng) mysql_store_result(mysql)) (tng) == (tng) NULL) (tng)
(tng) MySQLError(); (tng)
(tng) (tng)
(tng) // (tng) Print (tng) the (tng) recordset (tng)
(tng) printf("Table (tng) %s\n", (tng) TableName); (tng)
(tng) while((field (tng) = (tng) mysql_fetch_field(res)) (tng) != (tng) NULL) (tng)
(tng) printf("%s\t", (tng) field->name); (tng)
(tng) printf("\n"); (tng)
(tng) FieldCount (tng) = (tng) mysql_num_fields(res); (tng)
(tng) while((row (tng) = (tng) mysql_fetch_row(res)) (tng) != (tng) NULL) (tng) (tng)
(tng) { (tng)
(tng) for (tng) (i (tng) = (tng) 0; (tng) i (tng) < (tng) FieldCount; (tng) i++) (tng) (tng)
(tng) printf("%s\t", (tng) row[i]); (tng)
(tng) printf("\n"); (tng)
(tng) } (tng)
(tng) printf("\nTotal (tng) rows: (tng) %d\n", (tng) mysql_num_rows(res)); (tng)
(tng) (tng)
(tng) // (tng) Free (tng) the (tng) recordset (tng)
(tng) mysql_free_result(res); (tng)
(tng) (tng)
(tng) // (tng) Close (tng) the (tng) connection (tng)
(tng) mysql_close(mysql); (tng)
(tng) (tng)
(tng) printf("\nPrint (tng) any (tng) key (tng) to (tng) continue...\n"); (tng)
(tng) getche(); (tng)
(tng) } (tng)
(tng) (tng)
(tng) 如果有问题，请加入mysql++.lib (tng) (tng) (tng) (tng)
(tng) (tng) (tng) (tng) void mysql_close(MYSQL *connection);关闭一个连接?br />3Q?tng) (tng) (tng) (tng)?执行SQL语句
mysql_select_dbQMYSQL *connection,const char *db_nameQ?选定某个数据库?br /> (tng) (tng) (tng) (tng) int mysql_query(MYSQL *connection,const char *query)//他将执行query语句Q运行成功将q回0Q例如mysql_query(conn_ptr, Create table cert_info(...),创Z个名为cert_info的表Q几乎所有的SQL语句都能q么执行。呵呵，是不是显得很单，他就和命令行中输入的SQL语句差不多。在使用上面函数的时候一般会(x)使用
(tng) (tng) (tng) (tng) my_ulonglong mysql_affected_rows(MYSQL *connection)Q这个函数返回的是mysql_query对进行改动的行的数量?br />4Q?tng) (tng) (tng) (tng)?处理(g)索到的数?br />当我们可以执行SQL语句以后Q那么就很容易执行增加删除修改等操作Q但是假若检索出来的数据存储在哪里呢Q?br /> (tng) (tng) (tng) (tng) MYSQL_RES *mysql_use_result(MYSQL *connection)q个函数得到一个连接对象返回一个结果集合指针，出错时返回NULL。不q他只是q回一个集合对象初始化来接收数据，q没有将M(g)索到的数据返回到l果集合中?br /> (tng) (tng) (tng) (tng) MYSQL_ROW mysql_fetch_row(MYSQL_RES *result)q个函数获得mysql_use_resul得到的结果结构体Qƈ从中(g)索单个行Qƈq回分配l行l构体的数据Q没有更多数据或出错Ӟq回NULL?br /> (tng) (tng) (tng) (tng) Unsigned int mysql_field_count(MYSQL *connection)它得C个连接对象ƈq回在集合中字段的数目?br />于是有上面的基础我们可以理解下面这D了(jin)Q（没有错误处理Q?br />mysql_init(&conn_ptr);
mysql_real_connect(conn_ptr,"localhost","sagely","secret","ra",0,NULL,0);
mysql_query(conn_ptr,"SELECT * form usr_info);
res_ptr=mysql_use_result(&conn_ptr);
sqlrow=mysql_fetch_row(res_ptr);
for(int i=0;i<mysql_field_count(&conn_ptr);i++){printf("%s ",sqlrow);}
(tng) (tng) (tng) (tng) MYSQL_FIELD *mysql_fetch_field(MYSQL_RES *result)它返回的是列的信息，比如列的名称Q列所在表名称{等Q有?jin)这个就可以列标题(sh)数据想对应h?jin)?br />
]]>
2Q一个类拯的函敎ͼ要求用C?br />例如Q?br />class A {
int a;
public:
int b;
};
class B {
…?br />…?br />};
int main() {
A aa, bb;
B c, d;
a.a = 10; a.b = 20;
copyclass(???);// aa拯到bb
?
copyclass(???);// c拯到d
return 0;
}
3在一个项目中Q你被分配到一个小dQ在一个字W串str中包含字W串str_aQ找出所有在字符串str中的str_aQ要求你架构q个功能块ƈ且给Z用说明，代码q行健壮q且性能为首要?br />
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
1、while(*a++=*b++);
2、memcpy(&bb, &aa, sizeof(A));
memcpy(&d, &c, sizeof(B));
3、BOOL FindString(const char *srcQ?const char *str_a)
{
(tng) (tng) char *pStart=(char *)src;
(tng) (tng) if(NULL==pStart || NULL==str_a) return FALSE;
(tng) (tng) char *pCursor=pStart;
(tng) (tng) while(pCursor=strstr(pCursor, str_a))
(tng) {
(tng) (tng) (tng) (tng) printf("find (%s) at position %ld\r\n"), str_a, pCursor-pStart); (tng) (tng)
(tng) }
(tng) return TRUE; (tng)
}
]]>
{
/* 若串 S 中从W?/span> pos(S 的下?/span> 0 ?/span> pos<StrLength(S)) 个字W?/span>
起存在和?/span> T 相同的子Ԍ则称匚w成功Q返回第一?/span>
q样的子串在?/span> S 中的下标Q否则返?/span> -1 (tng) (tng) (tng) */
int i = pos, j = 0;
while ( S[i+j] != '\0'&& T[j] != '\0')
if ( S[i+j] == T[j] )
j ++; // l箋(hu)比较后一字符
else
{
i ++; j = 0;
//
重新开始新的一轮匹?/span>
}
if ( T[j] == '\0')
return i; // 匚w成功 (tng) (tng) q回下标
else
return -1; // ?/span> S ?/span> ( W?/span> pos 个字Wv ) 不存在和?/span> T 相同的子?/span>
}
// Index_BF
]]>
void main()
{
(tng) (tng) (tng) (tng) int i;
(tng) (tng) (tng) (tng)
(tng) (tng) (tng) (tng) if(i = -1)
(tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) printf("True!\n");
(tng) (tng) (tng) (tng) else
(tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) printf("False!\n");
(tng) (tng) (tng) (tng)
(tng) (tng) (tng) (tng) if(i = 0)
(tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) printf("True!\n");
(tng) (tng) (tng) (tng) else
(tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) printf("False!\n");
}
l果是什么？Z么呢Q?img src ="http://www.shnenglu.com/qiaodong/aggbug/14966.html" width = "1" height = "1" />
]]>
void test1()
{
(tng) (tng)char string[10];
(tng) (tng)char* str1 = "0123456789";
(tng) (tng) (tng) (tng)strcpy( string, str1 );
}
试题2Q?br />
void test2()
{
(tng) (tng)char string[10], str1[10];
(tng) (tng) (tng) (tng)int i;
(tng) (tng) (tng) (tng)for(i=0; i<10; i++)
(tng) (tng) (tng) (tng){
(tng) (tng) (tng) (tng) (tng) (tng)str1 = 'a';
(tng) (tng) (tng) (tng)}
(tng) (tng) (tng) (tng)strcpy( string, str1 );
}
试题3Q?br />
void test3(char* str1)
{
(tng) (tng)char string[10];
(tng) (tng)if( strlen( str1 ) <= 10 )
(tng) (tng) (tng) (tng){
(tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng)strcpy( string, str1 );
(tng) (tng) (tng) (tng)}
}
解答Q?br />
试题1字符串str1需?1个字节才能存放下Q包括末’\0’）(j)Q而string只有10个字节的I间Qstrcpy?x)导致数l越界；
对试?Q如果面试者指出字W数lstr1不能在数l内l束可以l?分；如果面试者指出strcpy(string, str1)调用使得从str1内存起复制到string内存h复制的字节数h不确定性可以给7分，在此基础上指出库函数strcpy工作方式的给10分；
对试?Qif(strlen(str1) <= 10)应改为if(strlen(str1) < 10)Q因为strlen的结果未l计’\0’所占用?个字节?br />
剖析Q?br />
考查对基本功的掌握：(x)
Q?Q字W串以’\0’结；
Q２Q对数组界把握的敏感度Q?br />
Q３Q库函数strcpy的工作方式，如果~写一个标准strcpy函数的dgؓ(f)10Q下面给出几个不同得分的{案Q?br />
2?br />
void strcpy( char *strDest, char *strSrc )
{
while( (*strDest++ = * strSrc++) != ‘\0?);
}
4?br />void strcpy( char *strDest, const char *strSrc )
//源字符串加constQ表明其入参敎ͼ??br />{
while( (*strDest++ = * strSrc++) != ‘\0?);
}
7?br />void strcpy(char *strDest, const char *strSrc) (tng) (tng)
{
//Ҏ(gu)地址和目的地址加非0断言Q加3?br /> assert( (strDest != NULL) && (strSrc != NULL) );
while( (*strDest++ = * strSrc++) (tng) (tng)!= (tng) (tng)‘\0?);
}
10?br />
//Z(jin)实现铑ּ操作Q将目的地址q回Q加3分！
char * strcpy( char *strDest, const char *strSrc ) (tng) (tng)
{
assert( (strDest != NULL) && (strSrc != NULL) );
char *address = strDest; (tng) (tng)
while( (*strDest++ = * strSrc++) != ‘\0?);
(tng) (tng)return address;
}
cM的我们可以写Z?0分的strlen函数
int strlen( const char *str ) (tng) (tng) //输入参数const
{
(tng) (tng) (tng) (tng)assert( strt != NULL ); (tng) (tng) //断言字符串地址?
(tng) (tng) (tng) (tng)int len;
(tng) (tng) (tng) (tng)while( (*str++) != '\0' )
(tng) (tng) (tng) (tng){ (tng) (tng)
(tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng)len++;
(tng) (tng) (tng) (tng)}
(tng) (tng) (tng) (tng)return len;
}
]]>
一直以L(fng)Ҏ(gu)比较好？但是今天把MSDN里的一个例子拿出来攑֜最大警报别下竟莫名其妙的出现?jin)一个初始化问题Q想不?br />
]]>