▲字符（串）轉換爲數字
double atof( const char *string );
int atoi( const char *string );
__int64 _atoi64( const char *string );
long atol( const char *string );
▲將整形數字按指定的進制轉換成字符（串）
char *_itoa( int value, char *string, int radix );
char *_i64toa( __int64 value, char *string, int radix );
char * _ui64toa( unsigned _int64 value, char *string, int radix );
wchar_t * _itow( int value, wchar_t *string, int radix );
wchar_t * _i64tow( __int64 value, wchar_t *string, int radix );
wchar_t * _ui64tow( unsigned __int64 value, wchar_t *string, int radix );
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