1.将字符串转换为整数：
函数分类：
double atof(const char *string);
double _wtof(const wchar_t *string);
int atoi(const char *string);
_int64 atoi(const char *string);
int _wtoi(const wchar_t *string);
_int64 _wtoi64(const wchar_t *string);
long atol(const char *string);
long _wtol(const wchar_t *string);
2.其他数据类型转换为字符串
函数分类：
2.1 int 转换为字符串：
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);
2.2 long转换为字符串：
char *ltoa(long value, char *string, int radix);
wchar_t *ltow(long value, wchar_t *string, int radix);
2.3 double转换为字符串：
char *_fcvt(double value, int count, int *dec, int *sign);