C++ 各种类型转换，char，char* ， string，int互转

char 转 string

• const char c = ‘a’；string s；s.push_back(c);

char[ ] 转 string

char* 转 string

• char* p = "hello world", string str = p

string 转 char[ ]

 

string 转 char*

• string str = ”hello world“，const char* p = str.c_str()

char 转 int

• ascii码字符，如‘1’，可用‘1’-‘0’转化为整数

string 转 int

string str = "123"; int num = atoi(str.c_str());

int 转 char

int 转 string

# include<sstream>

# include<fstream>

string num = std::to_string(123)