[형변환 정리] String<->char , char<->int, int<->String

int<->String

• int-> string
  • string str = to_string(num;
• string -> int
  • int num = stoi(str)

String<->char 

• char ->string
  • string str(ch)
• string ->char
  • strcpy(ch, str.c_str()); //쓸일딱히없음.

 

char<->int

• char -> int
  • int num = ch-'0';
• int ->char

 

	//string -> int
	string s1="123";
	int n1 = stoi(s1);
	//int - >string
	int n2=100;
	string s2 = to_string(n2);


	//char->string
	char ch1[] = { "jiji" };
	char *ch2 = "123";
	string s3(ch1);
	string s4(ch2);

	//string ->char
	char ch[100];
	string a = "I wanna go to bed";
	strcpy_s(ch, a.c_str());
 

	//char -> int
	char ch3='100';
	int num = ch3 - '0';