C++ 数字与字符串之间的转换代码

#include#include#includeusing namespace std;int main(int argc, char const *argv[]){
	//字符串转数字 1
	string str1="1234";
	int i; 
	stringstream ss1; 
	ss1<<str1;
	ss1>>i;
	cout<<i<<endl;
	
	//字符串转数字 2
	string str="123";
	const char*s = str.c_str();
	cout<<atoi(s)<<endl;

	//数字转字符串
	string str2;
	stringstream ss2; 
	int a=1024;
	ss2<<a;
	ss2>>str2;
	cout<<str2<<endl; 
	cout<<to_string(a)<<endl;
	
	return 0;}

注：

• 函数原型：
  string to_string (int val);
  string to_string (long val);
  string to_string (long long val);
  string to_string (unsigned val);
  string to_string (unsigned long val);
  string to_string (unsigned long long val);
  string to_string (float val);
  string to_string (double val);
  string to_string (long double val);