其它类型转string:

 1 #include <iostream>
 2 #include <string>
 3 using namespace std;
 4 int main()
 5 {
 6  int a = 55;
 7  double b = 65.123;
 8  string str = "";
 9  //头文件是sstream
10  std::ostringstream oss;
11  oss << a << "---" << b;
12  str = oss.str();
13  cout << str << endl;
14  return 0;
15 }

输出是55—65.123。

如果想实现小数点后只显示一位数字，使用下面方法：

 1 #include <iostream>
 2 #include <sstream>
 3 #include <iomanip>
 4   
 5 template <class T>
 6 std::string fmt(T in, int width = 0, int prec = 0) {
 7     std::ostringstream s;
 8     s << std::setw(width) << std::setprecision(prec) << in;
 9     return s.str();
10 }
11   
12 int main(){
13     std::string s = fmt(66.0 / 30.0, 2, 2);
14     std::cout << s << "\n";
15 }