这样转的:
public static void main(String[] args) throws Exception{
double aa = stringToDouble("12.23");
System.out.println("aa:"+aa);
}
String转double保留N位小数:
/**
* String转换成double 保留N位小数。
* @param a
* @return
*/
public static double stringToDouble(String a){
double b = Double.valueOf(a);
DecimalFormat df = new DecimalFormat("#.0");//此为保留1位小数,若想保留2位小数,则填写#.00 ,以此类推
String temp = df.format(b);
b = Double.valueOf(temp);
return b;
}
double 转string
#include <string>
CString strResultx;
strResultx.Format(_T("x:%.4f\n"), 89.7887878);
转换结果还是放在strResultx
两个字符串相连
CString strResulty;
strResultx += strResulty;
参考资料:api
本回答被提问者采纳