OpenCV3.4.7, I in the use of CV: : String: : the format () method when the String formatting output in English to return to the code

Knowledge of the English character constants output normal

 string imgname; 
String imgname1; 
String imgPath; 
String imgPath1; 
ImgPath=format (G: \ \ "% s", "DSC02930. JPG");//character constants of English output normal 
Cout & lt; Cout & lt; ImgPath1=format (G: \ \ "% s", imgname1);//the string formatting output in English to return to the code 
Cout & lt; Cout & lt;  

Output: 

 

For the reason