Sprintf and cv:: puttext

void cv::putText(
	cv::Mat& img, //  The image to be drawn 
	const string& text, //  The text to be drawn 
	cv::Point origin, //  Bottom left corner of text box 
	int fontFace, //  typeface  ( Such as cv::FONT_HERSHEY_PLAIN)
	double fontScale, //  Size factor , The larger the value, the larger the text 
	cv::Scalar color, //  The color of the line （RGB）
	int thickness = 1, //  Line width 
	int lineType = 8, //  Linetype （4 Neighborhood or 8 Neighborhood , Default 8 Neighborhood ）
	bool bottomLeftOrigin = false // true='origin at lower left'
);

	char tem[100];


	int a = 10;
	double b = 10.234123;
	std::string sss = "kkkk";

	char tem[100];
	sprintf(tem, "int:%d,double:%.2lf,str:%s", a, b, sss);

	double b2 = 2222.7689;
	sprintf(tem, "%s,double2:%.4lf", tem,b2);


	cv::putText(img,tem,cv::Point(100,100),cv::FONT_HERSHEY_PLAIN,1,cv::Scalar(255,0,255),1);