hello_world merging

hello_world.cpp

@@ -0,0 +1,21 @@
+#include "opencv2/opencv.hpp"
+#include "opencv2/highgui/highgui.hpp"
+
+int main() 
+{ 
+ // initialize a matrix of black pixels 
+ cv::Mat img = cv::Mat::zeros(120, 350, CV_8UC3); 
+ 
+ // write text on the image 
+putText(img, "Hello World", cv::Point(15, 70), cv::FONT_HERSHEY_PLAIN, 3, cv::Scalar(0, 255, 0), 
+4); 
+ 
+// display the image 
+imshow("Win", img); 
+ 
+// wait for a key press to exit the program 
+cv::waitKey(0); 
+  
+ return 0; 
+}
+

main.cpp

@@ -1,5 +1,6 @@
 #include <iostream>
 #include "arithmetic.h"
+#include "opencv2/opencv.hpp"
 
 int main()
 {
@@ -7,3 +8,4 @@ int main()
 	std::cout<<"c: "<<add(1,2)<<std::endl;
 	return 0;
 }
+

makefile

@@ -1,12 +1,15 @@
-all: main arithmetic
-	g++ main.o arithmetic.o
+all: main arithmetic hello
+	g++ main.o arithmetic.o -L/usr/lib/x86_64-linux-gnu -lopencv_core 
 
 main: main.cpp
-	g++ -c main.cpp
+	g++ -c main.cpp -I/usr/include/opencv4
 	
 arithmetic: arithmetic.cpp arithmetic.h
 	g++ -c arithmetic.cpp
 	
+hello: hello_world.cpp
+	g++ -c hello_world.cpp -I/usr/include/opencv4
+
 clean:
 	rm *.o
 	rm a.out