hello world program works

hello_world.cpp

@@ -0,0 +1,15 @@
+#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("eeeeh bin non mec", img);
+	// wait for a key press to exit the program
+	cv::waitKey(0);
+	return 0;
+}

makefile

@@ -1,9 +1,15 @@
-all: main arithmetic
-	g++ arithmetic.o main.o -L/usr/lib/x86_64-linux-gnu -lopencv_core
+all: hello_world
+	g++ hello_world.o -o hello_world -L/usr/lib/x86_64-linux-gnu -lopencv_core -lopencv_highgui -lopencv_imgproc
+
 main: main.cpp
 	g++ -c main.cpp -I/usr/include/opencv4
+
 arithmetic: arithmetic.cpp arithmetic.h
 	g++ -c arithmetic.cpp
+
+hello_world: hello_world.cpp
+	g++ -c hello_world.cpp -I/usr/include/opencv4/opencv2 -I/usr/include/opencv4
+
 clean:
 	rm *.o
 	rm a.out