hello_world merging

arithmetic.cpp

@@ -0,0 +1,6 @@
+#include "arithmetic.h"
+int add(int a, int b)
+{
+	int c = a+b;
+	return c;
+}

arithmetic.h

@@ -0,0 +1 @@
+int add(int, int);

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

@@ -0,0 +1,11 @@
+#include <iostream>
+#include "arithmetic.h"
+#include "opencv2/opencv.hpp"
+
+int main()
+{
+	std::cout<<"Hello world!"<<std::endl;
+	std::cout<<"c: "<<add(1,2)<<std::endl;
+	return 0;
+}
+

makefile

@@ -0,0 +1,15 @@
+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 -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