code compiles with makefile and displays text

makefile

@@ -0,0 +1,14 @@
+
+
+all: ppg
+	g++ -o ppg_program ppg.o
+
+
+ppg:
+	g++ -c ppg.cpp
+
+
+
+clean:
+	rm *.o
+	rm a.out

ppg.cpp

@@ -0,0 +1,13 @@
+
+
+#include<iostream>
+
+
+
+
+int main()
+{
+    std::cout<<"PPG algorithm"<<std::endl;
+    
+    return 0;
+}