added more code

CPE435/Lab2/lab2_ex1.cpp

@@ -0,0 +1,23 @@
+using namespace std;
+#include <iostream>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <sys/wait.h>
+
+int main(int argc, char * argv[])
+{
+	int val = 0;
+    int pid;
+    pid = fork();
+    if (pid == 0 ) /* we are the child */
+	{
+        val=+2;
+		cout << "Id: " << getpid() << "\tVal: " <<  val << endl;
+	}
+    else //(getpid > 0) // we are the parent
+    {
+        val=+5;
+        cout << "Id: " << getpid() << "\tVal: " <<  val  << endl;
+    }
+}

CPE435/Lab2/lab2_ex2.cpp

@@ -0,0 +1,61 @@
+using namespace std;
+#include <iostream>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <sys/wait.h>
+
+void mult(int x, int y, int id);
+
+void sub(int x, int y, int id);
+
+void add(int x, int y, int id);
+
+int main(int argc, char * argv[])
+{
+    int pid;
+    cout << "Parent's PID: " << getpid() << endl;
+    pid = fork();
+    if (pid == 0 ) // child1
+	{
+        int pidChild2;
+		sub(4, 5, getpid());
+
+        // child1 subtracts numbers
+        pidChild2 = fork(); // child2
+        if (pidChild2 == 0)
+        {
+            add(4, 5, getpid()); 
+            exit(0);
+        }
+        else // child1
+        {
+            wait(0);
+            mult(4, 5, getpid());
+            exit(0);
+        }
+	}
+    else // parent of both
+    {
+        wait(0);
+    }
+}
+
+void mult(int x, int y, int id)
+{
+    cout << "4*5 = " << x*y << endl;
+    cout << "Child1's ID: " << id << endl;
+}
+
+void sub(int x, int y, int id)
+{
+    cout << "4-5 = " << x-y << endl;
+    cout << "Child1's ID: " << id << endl;
+}
+
+
+void add(int x, int y, int id)
+{
+    cout << "4+5 = " << x+y << endl;
+    cout << "Child2's ID: " << id << endl;
+}

CPE435/Lab2/lab2_ex3.cpp

@@ -0,0 +1,28 @@
+using namespace std;
+#include <iostream>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <unistd.h>
+int main(int argc, char * argv[])
+{
+	int proc;
+	int x;
+	cout << "Please enter a number of processes to spawn: ";
+	cin >> proc;
+	if((proc % 2) != 0)
+	{
+		cout << "Odd number entered. Please enter an even number. Exiting now." << endl;
+		return(0);
+	}
+	
+    for(int i=0; i<proc; i++){
+        x = fork();
+	    if (x == 0 ) /* we are the child */
+	    {
+		    cout << "Id: " << getpid() << endl;
+		    exit(0);
+	    }
+	   // cout << "I am the parent, the child's pid is " << x << endl;
+    }
+	//exit(0);
+}

CPE435/Lab2/lab2_ex4.cpp

@@ -0,0 +1,9 @@
+using namespace std;
+#include <iostream>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <unistd.h>
+int main(int argc, char * argv[])
+{
+	
+}

CPE435/Lab2/lab2_ex4_orphan.cpp

@@ -0,0 +1,22 @@
+using namespace std;
+#include <iostream>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <unistd.h>
+int main(int argc, char * argv[])
+{
+	int pid;  
+	pid = fork();  
+	if (pid == 0)  {                    
+		printf("I am the child, my process id is %d\n",getpid( ));
+		printf("the child’s parent process id is %d\n",getppid( ));
+  		sleep(20); 
+ 		printf("I am the child, my process id is %d\n",getpid( ));
+ 		printf("I am the child, parent's  process id is %d\n",getppid( ));
+	} else 
+	{ 
+ 		printf("I am the parent, my process id is %d\n",getpid( ));
+ 		printf("the parents parent process id is %d\n",getppid( ));
+	}
+}

CPE435/Lab2/lab2_ex4_sleeping.cpp

@@ -0,0 +1,11 @@
+using namespace std;
+#include <iostream>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <unistd.h>
+int main(int argc, char * argv[])
+{
+	sleep(50);              
+	printf("Hello World");
+}

CPE435/Lab2/lab2_ex4_zombie.cpp

@@ -0,0 +1,14 @@
+using namespace std;
+#include <iostream>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <unistd.h>
+int main(int argc, char * argv[])
+{
+	if (fork  ( ) > 0)      
+	{    
+		printf("parent\n");    
+		sleep(50);
+	}
+}