Added task 3.1

Topic-3/task_3_1.c

@@ -0,0 +1,36 @@
+//
+// Written for Computer Networks and Systems lab classes
+// AUTHOR : Sergiusz Warga
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+void child_task() {
+    for (int i = 1; i <= 10; ++i) {
+        printf("%d\n", i);
+        fflush(stdout);
+        if (i < 10) sleep(1);
+    }
+}
+
+int main() {
+    pid_t pid;
+
+    pid = fork();
+
+    if (pid == -1) {    // If something went wrong.
+        perror("Fork: ");
+        exit(EXIT_FAILURE);
+    }
+
+    if (pid == 0) {     // If this is a child process.
+        child_task();
+        exit(EXIT_SUCCESS);
+    }
+
+    wait();
+    printf("END OF WORK\n");
+    return 0;
+}