#Fix compilation

practice/.gitignore

@@ -0,0 +1,3 @@
+main
+
+*.o

practice/Makefile

@@ -1,6 +1,8 @@
-main: main.o
-
-main.o: main.c
+CPPFLAGS=-mrdrnd
+
+all: main
+
+main: main.cc
 
 clean:
 	rm main main.o

practice/main.cc

@@ -1,16 +1,88 @@
 #include <iostream>
+#include <cstdlib>
+#include <cstdio>
+#include <immintrin.h>
+#include <vector>
+#include <sys/random.h>
 
 using namespace std;
 
+int get_random_std()
+{
+    return rand() % 200;
+}
+
+int get_random_rdrand()
+{
+    unsigned int ret;
+
+    int rc = _rdrand32_step(&ret);
+
+    if (rc == 1)
+        return ret;
+    else
+        return -1;
+}
+
+int get_random_dev_urandom()
+{
+    int ret, read;
+
+    FILE *urandom = fopen("/dev/urandom", "r");
+
+    read = fread(&ret, sizeof(ret), 1, urandom);
+
+    fclose(urandom);
+
+    if (read > 0)
+        return ret;
+    else
+        return -1;
+}
+
+int get_random_getrandom()
+{
+    int ret, read;
+
+    read = getrandom(&ret, sizeof(ret), 0);
+
+    if (read > 0)
+        return ret;
+    else
+        return read;
+}
+
+int get_random(int (*random_func)())
+{
+    return random_func() % 200;
+}
+
+typedef int (*fp)();
+
 int main()
 {
     int n;
 
     cout << "Please enter a number" << endl;
     cin >> n;
 
+    uint32_t rnd;
+
+    srand((unsigned) time(NULL));
+
+    vector<fp> randoms = { get_random_getrandom, get_random_dev_urandom, get_random_rdrand, get_random_std };
+
     for (int i = 0; i <= 5; i++)
-        n += 1;
+    {
+        if (get_random(randoms[i % 4]) == 150)
+        {
+            n += 1;
+        }
+        else
+        {
+            i--;
+        }
+    }
 
     cout << "Your number + 5 is: " << n << endl;