2 files changed, 52 insertions, 0 deletions
diff --git a/rushs/evalexpr/sieve_eratosthenes_advanced/Makefile b/rushs/evalexpr/sieve_eratosthenes_advanced/Makefile
new file mode 100644
index 0000000..c7e35f9
--- /dev/null
+++ b/rushs/evalexpr/sieve_eratosthenes_advanced/Makefile
@@ -0,0 +1,13 @@
+CC=gcc
+CFLAGS=-std=c99 -Wall -Wextra -Werror -Wvla -pedantic
+LDLIBS=
+
+all: sieve.o
+
+sieve.o: sieve.c
+	$(CC) $(CFLAGS) -c -o sieve.o sieve.c
+
+.PHONY: clean
+
+clean:
+	rm sieve.o
diff --git a/rushs/evalexpr/sieve_eratosthenes_advanced/sieve.c b/rushs/evalexpr/sieve_eratosthenes_advanced/sieve.c
new file mode 100644
index 0000000..7dd4816
--- /dev/null
+++ b/rushs/evalexpr/sieve_eratosthenes_advanced/sieve.c
@@ -0,0 +1,39 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+void sieve(int n)
+{
+    if (n <= 2)
+    {
+        return;
+    }
+
+    // Generate array
+    int *a = calloc(n, sizeof(int));
+    int count = 0;
+
+    // Actual sieve and count
+    for (int i = 2; i < n; i++)
+    {
+        if (a[i] == 0)
+        {
+            for (int k = 2 * i; k < n; k += i)
+            {
+                a[k] = 1;
+            }
+        }
+    }
+
+    for (int i = 2; i < n; i++)
+    {
+        if (a[i] == 0)
+        {
+            count++;
+        }
+    }
+
+    // Print the count
+    printf("%d\n", count);
+
+    free(a);
+}