diff --git a/random.c b/random.c
new file mode 100644
index 0000000..8deb622
--- /dev/null
+++ b/random.c
@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <stdlib.h>
+int random_int(int max)
+{
+return rand() % max;
+}
+int main(int argc, char *argv[])
+{
+if (argc != 2) {
+fprintf(stderr, "Usage: %s <number>\n", argv[0]);
+return EXIT_FAILURE;
+}
+int max = atoi(argv[1]);
+int result = random_int(max);
+printf("%d\n", result);
+return EXIT_SUCCESS;
+}