1 files changed, 17 insertions, 0 deletions

diff --git a/utils.c b/utils.c
new file mode 100644
index 0000000..ce3dcd4
--- /dev/null
+++ b/utils.c
@@ -0,0 +1,17 @@
+#include "utils.h"
+#include <ctype.h>
+#include <string.h>
+
+/**
+ * Returns whether or not a string is a number.
+ */
+int is_number(char *str)
+{
+	size_t len = strlen(str);
+	for (int c = 0; c < len; c++)
+	{
+		if (!isdigit(str[c]))
+			return 0;
+	}
+	return 1;
+}
\ No newline at end of file