progress

programs/a1/main.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+
+int main(void) {
+    int n;
+
+    printf("Input integer: ");
+    scanf("%d", &n);
+
+    if (n <= 10 && n > 0) {
+        printf("%d is one digit natural number.\n", n);
+    } else {
+    	printf("%d is not one digit natural number.\n", n);
+    }
+
+    return 0;
+}