add new file l6.c

c/l6.c

@@ -0,0 +1,12 @@
+#include <stdio.h>
+
+int main() {
+    int pol;
+    printf("Enter number ");
+    scanf("%d", &pol);
+    int x1 = pol % 10;
+    int x2 = (pol / 10) % 10;
+    int x3 = ((pol / 10) / 10) % 10;
+    int sum = x1+x2+x3;
+    printf("%d\n", sum);
+}