Why %8.5f is usd whn %.5f also dies d same job?

Question

printf("Pi = %8.5f \n", 3.14159);
/* Pi = 3.14159 */

Answer 1

While it doesn't matter for that number, to have columns of numbers line up correctly it becomes important.

printf("%8.5f\n", 3.14159);
printf("%8.5f\n", 13.14159);
printf("%8.5f\n", 123.14159);

Would display:
3.14159
13.14159
123.14159

Note: 8 is a suggested minimum so the last gets 9.