printf %f with only 2 numbers after the decimal point?

Question

In my printf, I need to use %f but I\'m not sure how to truncate to 2 decimal places:

Example: getting

3.14159

Answer 1

Use this

printf ("%.2f", 3.14159);

Answer 2

System.out.printf("%.2f", number);

BUT, this will round the number to the nearest decimal point you have mentioned.(As in your case you will get 3.14 since rounding 3.14159 to 2 decimal points will be 3.14)

Since the function printf will round the numbers the answers for some other numbers may look like this,

System.out.printf("%.2f", 3.14136); -> 3.14
System.out.printf("%.2f", 3.14536); -> 3.15
System.out.printf("%.2f", 3.14836); -> 3.15

If you just need to cutoff the decimal numbers and limit it to a k decimal numbers without rounding,

lets say k = 2.

System.out.printf("%.2f", 3.14136 - 0.005); -> 3.14
System.out.printf("%.2f", 3.14536 - 0.005); -> 3.14
System.out.printf("%.2f", 3.14836 - 0.005); -> 3.14