How use Printf in ma proj

Question

I’m new in Java. I want use printf to print a double number. When I use println, it work correctly. But use either System.out.printf("%.2d\n" + s.avrage); or System.out.printf("%.2f\n" + s.avrage); a java.util.IllegalFormatPrecisionException occurred.

possible duplicate of [how do I use System.out.printf?](http://stackoverflow.com/questions/18730978/how-do-i-use-system-out-printf) — Mansueli, Aug 14 '14 at 19:02

score 0 · Answer 1 · edited Aug 14 '14 at 20:07

0

It should be something like this

    float f = 12.0f;
    System.out.printf("%.2f", f);

edited Aug 14 '14 at 20:07

Khantahr

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answered Aug 14 '14 at 19:05

SparkOn

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score 0 · Accepted Answer · answered Aug 14 '14 at 19:13

The problem with your attempt,

System.out.printf("%.2f\n" + s.avrage);

Is you are using a + which results in String concatenation, instead of passing the second (expected) argument to printf. You wanted something like,

System.out.printf("%.2f\n", s.avrage); // <-- comma, not plus

How use Printf in ma proj

2 Answers2