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Asked: 2026-06-05T23:22:24+00:00

I have trouble figuring out why a simple division like this one always returns

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I have trouble figuring out why a simple division like this one always returns 0.

System.out.println(4091365376L / 4091495462L * 100L);

I suffixed all numbers with Ls so they’re treated as Longs. I keep getting a zero.

I’m trying to calculate the percentage of 4091365376L to 4091495462L. My values are Longs but I’m just looking for a simple Integer value.

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1 Answer

  1. Editorial Team

    You are a victim of integer rounding (actually: truncation). Try this:

    System.out.println(4091365376L * 100L / 4091495462L);

    Prints 99. Or cast to double implicitly:

    System.out.println(100.0 * 4091365376L / 4091495462L);

    Giving 99.99682057572328. Your problem is that 4091495462L is slightly bigger than 4091365376L so when diving them, the result is truncated to 0 (try 3 / 4, if you are not convinced). and 0 times 100 is…

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