# Question about reduce?

**URL:** <https://discourse.julialang.org/t/question-about-reduce/82290>\
**Category:** General Usage\
**Tags:** integer-overflow\
**Created:** [June 6, 2022, 2:00am UTC](https://discourse.julialang.org/t/question-about-reduce/82290 "2022-06-06T02:00:43Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Raymond](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/raymond/32/36557_2.png) [@Raymond](https://discourse.julialang.org/u/Raymond)\
**Post date:** [June 6, 2022, 2:00am UTC](https://discourse.julialang.org/t/question-about-reduce/82290/1 "2022-06-06T02:00:43Z")

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What’s wrong with this?

```julia
julia> reduce(*, 1:100)
0

```

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<div class="post-metadata">

**Author:** ![Oscar\_Smith](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/oscar_smith/32/25343_2.png) [@Oscar\_Smith](https://discourse.julialang.org/u/Oscar_Smith)\
**Post date:** [June 6, 2022, 2:06am UTC](https://discourse.julialang.org/t/question-about-reduce/82290/2 "2022-06-06T02:06:07Z")

</div>

integer overflow.

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<div class="post-metadata">

**Author:** ![acsofie](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/acsofie/32/36983_2.png) [@acsofie](https://discourse.julialang.org/u/acsofie)\
**Post date:** [June 6, 2022, 2:32am UTC](https://discourse.julialang.org/t/question-about-reduce/82290/3 "2022-06-06T02:32:30Z")

</div>

```julia
julia> reduce(*, 1:big(100))
93326215443944152681699238856266700490715968264381621468592963895217599993229915608941463976156518286253697920827223758251185210916864000000000000000000000000

```

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<div class="post-metadata">

**Author:** ![Henrique\_Becker](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/henrique_becker/32/15443_2.png) [@Henrique\_Becker](https://discourse.julialang.org/u/Henrique_Becker)\
**Post date:** [June 6, 2022, 2:47am UTC](https://discourse.julialang.org/t/question-about-reduce/82290/4 "2022-06-06T02:47:21Z")

</div>

See [Integers and Floating-Point Numbers · The Julia Language](https://docs.julialang.org/en/v1/manual/integers-and-floating-point-numbers/#Overflow-behavior)