Template:Eval

{{#if:{{#ifexpr:{{{1}}}}}|[expression “{{{1}}}” is wrong]|{{{{{subst|}}}#expr:{{{1}}}}}}}

Template documentation

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Usage

Normal evaluation

• ‟{{eval|3 / 4}}” gives ‟0.75”.
• ‟{{eval|3 * 4}}” gives ‟12”.
• ‟{{eval|3 + 4}}” gives ‟7”.
• ‟{{eval|3 - 4}}” gives ‟-1”.
• ‟{{eval|3 mod 4}}” gives ‟3”.

Error handling

• ‟{{eval|3 / 0}}” gives ‟[expression “3 / 0” is wrong]”, because division by 0 is undefined.
• ‟{{eval|1 + {{eval|3 / 0}}}}” gives ‟[expression “1 + [expression “3 / 0” is wrong]” is wrong]”, this is a case of nested error messages.

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