# 076. Use d0 or \_kind to make a constant double precision.
topic: {ref}`data-types`
```{note}
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```
Use d0 or _kind to make a constant double precision. Merely having many decimal places in a literal constant does not do so.
real(kind(1.0d0)) :: pi
pi = 3.14159265358979323846 ! RHS is single precision
probably does not do what the programmer intends!
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