# 035. `select case` for conditional execution topic: {ref}`conditionals` > A `select case` construct conditionally executes one block of > constructs or statements depending on the value of a scalar expression > in a select case statement. --- `select case` is more restrictive and clear than an `if` block and should be used when it is possible, especially when there are many branches. ```{literalinclude} ../../src/select-case.f90 :language: fortran :caption: select-case.f90 | | ₀ |

``` ```{code-block} text :caption: Output[^gfortran-version] 0 ??? 1 bad 2 bad 3 medium 4 good 5 good ``` [^gfortran-version]: Compiled using `GNU Fortran (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0` with no flags ---

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— FortranTip (@fortrantip) December 20, 2021