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PHP, 51 45 43 37 characters

function f($n){return~~$n-(~~$n>$n);} This should be able to be applied to most languages that do not support the n%1 trick.

PHP, 51 45 43 37 characters

function f($n){return~~$n-(~~$n>$n);}

This should be able to be applied to most languages that do not support the n%1 trick.

PHP, 51 45 43 characters

function f($n){return(int)$n-((int)$n>$n);} This should be able to be applied to most languages that do not support the n%1 trick.

PHP, 51 45 43 37 characters

function f($n){return~~$n-(~~$n>$n);} This should be able to be applied to most languages that do not support the n%1 trick.

PHP, 51 characters

function f($n){return(int)$n>$n?(int)$n-1:(int)$n;} This should be able to be applied to most languages that do not support the n%1 trick.

PHP, 51 45 43 characters

function f($n){return(int)$n-((int)$n>$n);} This should be able to be applied to most languages that do not support the n%1 trick.