Re: Idiomatic D code to avoid or detect devision by zero
On Monday, 3 August 2020 at 15:33:54 UTC, Dominikus Dittes Scherkl wrote: [...] For really long expressions you could also split it on multiple lines: c = (b_expression == 0) ? (d_longer_expression) : (a_expression/b_expression); +1 looks clean!
Re: Idiomatic D code to avoid or detect devision by zero
On Monday, 3 August 2020 at 14:50:36 UTC, Steven Schveighoffer wrote: On 8/3/20 5:53 AM, Martin Tschierschke wrote: I prefer putting additional bracket around For really long expressions you could also split it on multiple lines: c = (b_expression == 0) ? (d_longer_expression) : (a_expression/b_expression);
Re: Idiomatic D code to avoid or detect devision by zero
On 8/3/20 5:53 AM, Martin Tschierschke wrote: On Friday, 31 July 2020 at 14:18:15 UTC, Steven Schveighoffer wrote: On 7/31/20 9:55 AM, Martin Tschierschke wrote: What would be the idiomatic way to write a floating point division occuring inside a loop and handle the case of division by zero. c = a/b; // b might be zero sometimes, than set c to an other value (d). (In the moment I check the divisor being zero or not, with an if-than-else structure, but I find it ugly and so I ask here.) c = b == 0 ? d : a/b; I don't think a function would be shorter or clearer... c = div(a, b, d); Alternatively, you could use a type to effect the behavior you want. Thanks, for the hints. I find the ? : - expressions sometimes hard to reed, especially when a and b are not so simple expressions. I prefer putting additional bracket around: c = (b_expression == 0) ? (d_longer_expression) : (a_expression/b_expression); Yes, that is fine, and up to your preference. You may actually need the parentheses if the expressions somehow override the precedence of the ?: operator. Even with symbol uses, I personally would do actually: c = (b == 0 ? d : a/b); Just because the ` = b == ` looks really bad to me. -Steve
Re: Idiomatic D code to avoid or detect devision by zero
On Friday, 31 July 2020 at 14:18:15 UTC, Steven Schveighoffer wrote: On 7/31/20 9:55 AM, Martin Tschierschke wrote: What would be the idiomatic way to write a floating point division occuring inside a loop and handle the case of division by zero. c = a/b; // b might be zero sometimes, than set c to an other value (d). (In the moment I check the divisor being zero or not, with an if-than-else structure, but I find it ugly and so I ask here.) c = b == 0 ? d : a/b; I don't think a function would be shorter or clearer... c = div(a, b, d); Alternatively, you could use a type to effect the behavior you want. -Steve Thanks, for the hints. I find the ? : - expressions sometimes hard to reed, especially when a and b are not so simple expressions. I prefer putting additional bracket around: c = (b_expression == 0) ? (d_longer_expression) : (a_expression/b_expression); ???
Re: Idiomatic D code to avoid or detect devision by zero
On Friday, 31 July 2020 at 15:19:25 UTC, Andrea Fontana wrote: On Friday, 31 July 2020 at 13:55:18 UTC, Martin Tschierschke wrote: What would be the idiomatic way to write a floating point division occuring inside a loop and handle the case of division by zero. c = a/b; // b might be zero sometimes, than set c to an other value (d). (In the moment I check the divisor being zero or not, with an if-than-else structure, but I find it ugly and so I ask here.) You should give a look at: https://dlang.org/phobos/std_experimental_checkedint.html You can try with checked!Throw and catch exceptions, for example. Andrea Thanks, I will look at it.
Re: Idiomatic D code to avoid or detect devision by zero
On Friday, 31 July 2020 at 13:55:18 UTC, Martin Tschierschke wrote: What would be the idiomatic way to write a floating point division occuring inside a loop and handle the case of division by zero. c = a/b; // b might be zero sometimes, than set c to an other value (d). (In the moment I check the divisor being zero or not, with an if-than-else structure, but I find it ugly and so I ask here.) You should give a look at: https://dlang.org/phobos/std_experimental_checkedint.html You can try with checked!Throw and catch exceptions, for example. Andrea
Re: Idiomatic D code to avoid or detect devision by zero
On 7/31/20 9:55 AM, Martin Tschierschke wrote: What would be the idiomatic way to write a floating point division occuring inside a loop and handle the case of division by zero. c = a/b; // b might be zero sometimes, than set c to an other value (d). (In the moment I check the divisor being zero or not, with an if-than-else structure, but I find it ugly and so I ask here.) c = b == 0 ? d : a/b; I don't think a function would be shorter or clearer... c = div(a, b, d); Alternatively, you could use a type to effect the behavior you want. -Steve
