Printing Out Floats Poorly | Handmade Hero Episode Guide

0:28Recap and set the stage for the day

2:29Run the game and refamiliarise ourselves with the code

3:51handmade_shared.h: Fix an ArrayCount() call in FormatStringList()

5:37handmade_shared.h: Introduce F64ToASCII() and consider precision

8:47"I am not a floating point guru"^α

9:06Blackboard: Float Printing

11:37Blackboard: The problematic concept of the decimal point

14:28Blackboard: Breaking this fractional problem down

15:25Internet: modf¹

17:21Blackboard: Summing the fractional parts together

21:00handmade_shared.h: Implement F64ToASCII()

28:36Compile and run, see that our precision looks messed up and investigate why

29:45handmade_shared.h: Make FormatStringList() set Precision if not set, and bake the string reversal code in to U64ToASCII()

37:03Debugger: Step in to U64ToASCII() to take a look at what that does

41:03handmade_shared.h: Endeavour to handle precision correctly

42:31Internet: Consult the printf spec²

42:51"Chrome? Chrooooooome?"^β

46:05handmade_shared.h: Make FormatStringList() handle the Width in accordance with the printf spec

47:18Run the game and see that the printouts are untouched

47:37handmade_shared.h: Make FormatStringList() correctly compute the Precision

49:23Run the game, see the floating point values looking better and consider what the Width specifier actually means

55:00Q&A

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55:00Q&A

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55:00Q&A

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56:26zamar037 Does the float printout account for left or right alignment?

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56:26zamar037 Does the float printout account for left or right alignment?

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56:26zamar037 Does the float printout account for left or right alignment?

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58:17sharlock93 Are we stuck on what something %3d means? I was away

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58:17sharlock93 Are we stuck on what something %3d means? I was away

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58:17sharlock93 Are we stuck on what something %3d means? I was away

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59:17culver_fly Sorry if it sounds rude, but why do you even care about the specs? Why don't you just print whatever you want it to be? I mean, it's your code?

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59:17culver_fly Sorry if it sounds rude, but why do you even care about the specs? Why don't you just print whatever you want it to be? I mean, it's your code?

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59:17culver_fly Sorry if it sounds rude, but why do you even care about the specs? Why don't you just print whatever you want it to be? I mean, it's your code?

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59:48handmade_shared.h: Deduplicate the float cases

1:01:01sharlock93 As far as I know %3.3f means 3 numbers before the decimal and precise to three decimal numbers

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1:01:01sharlock93 As far as I know %3.3f means 3 numbers before the decimal and precise to three decimal numbers

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1:01:01sharlock93 As far as I know %3.3f means 3 numbers before the decimal and precise to three decimal numbers

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1:01:35mmozeiko Use the http://cppreference.com it has better docs than cplusplus.com, and cppreference states it's a minimum width

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1:01:35mmozeiko Use the http://cppreference.com it has better docs than cplusplus.com, and cppreference states it's a minimum width

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1:01:35mmozeiko Use the http://cppreference.com it has better docs than cplusplus.com, and cppreference states it's a minimum width

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1:02:21sharlock93 Guess I have been wrong all this time

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1:02:21sharlock93 Guess I have been wrong all this time

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1:02:21sharlock93 Guess I have been wrong all this time

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1:02:42insofaras Can you say something quotable for test purposes?

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1:02:42insofaras Can you say something quotable for test purposes?

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1:02:42insofaras Can you say something quotable for test purposes?

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1:02:51"I feel like it's hard to say something quotable on demand"^γ

1:03:123ygun Minimum width would make it more consistent across all types of printf

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1:03:123ygun Minimum width would make it more consistent across all types of printf

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1:03:123ygun Minimum width would make it more consistent across all types of printf

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1:03:24programgamer So wait, is it a behavior problem or a bad spec problem?

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1:03:24programgamer So wait, is it a behavior problem or a bad spec problem?

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1:03:24programgamer So wait, is it a behavior problem or a bad spec problem?

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1:04:04elxenoanizd Do you think it's worth implementing a custom string class that uses a custom heap for allocation and disposition of memory instead of dealing directly with null-terminated C-strings (talking mostly for tools programming)?

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1:04:04elxenoanizd Do you think it's worth implementing a custom string class that uses a custom heap for allocation and disposition of memory instead of dealing directly with null-terminated C-strings (talking mostly for tools programming)?

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1:04:04elxenoanizd Do you think it's worth implementing a custom string class that uses a custom heap for allocation and disposition of memory instead of dealing directly with null-terminated C-strings (talking mostly for tools programming)?

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1:04:39sharlock93 Thanks for the stream, have a good evening, going to work, are you gonna stream at this time from now on?

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1:04:39sharlock93 Thanks for the stream, have a good evening, going to work, are you gonna stream at this time from now on?

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1:04:39sharlock93 Thanks for the stream, have a good evening, going to work, are you gonna stream at this time from now on?

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1:05:24macielda Is text printing speed interfering with your profiling accuracy in a significant way?

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1:05:24macielda Is text printing speed interfering with your profiling accuracy in a significant way?

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1:05:24macielda Is text printing speed interfering with your profiling accuracy in a significant way?

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1:05:56torgdor What advantages does this version of printf have over the standard library printf?

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1:05:56torgdor What advantages does this version of printf have over the standard library printf?

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1:05:56torgdor What advantages does this version of printf have over the standard library printf?

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1:08:12longboolean Right now you are padding with zeros, "the spec", at least in one example, looks like it pads with spaces

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1:08:12longboolean Right now you are padding with zeros, "the spec", at least in one example, looks like it pads with spaces

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1:08:12longboolean Right now you are padding with zeros, "the spec", at least in one example, looks like it pads with spaces

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1:08:33elxenoanizd When is the next Handmade Con?³

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1:08:33elxenoanizd When is the next Handmade Con?³

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1:08:33elxenoanizd When is the next Handmade Con?³

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1:10:08music_guru What else is left other than printf that would need to be removed?

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1:10:08music_guru What else is left other than printf that would need to be removed?

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1:10:08music_guru What else is left other than printf that would need to be removed?

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1:13:32longboolean Could you explain briefly why this simple approach of printing floats can lead to precision errors?

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1:13:32longboolean Could you explain briefly why this simple approach of printing floats can lead to precision errors?

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1:13:32longboolean Could you explain briefly why this simple approach of printing floats can lead to precision errors?

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1:14:53zeanith64 Will everything be recorded at HandmadeCon? Considering what nearly happened last year, I'm a little worried

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1:14:53zeanith64 Will everything be recorded at HandmadeCon? Considering what nearly happened last year, I'm a little worried

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1:14:53zeanith64 Will everything be recorded at HandmadeCon? Considering what nearly happened last year, I'm a little worried

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1:16:28Wrap it up

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1:16:28Wrap it up

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1:16:28Wrap it up

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