From 9e48c9a339cde73fb7477f252e98efe0fc6d8de0 Mon Sep 17 00:00:00 2001 From: Chris Boesch Date: Wed, 28 Feb 2024 13:01:11 +0100 Subject: Added notes to exercise 94 c_math. --- exercises/094_c_math.zig | 23 +++++++++++++++-------- 1 file changed, 15 insertions(+), 8 deletions(-) (limited to 'exercises/094_c_math.zig') diff --git a/exercises/094_c_math.zig b/exercises/094_c_math.zig index e650f6e..61e2c7b 100644 --- a/exercises/094_c_math.zig +++ b/exercises/094_c_math.zig @@ -1,19 +1,26 @@ // // Often, C functions are used where no equivalent Zig function exists -// yet. Since the integration of a C function is very simple, as already +// yet. Okay, that's getting less and less. ;-) +// +// Since the integration of a C function is very simple, as already // seen in the last exercise, it naturally offers itself to use the // very large variety of C functions for our own programs. // As an example: // // Let's say we have a given angle of 765.2 degrees. If we want to // normalize that, it means that we have to subtract X * 360 degrees -// to get the correct angle. How could we do that? A good method is -// to use the modulo function. But if we write "765.2 % 360", it won't -// work, because the standard modulo function works only with integer -// values. In the C library "math", there is a function called "fmod"; -// the "f" stands for floating and means that we can solve modulo for -// real numbers. With this function, it should be possible to normalize -// our angle. Let's go. +// to get the correct angle. +// How could we do that? A good method is to use the modulo function. +// But if we write "765.2 % 360", it only works with float values +// that are known at compile time. +// In Zig, we would use %mod(a, b) instead. +// +// Let us now assume that we cannot do this in Zig, but only with +// a C function from the standard library. In the library "math", +// there is a function called "fmod"; the "f" stands for floating +// and means that we can solve modulo for real numbers. With this +// function, it should be possible to normalize our angle. +// Let's go. const std = @import("std"); -- cgit v1.2.3-70-g09d2