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author | Nao Pross <naopross@thearcway.org> | 2018-12-09 19:51:20 +0100 |
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committer | Nao Pross <naopross@thearcway.org> | 2018-12-09 19:51:20 +0100 |
commit | e89fb7b93fd5f1042f05107e51fea85f51499668 (patch) | |
tree | 54d298eee08140ec7f1116ecd74c034a1371c043 /vector/vectors.c | |
parent | Update gitignore (diff) | |
download | cplusplus-e89fb7b93fd5f1042f05107e51fea85f51499668.tar.gz cplusplus-e89fb7b93fd5f1042f05107e51fea85f51499668.zip |
Add vector example documentation
Diffstat (limited to 'vector/vectors.c')
-rw-r--r-- | vector/vectors.c | 107 |
1 files changed, 0 insertions, 107 deletions
diff --git a/vector/vectors.c b/vector/vectors.c deleted file mode 100644 index c8a5906..0000000 --- a/vector/vectors.c +++ /dev/null @@ -1,107 +0,0 @@ -#include <stddef.h> -#include <stdio.h> - -struct vec3 { - double x; - double y; - double z; -}; - -struct vec3 vec3_add(struct vec3 * const v, struct vec3 * const u) -{ - struct vec3 result = {0, 0, 0}; - - if (v == NULL || u == NULL) - return result; - - result.x = v->x + u->x; - result.y = v->y + u->y; - result.z = v->z + u->z; - - return result; -} - -struct vec3 vec3_mul(struct vec3 * const v, const double scalar) -{ - struct vec3 result = {0, 0, 0}; - - if (v == NULL) - return result; - - result.x = scalar * v->x; - result.y = scalar * v->y; - result.z = scalar * v->z; - - return result; -} - -struct vec3 vec3_sub(struct vec3 * const v, struct vec3 * const u) -{ - struct vec3 result = {0, 0, 0}; - - result = vec3_mul(u, -1.0); - result = vec3_add(v, &result); - - return result; -} - -double vec3_dot(struct vec3 * const v, struct vec3 * const u) -{ - if (v == NULL || u == NULL) - return 0; - - return (v->x * u->x) + (v->y * u->y) + (v->z * u->y); -} - -struct vec3 vec3_cross(struct vec3 * const v, struct vec3 * const u) -{ - struct vec3 result = {0, 0, 0}; - - result.x = (v->y * u->z) - (v->z * u->y); - result.y = (v->z * u->x) - (v->x * u->z); - result.z = (v->x * u->y) - (v->y * u->x); - - return result; -} - -void vec3_print(struct vec3 * const v) -{ - if (v == NULL) - return; - - printf("<%.2f,%.2f,%.2f>\n", v->x, v->y, v->y); -} - - -int main(int argc, char *argv[]) -{ - struct vec3 a = {1, 2, 3}; - struct vec3 b = {4, 5, 6}; - struct vec3 res; - - printf("a = "); - vec3_print(&a); - printf("b = "); - vec3_print(&b); - - printf("sum a + b : "); - res = vec3_add(&a, &b); - vec3_print(&res); - - printf("sub a - b : "); - res = vec3_sub(&a, &b); - vec3_print(&res); - - printf("product 3*a : "); - res = vec3_mul(&a, 3); - vec3_print(&res); - - printf("dot product : "); - printf("%.2f\n", vec3_dot(&a, &b)); - - printf("cross product : "); - res = vec3_cross(&a, &b); - vec3_print(&res); - - return 0; -} |