1 files changed, 8 insertions, 1 deletions
diff --git a/vector/vector.c b/vector/vector.c
index c8a5906..59f48cc 100644
--- a/vector/vector.c
+++ b/vector/vector.c
@@ -1,5 +1,6 @@
 #include <stddef.h>
 #include <stdio.h>
+#include <math.h>
 
 struct vec3 {
     double x;
@@ -64,12 +65,16 @@ struct vec3 vec3_cross(struct vec3 * const v, struct vec3 * const u)
     return result;
 }
 
+double vec3_mag(struct vec3 * const v) {
+    return sqrt((v->x * v->x) + (v->y * v->y) + (v->z * v->z));
+}
+
 void vec3_print(struct vec3 * const v)
 {
     if (v == NULL)
         return;
 
-    printf("<%.2f,%.2f,%.2f>\n", v->x, v->y, v->y);
+    printf("<%.2f,%.2f,%.2f>\n", v->x, v->y, v->z);
 }
 
 
@@ -84,6 +89,8 @@ int main(int argc, char *argv[])
     printf("b = ");
     vec3_print(&b);
 
+    printf("||a|| = %f\n", vec3_mag(&a));
+
     printf("sum a + b     : ");
     res = vec3_add(&a, &b);
     vec3_print(&res);