Add problem 10 solution

CMakeLists.txt

@@ -12,3 +12,5 @@ set(proj_include "include")
 target_sources(${PROJECT_NAME} PRIVATE "${proj_sources}")
 target_include_directories(${PROJECT_NAME} PRIVATE "${proj_include}")
 
+target_link_libraries(${PROJECT_NAME} m)
+

include/p10.h

@@ -0,0 +1,7 @@
+#ifndef P10_H
+#define P10_H
+
+void calculate_magnitudes(double (*vectors)[8], int num_vectors, double *out_magnitudes);
+
+#endif
+

src/main.c

@@ -9,6 +9,7 @@
 #include "p7.h"
 #include "p8.h"
 #include "p9.h"
+#include "p10.h"
 
 void print_int_arr(int* arr, int size) {
 	for (int i = 0; i < size; ++i) {
@@ -114,6 +115,23 @@ int main(void) {
 		printf("Did not find any matching products!\n");
 	}
 
+	// Problem 10
+	printf("Problem 10:\n");
+
+	double vectors[3][8] = {
+		{ 1, 2, 3, 4, 5, 6, 7, 8 },
+		{ 0, 0, 0, 0, 0, 5, 0, 0 },
+		{ 1, 1, 1, 1, 1, 1, 1, 1 },
+	};
+
+	double magnitudes[3] = { 0 };
+
+	calculate_magnitudes(vectors, 3, magnitudes);
+
+	for (int i = 0; i < 3; ++i) {
+		printf("magnitude %d: %.2lf\n", i, magnitudes[i]);
+	}
+
 	return 0;
 }
 

src/p10.c

@@ -0,0 +1,16 @@
+#include "p10.h"
+
+#include <math.h>
+
+void calculate_magnitudes(double (*vectors)[8], int num_vectors, double* out_magnitudes) {
+	for (int i = 0; i < num_vectors; ++i) {
+		double sum_squares = 0.0;
+
+		for (int n = 0; n < 8; ++n) {
+			sum_squares += pow(vectors[i][n], 2);
+		}
+
+		out_magnitudes[i] = sqrt(sum_squares);
+	}
+}
+