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Lab6/Task1.c

+#include <stdio.h>
+#include <math.h>
+
+double vectorMagnitude(int vector[3]);
+int dotProduct(int vector[3], int vector2[3]);
+double cosCompare(int vector1[3], int vector2[3]);
+
+int main()
+{
+    int i, j;
+    int matrix[4][3] = {
+        {1, 4, 6},
+        {2, -3, 1},
+        {3, 5, 0},
+        {3, 1, -3}};
+
+    for (i = 0; i < 3; i++)
+    {
+        for (j = 1 + i; j < 4; j++)
+        {
+            printf("%.3f,\n", cosCompare(matrix[i], matrix[j]));
+        }
+    }
+
+    return 0;
+}
+
+double vectorMagnitude(int vector[3])
+{
+    int sumOfSquares = 0;
+    for (int i = 0; i < 3; i++)
+    {
+        sumOfSquares += vector[i] * vector[i];
+    }
+    double magnitude = sqrt(sumOfSquares);
+    return magnitude;
+}
+
+int dotProduct(int vector1[3], int vector2[3])
+{
+    int dot = 0;
+    for (int i = 0; i < 3; i++)
+    {
+        dot += vector1[i] * vector2[i];
+    }
+    return dot;
+}
+
+double cosCompare(int vector1[3], int vector2[3])
+{
+    int dot = dotProduct(vector1, vector2);
+
+    double mag1 = vectorMagnitude(vector1);
+    double mag2 = vectorMagnitude(vector2);
+
+    double cosine = dot / (mag1 * mag2);
+    cosine = acos(cosine);
+    return cosine;
+}