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lab6task1.c

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