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LAB6/task1.c

+#include <stdio.h>
+#include <math.h>
+
+double vectorMagnitude(int vector[3]);
+int dotProduct (int vector1[3], int vector2[3]);
+double cosCompare(int vector1[3], int vector2[3]);
+int main(){
+	int matrix[4][3] = {{1, 4, 6},
+						{2, -3, 1},
+						{3, 5,  0},
+						{3, 1, -3}};
+						
+	for(int i = 0; i < 3; i++){	
+		for(int j = i + 1; j < 4; j++){
+			printf("%lf\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);
+	double anglerad = acos(cosine);
+	double angle = anglerad * 180.0 / 3.1415926535897932384626433832795028841 ;
+	return angle;
+}