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Lab6Classwork.c

+#include <stdio.h>
+#include <math.h>
+int dotProduct(int vector1[3], int vector2[3]);
+double vectorMagnitude(int vector[3]);
+double cosCompare(int vector1[3], int vector2[3]);
+double angleInDegree(double cosine);
+int main(){
+	int matrix[4][3] ={
+					  {1, 4, 6},
+					  {2, -3, 1},
+					  {3, 5, 0},
+		              {3, 1, -3}};
+		              
+	printf("vector1   vector2  angle in degree\n");	
+	for(int i = 0; i < 4; i = i + 2){	
+		for(int j = 0; j < 4; j++){	
+			if(j != i){
+				for(int q = 0; q < 3; q++){
+					printf("%d ", matrix[i][q]);
+				}	
+				printf("    ");
+				for(int p = 0; p < 3; p++){
+					printf("%d ", matrix[j][p]);
+				}	
+				printf("    ");
+				printf("%lf\n", angleInDegree(cosCompare(matrix[i], matrix[j])));
+			}
+		}
+	}
+	
+	return 0;
+}	
+
+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 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;	
+}
+
+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);
+	return cosine;
+}
+
+double angleInDegree(double cosine){
+	double angle;
+	angle = acos(cosine);
+	angle = angle * (180.0 / 3.14159265);
+	
+	return angle;
+}	
+
+