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lab6/1.c

+#include <stdio.h>
+#include <math.h>
+int dotProduct(int vector1[3], int vector2[3]);
+double vectorMagnitude(int vector[3]);
+double cosComapare(int vector1[3], int vector2[3]);
+int main()
+{
+	int matrix[4][3]={{1,4,6},
+					  {2,-3,1},
+					  {3,5,0},
+					  {3,1,-3}};
+	int i;
+	int m;
+	double value;
+
+
+	for(i=0;i<4;i++){
+		m=i+1;
+		while(m<4){
+			value = acos(cosComapare(matrix[i], matrix[m]));
+			printf(" the anlge in radians %lf\n", value);
+			m++;
+			}
+	}
+
+	return 0;
+}
+
+double vectorMagnitude(int vector[3]){
+	int sumOfSquares = 0;
+	int i;
+	for(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;
+	int i=0;
+	for(i = 0; i < 3; i++){
+			dot +=vector1[i] + vector2[i];
+	}
+	return dot;
+}
+
+double cosComapare(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;
+	
+}
+