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Lab6/lab6_1.c

+#include <stdio.h>
+#include <math.h>
+#include <stdlib.h>
+
+float angle(int a[], int b[]);
+
+int main() {
+	int matrix[4][3]={{1,4,6},
+						{2,-3,1},
+						{3,5,0},
+						{3,1,-3}};
+						
+	int start=1;
+	for(int i=0; i<4;i++)
+	 {
+		for(int j=start;j<4;j++)
+		 {
+			printf("%f\n",angle(matrix[i],matrix[j]));
+		}
+		start++;
+	}
+	
+return 0;
+}
+int dot(int a[], int b[]) 
+{
+	int dot=0;
+	int i;
+	for(i=0; i<3; i++)
+	{
+		dot+=a[i]*b[i];
+	}
+	return dot;
+}
+
+
+float m(int a[]) {
+	return sqrt(pow(a[0],2)+pow(a[1],2)+pow(a[2],2));
+}
+
+float angle(int a[], int b[]) {
+	return acos(dot(a,b)/(m(a)*m(b)))*180/M_PI;
+}