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Lab5/angle.c

+
+
+#include <stdio.h>
+#include <math.h>
+
+int main()
+{
+	int matrix[4][3]={{1,4,6},
+					  {2,-3,1},
+					  {3,5,0},
+					  {3,1,-3}};
+	double length1;
+	double length2;
+	int dotProduct;
+	double angle;
+	double cosAngle;
+	int i;
+	int j;
+	int m;
+	int k;
+	i=0;
+	for(i=0;i<4;i++){
+		m=i+1;
+		while(m<4){
+			printf("The first  vector is:\n");
+				for(j = 0; j < 3; j++){		
+					printf("%d ", matrix[i][j]);
+				}
+			printf("\n");
+			printf("The second vector is:\n");
+				for(k = 0; k < 3; k++){		
+					printf("%d ", matrix[m][k]);
+				}	
+			printf("\n");
+			
+			
+			
+			length1 = sqrt(matrix[i][0]*matrix[i][0]+matrix[i][1]*matrix[i][1]+matrix[i][2]*matrix[i][2]);
+			length2 = sqrt(matrix[m][0]*matrix[m][0]+matrix[m][1]*matrix[m][1]+matrix[m][2]*matrix[m][2]);
+			printf("length1 1 %f\n", length1);
+			printf("length1 2 %f\n", length2);
+			dotProduct=0;
+			for (j=0;j<3;j++){
+				dotProduct = dotProduct + matrix[i][j]*matrix[m][j];
+				}
+			cosAngle=dotProduct/(length1*length2);
+			angle=acos(cosAngle);
+		printf("angle %f \n", angle);
+		printf("\n");		
+		printf("\n");
+		m++;
+				}
+		}
+		
+		
+	
+	
+	return 0;
+}
+