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Lab5PracticeTask2.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}
+	}; 
+	int j;
+	int n;
+	int q;
+	int p;
+	int dot;
+	int lenSq1;
+	int lenSq2;
+	double angle;
+	printf("vector1   vector2  angle in degree\n");
+	for(j = 0; j < 4; j = j+2){	
+		for(n = 0; n < 4; n++){	
+			if(n != j ){
+				int x1 = matrix[j][0];
+				int y1 = matrix[j][1];
+				int z1 = matrix[j][2];
+				int x2 = matrix[n][0];
+				int y2 = matrix[n][1];
+				int z2 = matrix[n][2];
+				dot = x1 * x2 + y1 * y2 + z1 * z2;   
+				lenSq1 = x1 * x1 + y1 * y1 + z1 * z1;
+				lenSq2 = x2 * x2 + y2 * y2 + z2 * z2;
+				angle = acos(dot / sqrt(lenSq1 * lenSq2));
+					
+				angle = angle * (180.0 / 3.14159265);
+					
+					
+				for(q = 0; q < 3; q++){
+					printf("%d ", matrix[j][q]);
+				}	
+				printf("    ");
+				for(p = 0; p < 3; p++){
+					printf("%d ", matrix[n][p]);
+				}	
+				printf("    ");
+				printf("%f\n", angle);
+					
+			}	
+		}	
+	}	
+	
+	return 0;
+}