c++

use pointers to return values to the calling function, 1.e. using the following functions: void dot product (double vi[], double v2[], double *dot_product); void vector_angle (double vil], double v2[], double dot_product, double *angle); The input data must come from the external file "input.txt" given together with this lab sheet, and the output must be printed to an external file. There are more than one set of datum in input.txt". Your program should read in all datum and stop upon detecting the end-of- file marker. The program should not be interactive. A sample output of this program looks like the following: The first vector vi: 1.0000 2.0000 3.0000 The second vector V2: 4.0000 5.0000 6.0000 The dot product of vi and V2 is 32.0000. The angle between vi and V2 is 0.2257 rads. The first vector vi: 1.0000 2.0000 3.0000 The second vector v2: 3.0000 3.0000 1.0000 The dot product of vi and V2 is 12.0000. The angle between vi and V2 is 0.7440 rads