Question

C++

Suppose the vector v = [4 -6 7]. Create three vectors:

1. p, which is twice as long as v and points in the same direction as v
2. q, which has the same length as v and points in the opposite direction of v
3. r, which is three quarters the length of v and points in the same direction as v
Print out the results of each vector calculation.

Answer 1

#include <iostream>
using namespace std;

void printVector(float vector[]) {
for (int i = 0; i < 3; i++)
cout << vector[i] << " ";
cout << endl;
}

void multiplyVector(float vector[], float multiplier) {
float* p = new float[3];
for (int i = 0; i < 3; i++)
p[i] = vector[i] * multiplier;
  
printVector(p);
}

void doubleVector(float vector[]) {
multiplyVector(vector, 2.0f);
}

void reverseVector(float vector[]) {
multiplyVector(vector, -1.0f);
}

void threeQuarterVector(float vector[]) {
multiplyVector(vector, 3.0f/4.0f);
}

int main() {
   //vector v
   float v[3] = {4, -6, 7};
   cout << "Vector v: ";
   printVector(v);
  
   //vector p
   cout << "Vector p: ";
   doubleVector(v);
  
   //vector q
   cout << "Vector q: ";
   reverseVector(v);
  
   //vector r
   cout << "Vector r: ";
   threeQuarterVector(v);
  
   return 0;
}

=======Output========

Vector v: 4 -6 7
Vector p: 8 -12 14
Vector q: -4 6 -7
Vector r: 3 -4.5 5.25