C++ Programming arrays, dot matrix Assume the following 2 arrays A[3]=[1,2,3} B[

Question

C++ Programming arrays, dot matrix

Assume the following 2 arrays

A[3]=[1,2,3}

B[3]={4,5,6}

Dot product of array A and B is

a[0] *b[0} + a[1]*b[1] + a[2]*b[2]

in this case, 1*4 + 2*5 + 3*16 = 30

The program will have one function

dot   - The function requires 2 integer arrays and an integer for size of the array

            It will return an integer

Declare and initialize a constant integer SIZE = 4

Declare and initialize 2 arrays in the main.

int A[SIZE]={1,2,3,4};  

int B[SIZE]={5,6,7,8};

Call the function dot and show the following output in main - DO NOT HARDCODE THE OUTPUT. SIZE AND ELEMENTS SHOULD BE ABLE TO BE CHANGED

What it should look like:

C++ Programming arrays, dot matrix Assume the following 2 arrays A[3]=[1,2,3} B[3]={4,5,6} Dot product of array A and B is a[0] *b[0} + a[1]*b[1] + a[2]*b[2] in this case, 1*4 + 2*5 + 3*16 = 30 The program will have one function dot - The function requires 2 integer arrays and an integer for size of the array It will return an integer Declare and initialize a constant integer SIZE = 4 Declare and initialize 2 arrays in the main. int A[SIZE]={1,2,3,4}; int B[SIZE]={5,6,7,8}; Call the function dot and show the following output in main - DO NOT HARDCODE THE OUTPUT. SIZE AND ELEMENTS SHOULD BE ABLE TO BE CHANGED What it should look like:

Explanation / Answer

#include <iostream>

using namespace std;

int dot(int A[], int B[], int size){
   int sum = 0;
   for(int i = 0; i < size; ++i){
       sum += A[i] * B[i];
   }
   return sum;
}

void print(int arr[], int size){
   cout << "{";
   for(int i = 0; i < size; ++i){
       cout << arr[i] << " ";
   }
   cout << "}";
}

int main(){
   const int SIZE = 4;
   int A[SIZE] = {1,2,3,4};
   int B[SIZE] = {5,6,7,8};
   cout << "The dot product of ";
   print(A, SIZE);
   cout << " ";
   print(B, SIZE);
   cout << " is " << dot(A, B, SIZE) << endl;
   return 0;
}

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