Antoun J. Yaacoub Ph.D.

Write a program that calculates the scalar product of two integer vectors U and V (of the same dimension).

\((3\ \ 2\ -4) \times (2\ -3\ \ 5) = 3 \times 2 + 2\times(-3) + (-4)\times 5 = -20 \)

Difficulty level

Video recording

This exercise is mostly suitable for students

#include<stdio.h>
#include<math.h>
#include<conio.h>
#define SIZE 10
void main()
{
	int A1[SIZE], A2[SIZE];
	int dim; // same dimension for both vectors
	int i, j;
	int sum = 0;

	do {
		printf("Enter the dimension: ");
		scanf("%d", &dim);
	} while (dim <= 0 || dim > SIZE);

	printf("**Reading first vector**\n");
	for (i = 0; i<dim; i++)
	{
		printf("Enter A1[%d]=", i);
		scanf("%d", &A1[i]);
	}

	printf("**Reading second vector**\n");
	for (i = 0; i<dim; i++)
	{
		printf("Enter A2[%d]=", i);
		scanf("%d", &A2[i]);
	}

	printf("\n\n(");
	for (i = 0; i<dim; i++)
	{
		printf("%d ", A1[i]);
	}
	printf(")*(");

	for (i = 0; i<dim; i++)
	{
		printf("%d ", A2[i]);
	}
	printf(")=");

	for (i = 0; i < dim; i++)
		sum += A1[i] * A2[i];

	printf("%d\n", sum);

	getch();
}

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