Question

programing C，already write part of code

(a) Write a function print.array that receives an array of real numbers and the number of el stored in the array. This function must display the elements of the array in order with each one on a line by itself in a field width of 7 with two decimal places. (See sample output. Recall the format specifier would be "%7.21f"). (b) Sometimes we want to treat an array as a mathematical vector and compute the dot product of two vectors. The dot product of two vectors is the sum of the product of the corresponding elements. In mathematical notation for arrays named x and y containing n elements, this would be:

Answer 1

#include<stdio.h>
#define SIZE 50

//pre defining the function to be used
void read_numbers(double[],double[]);
void print_array(int,double[],double[]);
double dot_product(int,double[],double[]);

//making length of array (n) global
int n=0;

void main(){
   double sum;
   double array_one[SIZE],array_two[SIZE]

;//calling the three functions one after other
   read_numbers(array_one,array_two);
   print_array(n,array_one,array_two);
   sum = dot_product(n,array_one,array_two);

//printing the return dot product of the function dot_product

   printf("The dot product of these two vectors is: %.2lf\n",sum);
}

//functions to read user entered inputs vectors

void read_numbers(double array_one[],double array_two[]){
   int i=0;
   printf("Enter the number of elements in the array\n");
   scanf("%d",&n);
   printf("Fill the first array\n");
   for(i=0;i<n;i++){
       printf("Enter a number 0 to end input\n");
       scanf("%lf",&array_one[i]);
   }
   printf("Fill the second array\n");
   for(i=0;i<n;i++){
       printf("Enter a number 0 to end input\n");
       scanf("%lf",&array_two[i]);
   }
}

//print the user entered vectors values

void print_array(int n,double array_one[],double array_two[]){
int i=0;
printf("The values of first vector are\n");
for(i=0;i<n;i++){
   printf("%.2f\n",array_one[i]);
}
printf("The values of second vector are\n");
for(i=0;i<n;i++){
   printf("%.2f\n",array_two[i]);
}
}

//produce the dot product of user entered vector values and return the dot product to main function

double dot_product(int n,double array_one[],double array_two[]){
    int i=0;
    double dotsum;
    for(i=0;i<n;i++){
        dotsum+=array_one[i]*array_two[i];
    }
    return dotsum;
}

nter the number of elements in the array ll the tist array nter a number 0 to end input nter a number 0 to end input 4.2 nter a number 0 to end input nter a number 0 to end input ill the second arra!y nter a number to end input nter a number to end input nter a number to end input 2.5 nter a number to end input he values of first vector are 10 4.20 2.00 he values of second vector are 30 2.50 he dot product of these two vectosrs is -49.36