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#include <iostream>
#include <iomanip>
#include <cmath>
 
using namespace std;
 
const double EPSILON(1e-12);
 
// function prototypes
 
// ENTER FUNCTION PROTOTYPE FOR read_vector HERE.
void read_vector(const double & prompt, double & x, double & y);
 
// ENTER FUNCTION PROTOTYPE FOR vector_length HERE.
double vector_length (double x, double y);
 
// ENTER FUNCTION PROTOTYPE FOR write_vector HERE.
void write_vector(const double & prompt, double & x, double & y);
 
// ENTER FUNCTION PROTOTYPE FOR vector_add HERE.
void vector_add (double & x1, double & y1, double & x2, double & y2, double & x3, double & y3);
 
// ENTER FUNCTION PROTOTYPE FOR vector_subtract HERE.
void vector_subtract (double & x1, double & y1, double & x2, double & y2, double & x3, double & y3);
 
// ENTER FUNCTION PROTOTYPE FOR scalar_mult HERE.
void scalar_mult (double & x1, double & y1, double & s, double & x2, double & y2);
 
// ENTER FUNCTION PROTOTYPE FOR normalize HERE.
void normalize (double & x, double & y);
 
// ENTER FUNCTION PROTOTYPE FOR perpendicular HERE.
void perpendicular (double & x1, double & y1, double & x2, double & y2);
 
// *** DO NOT CHANGE ANY CODE IN THE MAIN FUNCTION.
int main()
{
    double u1, v1;	// coordinates of first vector
    double u2, v2;	// coordinates of second vector
    double u3, v3;
    double scalar;
 
    read_vector("Enter first vector (2 floats): ", u1, v1);
    read_vector("Enter second vector (2 floats): ", u2, v2);
 
    cout << "Enter scalar multiplier: ";
    cin >> scalar;
    cout << endl;
 
    write_vector("First vector: ", u1, v1);
    write_vector("Second vector: ", u2, v2);
 
    cout << endl;
 
    vector_add(u1, v1, u2, v2, u3, v3);
    write_vector("Vector add: ", u3, v3);
 
    vector_subtract(u1, v1, u2, v2, u3, v3);
    write_vector("Vector subtract: ", u3, v3);
 
    scalar_mult(u1, v1, scalar, u3, v3);
    write_vector("Scalar multiplier: ", u3, v3);
 
    cout << endl;
 
    write_vector("First vector: ", u1, v1);
    write_vector("Second vector: ", u2, v2);
    perpendicular(u1, v1, u2, v2);
 
    return(0);
}
 
// DEFINE FUNCTION read_vector HERE.
 
void read_vector(const double & prompt, double & x, double & y)
{
 
    cout << prompt;
    cin >> x >> y;
}
 
// DEFINE FUNCTION vector_length HERE.
 
double vector_length (double x, double y)
{
    double v_length = sqrt(pow(x, 2) + pow(y, 2));
    return (v_length);
}
 
 
// DEFINE FUNCTION write_vector HERE.
 
void write_vector(const double & prompt, double & x, double & y)
{
    cout << "(" << x << ", " << y << ") has length" << vector_length(x,y) << endl;
}
 
 
// DEFINE FUNCTION vector_add HERE.
 
void vector_add (double & x1, double & y1, double & x2, double & y2, double & x3, double & y3)
{
    x3 = x1 + x2;
    y3 = y1 + y2;
}
 
// DEFINE FUNCTION vector_subtract HERE.
 
void vector_subtract (double & x1, double & y1, double & x2, double & y2, double & x3, double & y3)
{
    x3 = x1 - x2;
    y3 = y1 - y2;
}
 
// DEFINE FUNCTION scalar_mult HERE.
 
void scalar_mult (double & x1, double & y1, double & s, double & x2, double & y2)
{
    x2 = s * x1;
    y2 = s * y1;
}
 
// DEFINE FUNCTION normalize HERE.
void normalize (double & x, double & y)
{
 
}
 
// DEFINE FUNCTION perpendicular HERE.
 
void perpendicular (double & x1, double & y1, double & x2, double & y2)
{
 
}

prog.cpp: In function ‘int main()’:
prog.cpp:43:58: error: invalid initialization of reference of type ‘const double&’ from expression of type ‘const char*’
     read_vector("Enter first vector (2 floats): ", u1, v1);
                                                          ^
prog.cpp:12:6: error: in passing argument 1 of ‘void read_vector(const double&, double&, double&)’
 void read_vector(const double & prompt, double & x, double & y);
      ^
prog.cpp:44:59: error: invalid initialization of reference of type ‘const double&’ from expression of type ‘const char*’
     read_vector("Enter second vector (2 floats): ", u2, v2);
                                                           ^
prog.cpp:12:6: error: in passing argument 1 of ‘void read_vector(const double&, double&, double&)’
 void read_vector(const double & prompt, double & x, double & y);
      ^
prog.cpp:50:42: error: invalid initialization of reference of type ‘const double&’ from expression of type ‘const char*’
     write_vector("First vector: ", u1, v1);
                                          ^
prog.cpp:18:6: error: in passing argument 1 of ‘void write_vector(const double&, double&, double&)’
 void write_vector(const double & prompt, double & x, double & y);
      ^
prog.cpp:51:43: error: invalid initialization of reference of type ‘const double&’ from expression of type ‘const char*’
     write_vector("Second vector: ", u2, v2);
                                           ^
prog.cpp:18:6: error: in passing argument 1 of ‘void write_vector(const double&, double&, double&)’
 void write_vector(const double & prompt, double & x, double & y);
      ^
prog.cpp:56:40: error: invalid initialization of reference of type ‘const double&’ from expression of type ‘const char*’
     write_vector("Vector add: ", u3, v3);
                                        ^
prog.cpp:18:6: error: in passing argument 1 of ‘void write_vector(const double&, double&, double&)’
 void write_vector(const double & prompt, double & x, double & y);
      ^
prog.cpp:59:45: error: invalid initialization of reference of type ‘const double&’ from expression of type ‘const char*’
     write_vector("Vector subtract: ", u3, v3);
                                             ^
prog.cpp:18:6: error: in passing argument 1 of ‘void write_vector(const double&, double&, double&)’
 void write_vector(const double & prompt, double & x, double & y);
      ^
prog.cpp:62:47: error: invalid initialization of reference of type ‘const double&’ from expression of type ‘const char*’
     write_vector("Scalar multiplier: ", u3, v3);
                                               ^
prog.cpp:18:6: error: in passing argument 1 of ‘void write_vector(const double&, double&, double&)’
 void write_vector(const double & prompt, double & x, double & y);
      ^
prog.cpp:66:42: error: invalid initialization of reference of type ‘const double&’ from expression of type ‘const char*’
     write_vector("First vector: ", u1, v1);
                                          ^
prog.cpp:18:6: error: in passing argument 1 of ‘void write_vector(const double&, double&, double&)’
 void write_vector(const double & prompt, double & x, double & y);
      ^
prog.cpp:67:43: error: invalid initialization of reference of type ‘const double&’ from expression of type ‘const char*’
     write_vector("Second vector: ", u2, v2);
                                           ^
prog.cpp:18:6: error: in passing argument 1 of ‘void write_vector(const double&, double&, double&)’
 void write_vector(const double & prompt, double & x, double & y);
      ^

Standard output is empty