C++

Anyone feel like doing some C++ programs for me???
Itll be fun!
And you will be loved forever!

Consider two vectors A and B specified in rectangular coordinates that have their tails fixed at the origin (x, y, z) = (0, 0, 0). The cosine of the included angle  between the vectors is given by

    cos y = (A  B) / (|A| |B| )

where the “dot product” is defined as

A . B = xA xB + yA yB + zA zB

and the magnitudes of the vectors are defined as

    |A| = sqrt (xA2 + yA2 + zA2)

    |B| = sqrt (xB2 + yB2 + zB2)


Knowing the rectangular components of the vectors, we can use the above formulas to compute cos y and from it the included angle y.


For this project, write a C program that prompts the user for the two vectors and calculates the angle between them. This program should employ user-defined functions to improve its structure and readability. Specifically, the program should do the following:

1.    Prompt the user for the coordinates of the first vector one at a time.

2.    Prompt the user for the coordinates of the second vector one at a time.

3.    Calculate the angle y in degrees; define and use a function gamma for this purpose. Gamma in turn should call a function dot_prod that calculates the dot product of two vectors and a function vector_mag that calculates the magnitude of a vector.

4.    Print the value of y to the screen.

5.    Prompt the user to enter ‘c’ to continue with another pair of vectors or ‘q’ to quit.

The ? mark is the dot

Do your own fucking homework.

The ? mark is the dot multiplication

hey i dont know what the hell to do, since i missed class, i was just thinking someone would be nice and take 5 mins of their time.

>>5
that's your own fault, dumbass. Take some fucking responsibility and stop trying to leech off of other people, faggot

whatever man, chill down why are you fighting with me over this, im not trying to leech i just thought someone would be nice to do this for me, I have 5 problems to do this week, and this is just one of them, and If I can figure out how this one works, I can work it into the other ones and figure out how to write those ones also.

I am taking responsibility because I am trying to learn by example.

Wow, your programming course sucks ass if they asks you questions like this.

They should just tell you the specs for the cosine and vector multiplication and ask you "Given two vectors, calculate the angle in degrees." They shouldn't care if you use C, C++ or some peudocode language, as long as you can explain your solution.

By the 1. 2. 3. 4. 5. approach they even practically spelled out the solution for you. Pathetic.

>>1
Why are you taking a programming class?

0) to learn stuff -> then do your own fucking homework, otherwise what is the point?
1) to get a diploma with minimal effort, so I can land a cushy ENTERPRISE LEVEL job -> then why the fuck do you expect /prog/ to sympathise?

tl;dr GTFO

Anyone feel like doing some C++ programs for me???
Itll be fun!

sure I just solved it, it was pretty fun.

and no, I won't be posting the answer. do your own fucking homework.

>>9


Takin the class because I have to because im a elementry education major who will never use programming ever again, but needs to take a level 200 or above class...

no cushy job, just lame i have to get through it.

>>9


Takin the class because I have to because im a elementry education major who will never use programming ever again, but needs to take a level 200 or above class...

no cushy job, just lame i have to get through it.

>>12

hay /prog/, your favourite pastime is lame. do my homework for me!

Your social skills are astounding.

>>13


Perhaps you may learn to read better. I did not say C is lame. It's lame that I have to take it. I find it interesting and fun, but it is no longer fun that once I miss a class I can not do all of my homework. It is lame that I was forced to take it yes, but I have an appreciation of it.

It is lame that I was forced to take it yes

I find it hard to believe a programming class is the only 200-level or above class available at your school.

>>14
Perhaps you may learn to read better.

Perhaps you may learn to express yourself better.

I find it interesting and fun, but it is no longer fun that once I miss a class I can not do all of my homework.

SOLUTION: do not miss class.

Since this won't help you now: ask a fellow student for help. Maybe you'll learn something by solving the problem together. Seriously, you won't be able to get /prog/ to do the exam for you anyway.

It is lame that I was forced to take it yes, but I have an appreciation of it.

Talk is cheap. Prove it by solving this problem.

Post your solution and we will... well we'll probably mock it, but we'll also give you advice.

Step1: Read the fucking assignment... It is C not C++... There is a shipload of difference. If ever your professor / teacher mixes that tell they suck and should not teach programming.

(Step2 If I am in a good mood later)

Step2: Develop the appropriate types.

typedef struct
{
    float x;
    float y;
    float z;
} Vector;

Any ideas for the rest?

OP here im almsot done but i need help on the last part were i need to convert the cos into degrees take a look and any help is appreciated.


/* This program compute the cos of y and the angle y of 2 given vectors*/

#include <stdio.h>
#include <math.h>

int main(void)
{
    /*Declare Variables and functions*/
    double x1,x2,y1,y2,z1,z2;
    double gamma (double vector_mag_A, double vector_mag_B, double dot_prod, double angle_cos, double degrees_Y);
   
    /*Ask user for vector A*/
    printf("Please input the first vector A:   \n \n");
    printf("Vector A X:    \n")
    scanf(" %lf", &x1);
    printf("Vector A Y:    \n")
    scanf(" %lf", &y1);
    printf("Vector A Z:    \n")
    scanf(" %lf", &z1);
   
   
     /*Ask user for vector B*/
    printf("Please input the second vector B:   \n \n");
    printf("Vector B X:    \n")
    scanf(" %lf", &x2);
    printf("Vector B Y:    \n")
    scanf(" %lf", &y2);
    printf("Vector B Z:    \n")
    scanf(" %lf", &z2);
   
    /*Print the value of angle Y*/
    printf(" The Value for degrees is - %10.3lf \n", gamma(degrees_Y));
   
    /*Exit Program*/
    return 0;
}

/*---------------------------------------------------------*/
  /*This function converts the vectors in order to make gamma into degrees*/

double gamma (double vector_mag_A, double vector_mag_B, double dot_prod, double angle_cos, double degrees_Y

{
       /*Declare Varibles*/
       double vector_mag_A, vector_mag_B, dot_prod, angle_cos, degrees_Y;
      
       /*dot product*/
       dot_prod= x1*x2 + y1*y2 + z1*z2;
      
       /*Vector magnitudes*/
       vector_mag_A= sqrt(x1*x1 + y1*y1 + z1*z1)
       vector_mag_B= sqrt(x2*x2 + y2*y2 + z2*z2)
      
       /*compute  degrees of Y*/
       angle_cos= [(dot_prod) / (vector_mag_A * vector_mag_B)]
       degrees_Y= ?
      

Just make it output "NIGGERS!"

http://www.google.com/search?q=rad+to+deg

printf("NIGGGERRS!")

>>22


I know how to do that but is the way that I did it, does that show it in radions or do i need to somehow take the inverse of what I get?

>>23
while true; printf( "NAGGERS\n" );

cos(y) = (u . v) <-> y = acos(u . v)

God you suck in math. Hope you write business applications...

Why the hell would you use C++? You gonna uses OO PROGRAMMING for this??? hell you could program this in BASIC

>>26


I dont write applications thats the problem lol... I just do them for school and these are the problems that I get.

>>26


I dont write applications thats the problem lol... I just do them for school and these are the problems that I get.

>>29

And I write applications for a living and if they crash your local nuclear plant or oil refinery will burn down. I am not joking...

>>20
stop using
faggot
{
 braces
}

okay here it is, i think this might work but i have no way to test it..... and i have to use braces my teacher makes us do it exactly like the book says..


/* This program compute the cos of y and the angle y of 2 given vectors*/

#include <stdio.h>
#include <math.h>


int main(void)
{
    /*Declare Variables and functions*/
   
    double x1,x2,y1,y2,z1,z2;
    double gamma (double vector_mag_A, double vector_mag_B, double dot_prod, double angle_cos, double degrees_Y);
    char c, z;

do
{
    /*Ask user for vector A*/
   
    printf("Please input the first vector A:   \n \n");
    printf("Vector A X:    \n");
    scanf(" %lf", &x1);
    printf("Vector A Y:    \n");
    scanf(" %lf", &y1);
    printf("Vector A Z:    \n");
    scanf(" %lf", &z1);
  
  
     /*Ask user for vector B*/

    printf("Please input the second vector B:   \n \n");
    printf("Vector B X:    \n");
    scanf(" %lf", &x2);
    printf("Vector B Y:    \n");
    scanf(" %lf", &y2);
    printf("Vector B Z:    \n");
    scanf(" %lf", &z2);
  
    /*Print the value of angle Y*/

    printf(" The Value for degrees is - %10.3lf \n \n \n", gamma(degrees_Y));

    /*Ask If they would like to continue*/
   
    printf(" Would you like to continue with another set of Vectors type 'c':   \n");
    z=getchar()

}while (z=='c')
   
  
    /*Exit Program*/

    return 0;
}

/*---------------------------------------------------------*/
  /*This function converts the vectors in order to make gamma into degrees*/

double gamma (double vector_mag_A, double vector_mag_B, double dot_prod, double angle_cos, double degrees_Y)

{
       /*Declare Varibles*/

       double vector_mag_A, vector_mag_B, dot_prod, angle_cos, degrees_Y;
     
       /*dot product*/

       dot_prod= x1*x2 + y1*y2 + z1*z2;
     
       /*Vector magnitudes*/

       vector_mag_A= sqrt(x1*x1 + y1*y1 + z1*z1);
       vector_mag_B= sqrt(x2*x2 + y2*y2 + z2*z2);
     
       /*compute  degrees of Y*/

       angle_cos= acos[(dot_prod) / (vector_mag_A*vector_mag_B)];
       degrees_Y= (angle_cos* (180/3.14159));
}

NO WAY TO TEST IT?! WTF?! Use a fucking compiler...

sean@mars:~/Devel/misc$ gcc vector.c
vector.c: In function ‘main’:
vector.c:12: error: conflicting types for ‘gamma’
vector.c:40: error: ‘degrees_Y’ undeclared (first use in this function)
vector.c:40: error: (Each undeclared identifier is reported only once
vector.c:40: error: for each function it appears in.)
vector.c:40: error: too few arguments to function ‘gamma’
vector.c:47: error: expected ‘;’ before ‘}’ token
vector.c:52: error: expected ‘;’ before ‘return’
vector.c: In function ‘gamma’:
vector.c:63: error: ‘vector_mag_A’ redeclared as different kind of symbol
vector.c:58: error: previous definition of ‘vector_mag_A’ was here
vector.c:63: error: ‘vector_mag_B’ redeclared as different kind of symbol
vector.c:58: error: previous definition of ‘vector_mag_B’ was here
vector.c:63: error: ‘dot_prod’ redeclared as different kind of symbol
vector.c:58: error: previous definition of ‘dot_prod’ was here
vector.c:63: error: ‘angle_cos’ redeclared as different kind of symbol
vector.c:58: error: previous definition of ‘angle_cos’ was here
vector.c:63: error: ‘degrees_Y’ redeclared as different kind of symbol
vector.c:58: error: previous definition of ‘degrees_Y’ was here
vector.c:67: error: ‘x1’ undeclared (first use in this function)
vector.c:67: error: ‘x2’ undeclared (first use in this function)
vector.c:67: error: ‘y2’ undeclared (first use in this function)
vector.c:67: error: ‘z1’ undeclared (first use in this function)
vector.c:67: error: ‘z2’ undeclared (first use in this function)
vector.c:71: error: invalid operands to binary *
vector.c:76: error: subscripted value is neither array nor pointer

>> 31

stop criticizing l33t braces...

and i have to use braces my teacher makes us do it exactly like the book says..

Tell your teacher to burn in hell.

>>33


wow im fucked....

>>34
Fuck the Allman indentation style. Either use K&R (faggy) or BSD KNF.

>> 37

WTF is Allman? Google Allmann and you find a guitar player... No wonder he has a crappy indentation...

No really using -bl is way cleaner to read.

STATEMENTS
     The `-br' or `-bl' option specifies how  to  format  braces.
     The `-br' option formats braces like this:

               if (x > 0) {
                 x--;
               }

     The `-bl' option formats them like this:

               if (x > 0)
                 {
                   x--;
                 }

     If you use the `-bl' option, you may also  want  to  specify
     the  `-bli'  option.   This  option  specifies the number of
     spaces by which braces are indented.  `-bli2', the  default,
     gives  the  result shown above.  `-bli0' results in the fol-
     lowing:

               if (x > 0)
               {
                 x--;
               }

     If you are using the `-br' option, you probably want to also
     use  the  `-ce'  option.   This  causes the `else' in an if-
     then-else construct to cuddle up to the immediately  preced-
     ing `}'.  For example, with `-br -ce' you get the following:

               if (x > 0) {
                 x--;
               } else {
                 fprintf (stderr, "...something wrong?0);
               }

     With `-br -nce' that code would appear as

               if (x > 0) {
                 x--;
               }
               else {
                 fprintf (stderr, "...something wrong?0);
               }

     The `-cli' option specifies the number of spaces  that  case
     labels  should  be  indented  to the right of the containing
     `switch' statement.

     If a semicolon is on the same line as  a  `for'  or  `while'
     statement,  the `-ss' option will cause a space to be placed
     before the semicolon. This emphasizes the semicolon,  making
     it  clear that the body of the `for' or `while' statement is
     an empty statement. `-nss' disables this feature.

     The `-pcs' option causes a space to be  placed  between  the
     name of the procedure being called and the `(' (for example,
     `puts   ("Hi");'.   The   `-npcs'    option    would    give
     `puts("Hi");').

     If the `-cs' option is  specified,  `indent'  puts  a  space
     after a cast operator.

     The `-bs' option ensures that there is a space  between  the
     keyword  `sizeof'  and its argument.  In some versions, this
     is known as the `Bill_Shannon' option.

-bl -bli0 It the way to go

>>36
Meh, it's not so bad. I'm not too familiar with C, but it seems you just messed up a few declarations, forgot a couple of semicolons and forgot to pass some parameters to a function. These things happen all the time, that's what compiler error messages are for.

Get a C compiler, I'm sure there are plenty of free ones out there if you Google 'em. That will also allow you to test your program once you get out these kinks, giving you a warm fuzzy feeling when the test succeeds.

I'm sure there are plenty of free ones
GCC is all you'll ever need.

provide reward, receive program

Why are you learning programming with C? Use a better language to learn programming. I suggest one of:
- Python, the Abelson's choice for a flexible learning language
- Scheme, the Sussman's legendary language
- Logo, the Abelson's attractive and suave learner's language

This post is free text: you can copypasta it and/or modify it under the terms of the GNU Trolling Public License as published by the Free Software Foundation.

This post is made in the hope that it will be fun, but WITHOUT ANY WARRANTY; without even the implied warranty of SUCCESS or ON TOPIC FOR A PARTICULAR THREAD. See the GNU Troll Public License for more details.

You should have received a copy of the GNU Trolling Public License along with this post. If not, see <http://www.gnu.org/yhbt/>;.

this is why we have python:

from math import acos
v1=input('vector1\n')
v2=input('vector2\n')
dot=reduce(lambda x,y:x+y,map(lambda x,y:x*y,v1,v2))
abs1=reduce(lambda x,y:x+y,map(lambda x:x**2,v1))**0.5
abs2=reduce(lambda x,y:x+y,map(lambda x:x**2,v2))**0.5

print (acos(dot/(abs1*abs2)))

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Expert programming site.

And you will be loved forever!
And you will be forgotten immediatly

>>45
ONE WORD, FORCED INDENTAITON FO THE CODE, THREAD OVER!!!!!!!!!!!!!!!!!!!!!!!

>>48
ONE WORD ,7 LINES, LOT LESS THAN C++

OP is fail for not be able to do it on his own

cout <<"this thread sucks";

The scene is an   awesome bandaid but.

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