Comments on: 4.7 — Structs

By: Structs « Learn C++ Programming

Structs « Learn C++ Programming — Fri, 13 Jan 2012 09:40:01 +0000

[...] 1) Hide Solution [...]

By: ayahsabbah

ayahsabbah — Sat, 12 Nov 2011 23:18:25 +0000

Hi, I have to write code to do the following task:
–define a simple structs to store common information. In particular, write definitions for a struct called Point to store the X, Y and Z coordinates of a point.
I have this:
struct Point{
double xcoord;
double y coord;
};
Then Having defined a struct in the previous section, I need to write two simple functions to use this struct. First, write a function to prompt the user to enter the coordinates of a point, read the coordinates from the keyboard and store them a struct of type Point. The function prototype is as follows
Point ReadPoint();
Second, write a function to determine the Cartesian distance between two points. The function prototype is as follows
double DistanceBetweenPoints( const Point& pt1, const Point& pt2 );

I have:
Point ReadPoint(){
double x;
double y;
cout<<"enter the x and y coordinate of the point: "<>x>>y;
}
and
double DistanceBetweenPoints( const Point& pt1, const Point& pt2 ){
double distance;
distance= sqrt (pow((x1-x2),2)+pow((y1-y2),2));//i dont know what variables I should add in here
return double;
}
..Please help and respond ASAP because I need to have this assignment done soon..thanks!

By: ranjbar

ranjbar — Sat, 12 Nov 2011 00:35:35 +0000

hi
in quiz 2 i wrote the program :

#include

struct Fraction
{
float x;
float y;
float frac;

};

void Multiply(Fraction f1, Fraction f2)
{
using namespace std;

// Don’t forget the static cast, otherwise the compiler will do integer division!
cout << f1.frac*f2.frac ;
}
int main()
{
using namespace std;

// Allocate our first fraction
Fraction f1;
cout <> f1.x;
cout <> f1.y;

// Allocate our second fraction
Fraction f2;
cout <> f2.x;
cout <> f2.y;
f1.frac = f1.x/f1.y;
f2.frac =f2.x/f1.y;
Multiply(f1,f2);

return 0;
}

but my program has less accuracy than yours.
is this has a relation to this fact that i declare my variables first in float but u declare them first in int and then convert them to float?

By: Eddyboy18

Eddyboy18 — Thu, 11 Aug 2011 17:24:48 +0000

@Jman try this
first ur struct is an integer,and the function double, does that make sense?
Try something like this:
struct fraction
{
int nNumerator;
int nDenominator;
};
void input(fraction obj,int nNum,int nDenom)
{
obj.nNumerator=nNum;
obj.nDenominator=nDenom;
cout<<"the numerator "< cout<<"the denominator"< }
int main()
{
fraction objm;
int nNum1,nDenom1;
cout<<"enter the numerator"<>nNum1;
cout<<"enter the denominator"<>nDenom1;
//call to the function
input(objm,nNum1,nDenom1);
return 0;
}

By: lynx1241

lynx1241 — Sun, 03 Jul 2011 19:14:11 +0000

html screwed my last comment :/

By: lynx1241

lynx1241 — Sun, 03 Jul 2011 19:10:14 +0000

Because you need to choose a type to cast, e.g. static_cast(expression) instead of static_cast(expression).

By: JMan

JMan — Fri, 22 Apr 2011 10:50:49 +0000

why my code always produce interger output?Can anyone please help me?:(

// Enumeraor.cpp : Defines the entry point for the console application.
//

#include “stdafx.h”
#include

struct Fraction
{
int nNumerator;
int nDenomintor;
};

double Input()
{
using namespace std;
Fraction sFrac;
cout<<"Enter the numerator of fraction :"<>sFrac.nNumerator;
cout<<"Enter the denominator of fraction :"<>sFrac.nDenomintor;
return static_cast(sFrac.nNumerator/sFrac.nDenomintor);
}

int main()
{
using namespace std;
double dFracA=Input();
double dFracB=Input();
double dResult;
static_cast(dResult=dFracA*dFracB);
cout<<"The result is :"< return 0;
}

By: Groovychicken

Groovychicken — Sat, 05 Mar 2011 14:21:58 +0000

cout << "Wage: " << sEmployee.fWage << endl << endl;

is there a reason for 2 endl's? or is it just a typo :)

By: sm00th_0perat0r

sm00th_0perat0r — Wed, 02 Mar 2011 02:51:41 +0000

I'll bet one could be created!! C++ rocks!!!

By: anas.s

anas.s — Tue, 25 Jan 2011 06:31:45 +0000

Alex,

You’ve shown that we can pass struct to functions, but here is a question :

Can a function return result of type struct?