Need help with homework assignment!

[srowe2]

I barely know where to begin! Can someone help me? The most I know is how to set up the program and declare variables!! Anyway, this is the question to number 1...



1. Write a program that reads in the radius of a circle and prints the circle’s diameter, circumference and area. Use the constant value 3.14159 for π
Diameter = 2 x radius
Circumference = π * diameter
Area = π * radius2
Display the values of diameter, circumference and area using precision of 2.




So, This is what I have so, please know that I am an EXTREME beginner, so this may be incorrect;

#include <iostream>
#include <cmath>
using namespace std;

int main()

{
const double pi= 3.14159;
double diameter;
double circumference;
double area;
double radius
double setprecision(2)

diameter = 2 x radius;
circumference= pi*diameter;
area= pi*(radius(pow));

cout<<fixed<<setprecision(2);
cout<<"diameter= "<<diameter<<endl;
cout<<"circumference= "<<circumference<<endl;
cout<<"area= "<<area<<endl;
cout<<"radius= "<<radius<<endl;

system ("pause");
return 0;
}

[offshoreworker]

To use setprecision() you need to include #include <iomanip>

You are missing a ; after your variable radius. You also do not need to declare setprecision as a variable.

The formula for diameter is using an X instead of *.
diameter = 2 * radius;

The pow() function takes in two arguments. pow(variable, power)
area = n * (pow(radius, 2))

Never use system("pause") to keep the console open.
Read the sticky at top of beginners forum for console closing down

If you have any more questions feel free to ask.

[sig226]

Its late so I may be missing something. But you are missing a cin for your user to enter a radius. You will need the statement to be placed above your calculations.

[offshoreworker]

Thanks for catching that sig, I rewrote what he was trying to do and compiled and and left that part out in my explanation.

You will need to add:

cout << "Enter the radius of a circle: ";
cin >> radius;