okay, so, im supposed write a program that gives the mean of three numbers. Problem is, i have no idea what im doing. The program doesnt compile and i dont know if i'm even doing this right.

any help would be greatly appreciated


// This program uses functional decomposition to determine the median // of three input numbers. The user can input the values in any order, // the program determines which value is between the other two.


#include <iostream>
#include <cstdlib>




using namespace std;
int main()

{
int firstNum;
int secondNum;
int thirdNum;
int medianIs;

cout<<"Enter three numbers";
cin>>firstNum>>secondNum>>thirdNum;
cin.ignore();



    if (firstNum <=secondNum)
    if (secondNum<=thirdNum)
        medianIs=secondNum;{
        }cout<<"The Median is"<<secondNum;

}

     else
     if(firstNum<=thirdNum)
     medianIs=thirdNum{
     cout<<"The Median is"<<thirdNum;

}

    else
    medianIs=firstNum;{
       cout<<"The Median is"<<firstNum;
}


    if (thirdnum<=secondNum)

        medianIs = secondNum;{
        cout<<"The Median is"<<secondNum;
}
    if(firstNumb<=thirdNum)
     medianIs=firstNum
     medianIs=thirdNum;



 return 0 ;
}

thats median and not mean, i was previously looking at a post that was median, sorry.

So you figured out your problem or you need a help findinig the mean?

mean is just adding them all together and dividing by the number of values you added...

very simple

~ Geo

~ Don't take life too seriously, you'll never get out alive!

Well...
If you want mean then - what Geo said.
If you want median - let me explain it to you for any number of numbers, not just 3.

Sort the numbers in ascending or decending order. Then pick the "middle" element.
If it is an even no. of numbers then there are two medians (the two middle elements).

Code:
#include<iostream>
using namespace std;
void main()
{
    int size, median, med1, med2, temp;

    cout<<"How many numbers?";
    cin>>size;
    const int S = size;
[s]   int *array=new int ;

    cout<<"Enter the list of numbers: ";
    for(i=0; i<size; i++)
        cin>>array[i];


//Now to sort them (using simple bubble sort)
    for(int i=0; i<size; i++)
        for(int j=0; j<size; j++)
        {
            if(array[i]>=array[j])
            {
                temp = array[i];
                array[i] = array[j];
                array[j] = temp;
            }
        }

//For odd no. of elements (like 3,7,11 etc)
    if (!size%2)
    {
        median = array[(size+1)/2 - 1];
        cout<<endl <<"Median is :" <<median;
    }

//For even no. of elements
    else
    {
        med1 = array[size/2];
        med2 = array[size/2 - 1];
        cout<<endl <<"Median 1 is: " <<med1 <<endl;
        cout<<"Median 2 is: " <<med2 <<endl;
    }
}