Thread: problem with numerical calculations

Hi there,

I'm trying to write a program which calculates the average mark of three tests but I can't figure out how to do the basic math, I know this sounds stupid but I can't seem to find any examples anywhere.

Code:

#include <iostream>

using namespace std;

int main()
{
    int pass = 15;
    int french, german, spanish;
    int mark = (french+german+spanish)/3;
    
    cout<<"LANGUAGE COURSE\n";
    cout<<"\n";
    cout<<"Enter French mark.";     // I don't need the cursor to move             
    cin>> french;                             // down.
    cin.ignore();
    cout<<"Enter German mark."; 
    cin>> german;
    cin.ignore();
    cout<<"Enter Spanish mark.";
    cin>> spanish;
    cin.ignore();
    cout<<"Your percentage mark was "<< mark <<".\n";
    cin.get();
}

It compiles and runs but when I enter for example 21 for french, 18 for german and 13 for spanish it displays the average 697034459.
i have never done maths in c++ before and I can't find any relevant help anywhere so any links or other help will be very welcome.

Calef13

You have to assign french, german and spanish a number first, because else it will go wrong.

do it like this:

int french = 0, german = 0, spanish = 0;

This way the 0's will be overwritten by the user's input, and displays the average.

And you shoud do the calculation of the average after the input of the marks.
Kurt

That's correct, because (0 + 0 + 0)/3 = 0.
My bad.

Thanks a lot , it's working brilliant, not that I doubted it would

Calef13