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Apr 1st, 2006

C++ Calculating even Values Problem

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Hey everyone,

I am new to C++ and I was wondering if anyone could help me start off or by guiding me to which method of steps I should take first in solving the following problem:

write a c++ program that with a loop structure that reads in 5 intergers one by one,
calculate the sum of the even values that are read and display the final result.

Any suggestion or comments in regards to the starting point of this problem would be much apprieciated.

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tuannie

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Apr 1st, 2006

Re: C++ Calculating even Values Problem

Have you tried anything yet? We tend to expect at least a tiny amount of code that proves you've made an honest attempt.

Narue

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Apr 1st, 2006

Re: C++ Calculating even Values Problem

Yeh I have attempted of the code, but I seem to can't get the code to work here is attempted code:

int main(){
int count = 1, FirstNum = 0, SecondNum = 0, ThirdNum = 0, FourthNum = 0, FifthNum = 0;
int FirstTotal, SecondTotal , ThirdTotal , FourthTotal, FifthTotal, SumTotal;
bool EvenNum = 1;

cout << "Please input a interger: ";
cin >> FirstNum >> SecondNum >> ThirdNum >> FourthNum >> FifthNum;

FirstTotal = FirstNum % 2;
SecondTotal = SecondNum % 2;
ThirdTotal = ThirdNum % 2;
FourthTotal = FourthNum % 2;
FifthTotal = FifthNum % 2;

if (count >=1)
{
while (count <= 5)
{
if (FirstTotal == EvenNum || SecondTotal == EvenNum || ThirdTotal == EvenNum || FourthTotal == EvenNum || FifthTotal == EvenNum)
{
SumTotal = FirstNum + SecondNum + ThirdNum + FourthNum + FifthNum;
}
}
}
system("pause");
return 0;
}

tuannie

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Apr 2nd, 2006

Re: C++ Calculating even Values Problem

try using an array instead of making 5 variable...

if you still dont get it then read on for the code...

int x[5],sum=0; // creates an array to store 5 integers

for(int i=0;i<5;i++) // loop to take 5 values and evaluate them
{
cin>>x[i];
if(x[i]%2==0) // checks if the nubmer is even or not
{ sum=sum+x[i];
}
}
cout<<sum;

Hope this helps

ultra vires

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Apr 2nd, 2006

Re: C++ Calculating even Values Problem

I haven't been shown using an array as yet. I have only been shown the following techniques, and they are:
1. If statement, nested statement (i.e else if) and briefly on the following loop (for, while and do) as well as a bit of increment i.e number++

Could some one please suggest a technique I could use? i.e. for or while loop or something.

tuannie

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Apr 2nd, 2006

Re: C++ Calculating even Values Problem

Just a rearrangement and modification of your original code. Look and learn.

C++ Syntax (Toggle Plain Text)
#include <iostream>
using namespace std;
int main()
{
    int count = 1, number ; 
    int Total = 0 ;
    while (count <= 5)
    {
        cout << "Please input  interger " << count << " : "; 
        cin >> number ;
        if ( number % 2 == 0 )// % is the Modulus, it gives the remainder after dividing by 2.
        {
              Total = Total + number ;
        }
    }
    cout << "Even Number Total is " << Total << endl ;
    system("pause");
    return 0;
}
#include <iostream>
using namespace std;
int main()
{
    int count = 1, number ; 
    int Total = 0 ;
    while (count <= 5)
    {
        cout << "Please input  interger " << count << " : "; 
        cin >> number ;
        if ( number % 2 == 0 )// % is the Modulus, it gives the remainder after dividing by 2.
        {
              Total = Total + number ;
        }
    }
    cout << "Even Number Total is " << Total << endl ;
    system("pause");
    return 0;
}

WolfPack

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Apr 11th, 2006

Re: C++ Calculating even Values Problem

C++ Syntax (Toggle Plain Text)
#include <iostream>
using namespace std;
int main()
{
    const int MAXNUMS = 5;
    int count;
    int num, total;
 
cout << "\nThis program will ask you to enter " << MAXNUMS << " numbers.\n";
count = 1;
total = 0;
    while (count <= MAXNUMS)
    {
        cout << "Please input integer " << count << " : "; 
        cin >> num;
        if ( num % 2 == 0 )// % is the Modulus, it gives the remainder after dividing by 2.
        {
              total = total + num ;    
        }
    count++;
}
    cout << "Even Number Total is " << total << endl ;   
 
    system("pause");
    return 0;
}
#include <iostream>
using namespace std;
int main()
{
    const int MAXNUMS = 5;
    int count;
    int num, total;

cout << "\nThis program will ask you to enter " << MAXNUMS << " numbers.\n";
count = 1;
total = 0;
    while (count <= MAXNUMS)
    {
        cout << "Please input integer " << count << " : "; 
        cin >> num;
        if ( num % 2 == 0 )// % is the Modulus, it gives the remainder after dividing by 2.
        {
              total = total + num ;    
        }
    count++;
}
    cout << "Even Number Total is " << total << endl ;   
             
    system("pause");
    return 0;
}

this should help you out, only calculates the even numbers out of 5 inputs, displaying the total of the even numbers at the end.

you can thank me later :mrgreen:

viet_mafia

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Jan 19th, 2008

Re: C++ Calculating even Values Problem

cpp Syntax (Toggle Plain Text)
#include <iostream>
using namespace std;
 
int main()
{
 
	int num;
	cout << "enter a number: ";
	cin >> num;
	int count = 0;
	int sum = 0;
	do
	{
		if(num % 2 == 0)
		sum += num;
		count++;
		cout << "enter a number again: ";
		cin >> num;
	}while(count < 5);
	cout << sum << endl;
	return 0;
}
#include <iostream>
using namespace std;

int main()
{
	
	int num;
	cout << "enter a number: ";
	cin >> num;
	int count = 0;
	int sum = 0;
	do
	{
		if(num % 2 == 0)
		sum += num;
		count++;
		cout << "enter a number again: ";
		cin >> num;
	}while(count < 5);
	cout << sum << endl;
	return 0;
}

Last edited by WolfPack; Jan 19th, 2008 at 9:53 am. Reason: Added [CODE=CPP][/CODE] tags

khanh1975

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