Stuck

daking_09 · #1 03-Apr-2006, 00:29

Sorry just stuck on this quesiton. this is the question and below is what ive done so far, dont know how to do a calculation that would add the purposed values.

For this question create two files called A2Part3.txt and A2Part3.cpp.
Write a program that asks the user to enter a positive integer value.
The program should use an iterative control structure (loop) to get the sum of all integers
from 1 up to and including the number entered, excluding:
- All numbers that are wholly divisible by 3.
- All even numbers that are less than or equal to 10.
For example, if the user enters 50, the program should compute 1 + 5 + 7 + 11 + 13 + 14 +
16 + … + 50.
If the input provided by the user is a negative number or 0, then your program merely
displays an appropriate error message. The following shows 2 sample interactions with the
program.

CPP / C++ / C Code:

#include <iostream>
using namespace std;

int main()
{
    int num;
	
	cout << "Enter a positive integers: ";	
	cin >> num;
		
	if (num <= 0) 
	{		
		cout << "\nError: Entered Integer must be greater than zero\n";	 
	}
	
	
		
    
	
	return 0;
}

ubergeek · #2 03-Apr-2006, 00:49

so once you know num, you can create a for loop that will count up from one to num. keep a variable (defined outside the loop) that will hold your total. each time through the loop, check whether the counter is divisible by three (use the modulus operator) or whether it is even and <= 10. Otherwise, add it to the total.

CPP / C++ / C Code:

if (i % 3 == 0) continue; //if divisible by three, no good
if ( (i <= 10) && (i % 2 == 0) ) continue; //if less than or equal to 10 and even
total += i;

daking_09 · #3 03-Apr-2006, 01:04

This is what i got but dont work, it makes sense what your saying to me but trying to put that into hard code, is where im strugging.

CPP / C++ / C Code:

#include <iostream>
//mm287@uow.edu.au
using namespace std;

int main()
{
    int num, total;
	
	cout << "Enter a positive integers: ";	
	cin >> num;
		
	if (num <= 0) 
	{		
		cout << "\nError: Entered Integer must be greater than zero\n";	 
	}
	
	 count = 0;
	 while count <= num
	 total = 0
	 total = num + 1
	 if (num % 3 == 0) continue; //if divisible by three, no good
   	 if ( (num <= 10) && (num % 2 == 0) ) continue; //if less than or equal to 10 and even 
	 total += num;
	
	return 0;
}

daking_09 · #4 03-Apr-2006, 01:26

Got this much now.

CPP / C++ / C Code:

#include <iostream>
using namespace std;

int main()
{
    int num = 0,totnum = 0, total = 0;
	
	cout << "Enter a positive integers: ";	
	cin >> num;
		
	while (num <= 0) 
	{		
		cout << "\nError! You entered an incorrect value.\n";
		cout << "Enter a positive integers: ";	
		cin >> num;	 
	}
	
	while(totnum <= num)
	{	
		if (totnum % 3 == 0) continue; 
		if ( (totnum <= 10) && (totnum % 2 == 0) ) continue;
		
		
		
			totnum++;
		else
		{
			total = total + totnum;
			totnum++;
		}
	}
	cout << "Start" << "End" << "Sum" << endl; 
	cout << " 1 " << "   " << num  << "   " << total << endl;
	return 0;

}

WaltP · #5 03-Apr-2006, 10:53

Quote:

Originally Posted by daking_09

Got this much now.

CPP / C++ / C Code:

#include <iostream>
using namespace std;

int main()
{
    int num = 0,totnum = 0, total = 0;
	
	cout << "Enter a positive integers: ";	
	cin >> num;
		
	while (num <= 0) 
	{		
		cout << "\nError! You entered an incorrect value.\n";
		cout << "Enter a positive integers: ";	
		cin >> num;	 
	}
	
	while(totnum <= num)
	{	
		if (totnum % 3 == 0) continue; 
		if ( (totnum <= 10) && (totnum % 2 == 0) ) continue;
		
		
		
			totnum++;
		else
		{
			total = total + totnum;
			totnum++;
		}
	}
	cout << "Start" << "End" << "Sum" << endl; 
	cout << " 1 " << "   " << num  << "   " << total << endl;
	return 0;

}

Did you read the Guidelines -- esp the one about error messages (#2)? That will help both us and you figure out what is wrong.

You almost have it. What if does that else refer to?

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