need help with my code please

[Fyah]

i have to create a program where you enter a number and the programs adds up to that number for example

enter number: 4 (user input)
your total is: 10

basically (in this example) the program added 1+2+3+4 = 10, but when i execute my program i get

enter number: 4 (user input)
your total is: 8 ***? whats wrong with my code?

int main()
{
	int count, num, finalans;

	
		cout << "add up til this number : ";
		cin >> num;
for (count = 0;count<=num;count++)
			finalans = num + count;
		cout << "Your total is : " << finalans;
		_getch();
	return 0;
}

[Daleth]

Try this on line 9.

finalans += count; //equivalent to finalans = finalans + count 

This will add count to the current value of finalans and assign the result to finalans.

Your current instruction simply assigns new values to finalans, so when count = num, finalans = 4+4.

Oh, and you should initialize finalans with 0 to avoid any possible junk assignment when it was declared.

[Fyah]

how could i include a do while loop or switch in this code?
example i want this code to keep executing after it asks "do you want to exit program" and you enter no ", it asks again, "enter number:" and executes the program again.

im trying to get the program to keep executing if you dont exit the program after it asks you if you want to exit.

[kinley]

You could try something like this

char choice;

do
{
// Your code

cout << "Do you want to exit program? (Y/N)";
cin >> choice;
}while(choice == 'N');

[Daleth]

Kinley, don't you mean:

   }while ((choice != 'N') || (choice != 'n'));

[LB]

It should be ==, not !=
Otherwise saying "No, I do not want to exit the program" would exit and saying "Yes, I would like to exit" would keep it going.

[Daleth]

Oh, haha. I guess I misread that line. Thanks for correcting me.

[Fyah]

Thats the problem i am having with the do while, every time i want to continue it does everything correct but it keeps adding up my final answer
example:

Add up til this number: 10(user input)
total: 55
Exit?: N
Add up til this number: 10 (user input)
total: 110****i need it to show me 55 again, not add 55 to the first 55 and give me 110.
Exit?:N
Add up to this number: 10 (user input)
total: 165 ****it keep adding up the totals i just want it to show me 55 everytime if i put 10.
Exit?:

thats why i was asking for help with the do while loop, but thank you all for your help i really appreciate it. i dont know why its so difficult for me to figure this one out? please help.

[vlad from moscow]

It is obvious that the variable that stores the sum is not set to zero before each new iteration.

[cyberdude]

I think i have found out the problem with your code.As Daleth has found out the problem is with line 9.
change line 3 to: int count, num, finalans=0; // initialize finalans as 0 .
and line 9 to: finalans =count+finalans;// adds the recurring variable to existing value of finalans
Just follow the rest of the code.
Guess this will be helpful.
cheers,.
cyber dude

[Fyah]

I DID have finalans = 0 , but i needed to put it before the FOR function and after the DO, because the way i had it declared was

int finalans, count, num;
finalans = 0;
do
{
code // but i realized i needed to declare it here in this code
}
for()
code

and it wasnt working, but then i realized i hadnt tried putting it in between do and for and it worked. thanks again guys.

[Sam99]

@Fyah
Probably u want this>

//codded by_Lutu Putu_(From Independent university, Bangladesh)
#include <iostream>
#include <conio.h>
using namespace std;
int main()
{
    int n, i, sum=0;
    char ch;
    
    do{
    cout<<"Enter number: ";
    cin>>n;
    for(i=1; i<=n; i++)
             sum+=i;
    
   
    cout<<"The output is: "<<sum;
    sum=0;
    cout<<"\n\nDo you have number?\n";
    cin>>ch; 
    cout<<endl;
    }while(ch=='Y' || ch=='y');
    
    getch();
    system ("Pause");
    return 0;
}

[LB]

@Sam99 please do not post or suggest non-standard code. <conio.h> is nonstandard:
http://en.wikipedia.org/wiki/Conio.h

Also please do not recommend use of "system":
http://www.cplusplus.com/forum/articles/11153/

[Sam99]

Then what I should? :)

[LB]

You can put this in a function:
http://www.cplusplus.com/forum/beginner/1988/#msg7263

[Donnie]

Hi Fyah, this works well using the brilliant Gauss equation mentioned in TV's "Person of Interest"!

#include <iostream>
using namespace std;
int main()
{
    char z;
    cout <<"\nThis program enables you to add together all the numbers \n\n"
    "in a sequence from 1 up to a number of your choice. \n\n"
    "Press Enter to continue.";
do
    {
    int b;
    cin.get();
    cout <<"\nPlease enter the number of your choice: ";
    cin >> b;
    cin.get();
    cout <<"\nYou entered: "  <<b;
    cin.get();
    cout << "\nThe answer is: ";
    cout << (1+b)*(b)/2; "\n";
    cin.get();
    cout<<"\nWant to try it again? y/n ";
    cin>>z;
    cin.get();
    }
while (z == 'y');
    return 0;
}

I originally made it to add all the numbers in any sequence. Tell me if you'd like the code. Cheers, Don

[Sam99]

@L B
You mean #include <limits> instead of #include <conio.h> ?

[LB]

I mean don't #include <conio.h> at all.

[eyenrique]

I think this is a simple way

#include <iostream>
using std::cout;
using std::cin;
using std::endl;

//You can use "using namespace std;" instead of...

int main(){

int value;
int sum=0;

cout<<"Enter your number(or -1 to exit): ";
cin>>value;

while(value!=-1){
        if(value==0||value==1){
                cout<<"Your total is: "<<value<<endl;
        }else{
                for(int addNumber=1;addNumber<=value;addNumber++){
                        sum+=addNumber;
                }//end loop for
                cout<<"Your total is: "<<sum<<endl;
                sum=0; //re-start your sum variable
        }//end if...else
cout<<"Enter your number(or -1 to quit): ";
cin>>value;
}//end loop while


return 0; //successful termination
}//end main