Comp help. (1 Viewer)

[ND]

I'm having problems with using a function within a function (i think it's called recursivity or recursion or something). Can anyone (preferably a COMP125 or greater student) have a look at my code and tell me what the problem is? I don't get any errors in compiling, but when i execute, after i input, the program calculates for half a sec, then just closes. Anyway here's the code:

#include <iostream.h>
#include <stdlib.h>

using namespace std;

int sdl(int a)
{
int dig1, dig2, r;
dig1=a/10;
dig2=a%10;
r=dig1*dig1+dig2*dig2;
if(r==1||r==4)
return (r);
else
return sdl(r);
}

int main()
{int n;
cin>>n;
cout<<sdl(n)<<endl;

Thanks for any help.
system("PAUSE");
return 0;
}

edit: i should probably tell you what i want it to do. A 2-digit number is inputted, and the program should separate the number up and square the two numbers, then sum them. This process should then be applied to the resulting value. (i.e. 14 is broken into 1 and 4, then 1^2+4^2=17, then 17 --> 1 and 7 --> 1^2+7^2=50 and so on.)

 

[flamin']

the fun of comp is debugging it yourself =P hehe

 

[ND]

Believe me i've tried, i even got a friend who's doing 125 to look at it and he can't see the problem. =/

 

[Rahul]

i think...that you arent even running the sdl().

you have to remember that main() will be executed.

and no where in main do you tell the program to run sdl().

int main()
{int n;
cin>>n;
sdl() //try putting sdl(int a) instead..not sure with parameters
cout<<

Thanks for any help.
system("PAUSE");
return 0;
}

 

[ND]

It's there, it's just that the forum's not showing it. Quote my post to see the original code.

 

[Rahul]

oh ok.

you can use {code} {/code} [] instead of {}

cout << "doesnt eat up code" << endl;