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# Problem In My C++ Source Code

### #1 vhalerielee

vhalerielee

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• Local time:02:34 AM

Posted 22 September 2006 - 01:17 AM

Hey guys, I need a bit of help here. I am having problems with this code:

================================================================
```#include <iostream>
#define MAX 50

void poly(int n, double a[], const double x0, double p)
{
int i;
p = a[n];
for(i = n-1; i >= 0; i--)
{
p = a[i] + x0*p;
}
printf("%lf", p);
}

int main()
{
int i,n;
double x0,p;
double a[MAX+1];

printf("Degree of polynomial: ");
scanf("%d",&n);
if(n > MAX || n == MAX)
{
printf("Degree must be less than or equal to 50\n");
do
{
printf("Degree of polynomial:\n");
scanf("%d", &n);
} while (n > MAX || n == MAX);
}
printf("Coefficients, a[0], a[1], ..., a[%d]\n", n);
for(i = 0; i <= n; i++){
scanf("%lf", &a[i]);
}
printf("value of x = ");
scanf("%lf", &x0);
poly(n,a,x0,p);
}```
============================================================

this program is about evaluating a polynomial. For example, x^2 + 2x + 1, if x=2, the output would be 9. It won't work on polynomials with a degree higher than 2... there's a problem on the algebraic part... so maybe guys you could figure it out for me... I think there's a problem in this part:
```void poly(int n, double a[], const double x0, double p)
{
int i;
p = a[n];
for(i = n-1; i >= 0; i--)
{
p = a[i] + x0*p;
}
printf("%lf", p);
}```

thanks guys and more power!

### #2 groovicus

groovicus

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• Local time:12:34 PM

Posted 24 September 2006 - 10:19 AM

It works just fine once the programing errors are fixed. Well, it worked for 3,4, and 5 degrees, so I didn't check any further. I assume that since it worked in those cases that it should work in all cases.

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