Who speaks C?, printf("I'm stuck/n"); Options

[MattR]

I'm trying to finish up some homework. Its not last minute (due tomorrow night), but I'm stuck. Britt and I have been trying to debug for a little while but with no luck.

The problem:

I'm trying to solve the integral 2*sqrt(1-x*x) from -1 to 1 using the trapezoidal rule. Basically I have to solve the equation:
h[f(x1) + f(x2) + ... + f(x n-1)] where x1, x2, etc. is the function evaluated at the point x1, x2, etc. along the x axis. the distance between x1 and x2 is a-b/n, which is the distance of the interval. I will need to input the number of intervals and be given an approximation for the function.

Here is my code;
#include
#include

int main(void)
{

int n;
int f=0;
int J;
int x=-1;


printf("Please enter the number of subdivisions n:");
scanf("%d",&n);

While (x<=1)
{
x = x+2/n;
f = f+2*sqrt(1-x*x);
}

J=2/n*f;

printf("The approximate integration by Trapezoidal Rule is: %d \n",J);

return 0;
}

Does anybody see anything thats glaring? I'm getting an error in line 23 (after the While (x<=1) that wont stop...