How can I Integrate an exponential function using trapezium rule with n varying intervals

Question

Please I really need help. I keep running my program but no matter what loop I try or intervals I put, program just keeps running forever. Here's the code

#include<stdio.h>
#include<conio.h>
#include<math.h>
#define w 2004
#define n 10
float fn(float x)
{
exp(-(w*(x*x)));
return exp(-(w*(x*x)));
}
main()
{
int i;
float a=-1,b=1,s,y,h;
s=0;
done:
    n+10;
    if(n<=100){
        i=1;
        do{
            s=s+fn(a+i*h);
            i++;
            continue;
        }
        while(i<n-1);
        h=(b-a)/n;
        y=(fn(a)+fn(b)+2*s)*h/2;
        printf("\nThe value of y is=%0.4f\n", y);
        goto done;
    }
    return 0;
}

Answer 1

Your question lacks vital information. However, something like

while(i<n-1);

cannot be sane. None of the variables changes inside the loop, so it will loop forever (wasn't that what you noticed?).