Thread: Error: Not supported by pp_c_expression

I've got to compute some integrals using the trapezoidal rule. the two functions are exp(-x^2) and exp(-x). It seems simple enough, but I am getting the following errors:

*'rdiv_expr' not supported by pp_c_expression# 'trapeze.c: In function 'trapeze':
-called object is not a function
-called object 'h' is not a function

Code:

#include <stdio.h>
#include <math.h>
#define a 0
#define b 1

double sum(double h, int i){
    
    /*calculates the steps taken by each iteration*/
    return (a+i*h); 
}

double trapeze(int n, double ans[]){

    /*the step length for the integral, a constant*/    
    double h=(b-a)/n; 

    ans[0]=(h/2)(exp((-a)*a)+exp((-b)*b))+h(sum(h,n-1));
    ans[1]=(h/2)(exp((-a))+exp((-b)))+h(sum(h,n-1));

}

main (void){

    double ans[2];
    int n;

    printf("Enter the number of intervals: \n");
    scanf("%d", &n);

    trapeze(n, ans);
    
.........

Thank you!

Code:

...+h(sum(h,n-1))

h is not a funciton, so you can't use the () immediately after it. Presumably you need something like a * in there. I find it helpful to put a space around my operators to make problems like this stand out more.