用Romberg算法计算定积分

#include <stdio.h>

#include <math.h>

#define MAX 10

double func(double a)

{

double y

if (a == 0)

return y = 1

else

return y = 4/(1+a*a) //return y = pow(a,2)

}-Romberg algorithm computes definite integrals using# include <stdio.h># Include <math.h># Define MAX 10 double func (double a) {double y　if (a == 0) return y = 1　else return y = 4/(1+a* a) // return y = pow (a, 2)　}