C语言-预估校正法求常微分方程

#include<stdio.h>

#include<math.h>

#define n 14

int main(){

    double a = 0.0, b = 1.4,h,m=0.0;

    //int n = 14;

    double x[n + ] = { 0.0 }, y[n + ] = {  };

    h = (b - a) / n;

    x[] = a;

    y[] = m;

    for (int i = ; i <= n; i++)

    {

        y[i] = y[i - ] + h*( + y[i - ] * y[i - ]);

        x[i] = a + i*h;

        y[i] = y[i - ] + h*0.5*(( + y[i - ] * y[i - ]) + (+y[i]*y[i]));

        printf("x[%d]=%e , y[%d]=%e\n",i, x[i], i, y[i]);

    }

    return ;

}