Question

C++编程 用梯形求积公式求解定积分∫3lnxdx积分区间为（1,2）的值

Answer 1

#include "stdio.h"

#include "math.h"

#define N 100

void main()

{

double delta=1.0/N;

double x=1;

double y1,y2;

double s=0;

y1=0;

while(x