基于C++的BP算法

#include"stdio.h"
#include"iostream.h"
#include"math.h"
#include"stdlib.h"
#include"time.h"
#define PI 3.1415926
void main()
{
int m;
double x;
double a;
double y;
int k;
double d;
//cout<<"请输入中子数:";
//cout<<endl;
//cin>>m;
    //cout<<"请输入防护墙的厚度:";
//cout<<endl;
//cin>>d;
    int n=0; 
m=100;
d=1000;
    x=0;
    for (int i=0;i<m;i++)            
     {                             
        for (int j=0;j<100;j++)     
         {
srand((unsigned)time(NULL));
k=rand()%360;

//y=(32768-k)/32768*PI;
y=(2*PI*k)/360; 
    x=x+cos(y);

            if (x>d)
{
                n++;
break;
}


}  

} 
 
     a=n;
 cout<<"中子以任意角度进入厚度的防护墙时中子逸出百分比为:";
     cout<<a<<endl;
} 
#include"stdio.h"
#include"iostream.h"
#include"math.h"
#include"stdlib.h"
#include"time.h"
#define PI 3.1415926
void main()
{
int b[100],c[50];
double x;
double a;