lottery.cpp

一个彩票统计源代码

#include "iostream.h"

  const int NUM=30;
  void main(void)
  {
  double *x;
  double sum,sumx=0,mean;
  int *n;
  n=new int;
  //if (n==Null)  return;
  do {
  cout<<"Enter the number of data:";
  cin>>*n;
  cout<<"\n";
  }while (*n<2||*n>NUM);
  
  x=new double[*n];
  if(!x) {delete n;
          return;
  }
  
  for (int i=0;i<*n;i++){
  cout<<"x["<<i<<"]:";
  cin>>x[i]; 
  }

  sum=*n;
  for (i=0;i<*n;i++)
	  sumx+=*(x+i);
      mean=sumx/sum;
	  cout<<"\n mean="<<mean<<endl;
	  delete n;
      return;
	   
  }