c++语言求平均值

[输入]1d2d3
1.5

#include <string.h>33
#include <iostream.h>
#include <stdlib.h>

void m()
{
double sum=0;
int n=0;
char *temp = new char[300];
char *p=new char[12];
int at=0;
cin>>temp;
for(int i=0;i<strlen(temp);i++)
{
if (*(temp+i)=='d')
{
strncpy(p,temp+at,i-at+1);
double t=atof(p);
sum+=t;
n++;
at=i+1;
}
}
cout<<sum/n;
}

int main()
{
m();
int dl;
while(1){cin>>dl;}
return 0;
}

用gets()或cin.getline（）都行啊