#include<stdio.h>
void ave_temper1()
{
	float temper[31];
	float sum=0;
	int num,day=0;
	float *p;
	do
	{
		printf("enter temperature for day %d: ",day++);
		scanf("%f",p);
	}
	while( *(p++)>0 );
	p=temper;
	num=day-1;
	for(day=0;day<num;day++)
	{
		sum+=*(p++);
	}
	printf("average is %4.1f ", sum/num);
}