B - Financial Management

B - Financial Management

题目描述：

Larry graduated this year and finally has a job. He’s making a lot of money, but somehow never seems to have enough. Larry has decided that he needs to grab hold of his financial portfolio and solve his financing problems. The first step is to figure out what’s been going on with his money. Larry has his bank account statements and wants to see how much money he has. Help Larry by writing a program to take his closing balance from each of the past twelve months and calculate his average account balance.

输入格式：

The input will be twelve lines. Each line will contain the closing balance of his bank account for a particular month. Each number will be positive and displayed to the penny. No dollar sign will be included.

输出格式：

The output will be a single number, the average (mean) of the closing balances for the twelve months. It will be rounded to the nearest penny, preceded immediately by a dollar sign, and followed by the end-of-line. There will be no other spaces or characters in the output.

输入与输出样例：

思路分析：

这道题只是简单求12个值的平均值，但这道题考的是输入格式EOF的运用，EOF象征文件结束标志。

代码：

#include<stdio.h>
double b[12];
double lemon()
{
	int c=0;
	double d=0;
	while(scanf("%lf",&b[c])!=EOF)
	{
		d+=b[c];
		c++;
		if(c==12)break;
	}
	return d;
}
void lemon2(double d)
{
	printf("$%.2f",d/12);
}
int main()
{
	double d;
	d=lemon();
	lemon2(d);
}