poj1004--Financial Management（对%lf与%f的控制）

最新推荐文章于 2019-03-09 15:46:31 发布

刀刀狗0102

最新推荐文章于 2019-03-09 15:46:31 发布

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本文链接：https://blog.youkuaiyun.com/winddreams/article/details/25800429

本博客介绍了一个简单的程序，用于计算过去十二个月银行账户的平均余额，帮助理解财务状况。

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Financial Management

Time Limit: 1000MS		Memory Limit: 10000K
Total Submissions: 124921		Accepted: 55639

Description

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.

Input

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.

Output

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.

Sample Input

Sample Output

$1581.42

Source

#include <stdio.h>
int main()
{
    int i ;
    double num , a ;
    num = 0 ;
    for(i = 0 ; i < 12 ; i++)
    {
        scanf("%lf", &a);
        num += a ;
    }
    printf("$%.2f\n", num/12);
    return 0;
}

水题一个，求12个数的平均值，但是double型的数在使用%lf在求平均值后四舍五入会出现误差，如0.005 可能会出现0.005000000001

或0.00499999999两种，而使用%f输出就A了

在scanf中区分%lf与%f

在printf中不区分%lf与%f （按照严格的C语言，prinf是不能使用"%lf"来输出的，float或者double的输出都应写作"%f",出自百度。。。。。。）