[POJ] #1004# Financial Management : 浮点数运算

一. 题目

Financial Management

Time Limit: 1000MS		Memory Limit: 10000K
Total Submissions: 173910		Accepted: 65186

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

100.00
489.12
12454.12
1234.10
823.05
109.20
5.27
1542.25
839.18
83.99
1295.01
1.75

Sample Output

$1581.42

Source

Mid-Atlantic 2001

 

二. 题意

• 给出最近十二个月，银行账户的每期余额
• 算出每个月的平均余额

三. 分析

• 算法核心: 题目较为简单，无需考虑任何算法
• 实现细节:
  • 浮点数运算
  • 浮点数输出格式

四. 题解

 #include <stdio.h>

 int main()
 {
     int i;
     float balance, sum = ;

     for (i = ; i < ; i++) {
         scanf("%f\n", &balance);
         sum += balance;
     }

     printf("$%.2f\n", (sum / ));

     return ;
 }