URL: http://acm.zju.edu.cn/show_problem.php?pid=1048
Problem:
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 Format:
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 Format:
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:
$1581.4
My solution:（C++，GCC）
It will be an easy task if you have catched the meaning of author. Simply sum up all numbers you get from input stream, and then divide it by twelve, you will get the mean of the closing balances. But it is easy to missunderstand format of output if you did not read carefully. It is a trap for the guys who solve the problem in a hurry.
#include <iostream>
// PS: The code is for study purpose only, never submit it as ones own.
// From: http://mskia.oicp.net/
// email: ichobits@21cn.com
int main(void) {
double total = 0, m;
for (int i = 0; i < 12; i++) {
std::cin >> m;
total += m;
}
}
