PAT (Advanced Level) Practise 1001. A+B Format (20)
2017-03-19 15:41
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1001. A+B Format (20)
时间限制400 ms
内存限制
65536 kB
代码长度限制
16000 B
判题程序
Standard
作者
CHEN, Yue
Calculate a + b and output the sum in standard format -- that is, the digits must be separated into groups of three by commas (unless there are less than four digits).
Input
Each input file contains one test case. Each case contains a pair of integers a and b where -1000000 <= a, b <= 1000000. The numbers are separated by a space.
Output
For each test case, you should output the sum of a and b in one line. The sum must be written in the standard format.
Sample Input
-1000000 9
Sample Output
-999,991
原题链接:https://www.patest.cn/contests/pat-a-practise/1001
题意:计算两个数的和,结果加千分符(,)分隔.
原以为要用字符串处理,后来一想,用递归就可以解决,万能的递归.
AC代码:
#include <iostream>
#include <cstdio>
using namespace std;
void fun(int x)
{
if(x/1000>0)
{
fun(x/1000);
printf(",%03d",x%1000);//不足三位添零补
}
else
{
cout<<x%1000;
}
}
int main()
{
int a,b;
while(cin>>a>>b)
{
int c=a+b;
if(c<0)
{
cout<<"-";
c=-c;
}
fun(c);
cout<<endl;
}
return 0;
}
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