PTA 1001 A+B Format

Posted 2021-03-10 jarvis-yang

问题描述：

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 Specification:

Each input file contains one test case. Each case contains a pair of integers a and b where −. The numbers are separated by a space.

Output Specification:

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

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没啥难的，水一篇罢了，帮狗子同学改的代码，缩进没改。

 

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代码：

 

 1 #include <iostream>
 2 #include <cmath>
 3 using namespace std;
 4 int main()
 5 {
 6  int a,b,sum=0;
 7  long x;
 8  char num[30]={};
 9  cin>>a>>b;
10  x=a+b;
11  if (x>0){
12  while (x!=0)
13  {
14   num[sum]=x%10+48;
15   x=x/10;
16   sum++;
17  }
18  for (int i=sum-1;i>=0;i--)
19  {
20   cout<<num[i];
21   if (i%3==0&&i!=0)
22    cout<<",";
23  }}
24  else if (x==0)
25   cout<<"0";
26  else
27  {
28   while (x!=0)
29  {
30   num[sum]=abs(x%10)+48;
31   x=x/10;
32   sum++;
33  }
34  cout<<"-";
35  for (int i=sum-1;i>=0;i--)
36  {
37   cout<<num[i];
38   if (i%3==0&&i!=0)
39    cout<<",";
40  }}
41  return 0;
42 }