说明
以下程序为复习知识点时使用 ,没有真正的通过pat的提交。简单了解一下知识点即可
- A+B Format (20)-PAT甲级真题
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
题目大意:计算A+B的和,然后以每三位加一个”,”的格式输出。
include
include
include
using namespace std;
int main ()
{
int a,b;
string sum;
stringstream ss;
cin>>a;
cin>>b;
ss<<(a+b);
ss>>sum;
int len =sum.length();
for(int i=0;i<len;i++)
{
cout<<sum[i];
if(sum[i]=='-')
{
continue;
}
if((i+1)%3==0&&i!=len-1)
{
cout<<",";
}
}
}
## 知识点 ##
int 类型转化成 string类型
1.加上 #include
stringstream ss;
ss像是一个转化器 吸入所有要转化的东西,然后吐出要转化的类型。
例如 string a=”123”;
ss<