#include<bits/stdc++.h>
using namespace std;
int main()
{
double a=1.109;
float b=1.01;
cout<<"兩位有效數字"<<setprecision(2)<<a<<endl;//.0不會輸出
cout<<"兩位小數"<<fixed<<setprecision(2)<<a<<endl;//.0不會輸出
}
#include<bits/stdc++.h>
using namespace std;
int main()
{
double a=1.109;
float b=1.01;
cout<<"兩位有效數字"<<setprecision(2)<<a<<endl;//.0不會輸出
cout<<"兩位小數"<<fixed<<setprecision(2)<<a<<endl;//.0不會輸出
}