C++习题

打印菱形

#include<iostream>
using namespace std;
int main()
{
cout<<" *"<<endl;
cout<<"***"<<endl;
cout<<" *"<<endl;
return 0;
}

进制转换

#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
int a;
cout<<"请任意输入一个十进制数:";
cin>>a;
cout<<"八进制："<<oct<<a<<"十六进制："<<hex<<a<<endl;
return 0;
}

循环小数精度从小到大列出

#include<iostream>
#include<iomanip>
using namespace std;
int main()
{

int number1,number2;
cout<<"请输入两个数：";
cin>>number1>>number2;
if(0==number2)
{
cout<<"请重新输入两个数：";
return 1;
}

double result=static_cast<double>(number1)/(number2);
for(int precision=1;precision<=10;++precision)
{
cout<<"精度为"<<precision<<"的结果是:";
cout<<fixed<<setprecision(precision) <<result<<endl;

}
return 0;
}