change

#include<iostream>
using namespace std;
int main()
{
    double a;
    cin>>a;
    cout<<a<<endl;
    return 0;
}
#include<iostream>
#include<math.h>
#define pi 3.1415
using namespace std;
int main()
{
    int conver(double & a,double & b);
    int conver(double a,double b,double c[]);
    double a=0,b=0;
    double c[2]={0,0};
    cout<<"Please input the length and angle :"<<endl;
    cin>>a>>b;
    //conver(a,b);
    conver(a,b,c);
    cout<<a<<endl<<b<<endl;
    cout<<c[0]<<endl<<c[1]<<endl;
    return 0;
}
int conver(double& a,double& b)
{
    double c;
    c=a;
    a=c*cos(b*pi/180);
    b=c*sin(b*pi/180);
    return 0;
}
int conver(double a,double b,double c[])
{
    c[0]=a*cos(b*pi/180);
    c[1]=a*sin(b*pi/180);
    return 0;
}