Hey guys..i just wrote a program but it's not running..can someone please help me..

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a program using functions to convert a number entered by the user to meters and kilometers

What I have tried:

#include <iostream>

using namespace std;
int meters(int a);
int kilometers(int a);
main()
{
int a;
cout<<"enter the numbers";
cin>>a;
cout<<"the number in meters is:"<<meters(a);
cout<<"the number in kilometers is:"<<kilometers(a);
}
int meters(int a)
int kilometers(int a)
{
int x;
x=a*100;
return(x);

int x;
x=a*1000;
return(x).
}