How to use the values of one userdefine function into another user define function ? the code is given below .

#include<iostream>
#include<cmath>
float mean(float,float,float,float,float);
float sd(float,float,float,float,float,float);
using namespace std;
 main()
{
   float g,i,j,k,l,m;
   mean(i,j,k,l,m);
   sd(g,i,j,k,l,m);
   
   
}
float mean(float x1,float x2,float x3,float x4,float x5)
{
	float me;
	cout<<"Enter The Values Of X1, X2, X3, X4 & X5 , To Find The MEAN"<<endl;
    cin>>x1>>x2>>x3>>x4>>x5;
	me= (x1+x2+x3+x4+x5)/5;
    cout<<"Mean Is = "<<me<<endl;
    
	
}
float sd(float x,float x1,float x2,float x3,float x4,float x5)
{
	float y,sd;
		cout<<"Enter The Values Of X, X1, X2, X3, X4 & X5 , To Find The STANDARD DERIVATION"<<endl;
    cin>>x>>x1>>x2>>x3>>x4>>x5;
	x= (pow ((x1-x),2) + pow ((x2-x),2) + pow ((x3-x),2) + pow ((x4-x),2) + pow ((x5-x),2))/5;
	sd= sqrt(x);
	cout<<"Standar Derivation of Given Data Is = "<<sd<<endl;
}