Trouble putting together the menu

[javyesco]

I'm having trouble making the switch menu; I want to assign each case to do an specific thing; I labeled everything so you know what I'm talking about.




#include<iostream>
using namespace std;
float getvalue();
float getsum(float &sum, int values[]);
float getaverage(float sum);
float getbiggest(int values[]);
float getlowest(int values[]);
int main()
{
char option;
float V;

V = getvalue();

switch (option)
{
case 1:

//SUM FUNCTION

break;
case 2:

//AVERAGE FUNCTION

break;
case 3:

//BIGGEST NUMBER FUNCTION

break;
case 4:

//LOWEST NUMBER FUNCTION

break;

}

system("pause");
return 0;
}

//GET VALUE
float getvalue()
{
int values[6];
for (int x = 0; x < 6; x++)
{
cout << "Enter Value: ";
cin >> values[x];
}
}

//GET THE SUMM
float getsum(float &sum, int values[])
{
for (int x = 0; x < 6; x++)
{
sum += values[x];
}

return sum;
}

//GET THE AVERAGE NUMBER
float getaverage(float sum)
{
float average;

average = sum / 6;

return average;
}

//GET THE BIGGEST NUMBER
float getbiggest(int values[])
{
float biggest;

for ( int x = 0; x < 6; x++)
{
if (values[x]>biggest)
{
biggest = values[x];
}
}

return biggest;
}

//GET THE LOWEST NUMBER
float getlowest(int values[])
{
float lowest;

for (int x = 0; x < 6; x++)
{
if (values[x] < lowest)
{
lowest = values[x];
}
}

return lowest;
}