Combining Functions

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Hi i have to program a code to perform 1 of 5 functions at the users
request, I have got to the part where i have to program the equations
and i cant seem to get them to link together. Basicly when the used
enters his radians i was to link to a sin x function to calculate the
sin of the number also there will be a factorial function and a cos
function. but none of them are linking.

#include <iostream>

using namespace std;

int factorial()
{
int i=0;
for (i=0; i>0; i--)


return 0;
}




double sin()
{
double sin=0;
double x=0;

sin=x-(x*x*x/(3*2*1))+(x*x*x*x*x/(5*4*3*2*1));

return sin;
}

int main()
{
int item=0;
double x=0;
double pi=3.14159265;

cout <<"Please enter your x value in radians : ";
cin >> x;

cout <<"Select the Equation to Perform:";
cout <<"\n";
cout <<"1 = sin(x)\n";
cout <<"2 = cos(x)\n";
cout <<"3 = tan(x)\n";
cout <<"4 = sin^2(x) + cos^2(x)\n";
cout <<"5 = 2sin(x)cos(x)\n";
cout <<"Enter the Number: ";
cin >> item;

switch (item){
case 1:
cout <<sin();
cout <<"\n\n\n";
break;
case 2:
cout << "Case 2\n\n";
break;

case 3:
cout << "case 3\n\n";
break;
case 4:
cout << "case 4\n\n";
break;
case 5:
cout << "case 5\n\n";
break;
default:
cout <<"No Number Entered";
break;
}


return 0;
}



--
Nutkin
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