Code works excep for menu please help

[dagreat45]

My Whole Code works but Im having trouble with my int main Options menu can some please check that for me and tell me what I'm doing wrong??


#include <iostream>
#include <math.h>

using namespace std;
static const float PI = (float)(2*acos(0.0));

float period(float length,float g)
{
return (float)(2*PI*sqrt(length/g));
}

int a=0;
int b =0;
int c =0;

typedef struct node
{
int* val1;
int* val2;
struct node* left;
struct node* right;
int isleaf;
int* ptrs[3];
}node;

//tree consturtcion
node node1 = {NULL,NULL,NULL,NULL,1, {&a,&b,&c } };
node node2 = {NULL,NULL,NULL,NULL,1, {&a,&c,&b } };
node node3 = {NULL,NULL,NULL,NULL,1, {&c,&a,&b } };
node node4 = {NULL,NULL,NULL,NULL,1, {&b,&c,&a } };
node node5 = {NULL,NULL,NULL,NULL,1, {&c,&b,&a } };
node node6 = {&a,&c,&node2,&node3,0, NULL };
node node7 = {NULL,NULL,NULL,NULL,1, {&b,&a,&c } };
node node8 = {&b,&c,&node4,&node5,0, NULL };
node node9 = {&b,&c,&node1,&node6,0, NULL };
node node10 = {&a,&c,&node7,&node8,0, NULL };
node node11 = {&a,&b,&node9,&node10,0, NULL };

void rsort( node* ptr )
{
if(ptr->isleaf ==1){
int i=0;
int value;
cout<<"printing the sorting order\n";
while(i < 3)
{
value = *(ptr->ptrs[i]);
cout<<value;
i++;
}
return;
}
if ( *(ptr->val1) < *(ptr->val2) ){

return rsort(ptr->left);
}
else{

return rsort(ptr->right);
}
}


int sort3(int vala,int valb, int valc)
{

a = vala;
b = valb;
c = valc;

rsort(&node11);
}




int main()
{
sort3(5,5,1);

return 0;


}
template <class T>
bool is_valid(const T& tMin, const T& tMax, const T& number)
{
return number <= tMax && number >= tMin ? true : false;
}

template <class T>
T get_number(const string& strPrompt, const T& tMin, const T& tMax)
{
bool bContinue = false;
cout << strPrompt;
T tRet;
do {
cin >> tRet;
bContinue = !is_valid(tMin, tMax, tRet);
if (bContinue) {
cout << "Range: " << tMin << " <= x <= " << tMax << endl;
}
} while(bContinue);
return tRet;
}

double get_base(double& a, double& b)
{
a = get_number("a: ", 1.0, 30.0);
b = get_number("b: ", 1.0, 30.0);
return sqrt(a * a + b * b);
}
int quadratic(int a, int b, int c, double &r1, double &r2)
{
if(pow(b,2)-4*a*c < 0)
{
cout << "Non real result"<<endl;
return -1;
}
else
{
r1= (-b + sqrt( pow(b,2) - 4*a*c)) /(2*a);

r2= (-b - sqrt(pow(b,2) - 4*a*c)) /(2*a);
return 1;
}
}

unsigned long trib( unsigned int n )
{
return ( ( n < 3 ) ? 1 : trib( n - 1 ) + trib( n - 2 ) + trib( n - 3 ) );
}
int main()
{
char letter; //Below begins the outputs to execute the functions

cout << "This program allows you to execute five functions.\n\n Options Menu:";
cout << "Enter 'a' to compute period.\n Enter 'b' to compute sort 3.\n Enter 'c' to compute triplets.\n Enter 'd' to compute a Quadratic Equation.\n Enter "e" to compute unsigned long.\n";
cout << "Enter the letter from the options menu for your desired function: ";
cin >> letter;

letter = toupper (letter);

while (!cin.eof())
{
switch(letter)
{
case 'A': periodIO();
break;
case 'B': sort3IO();
break;
case 'C': tripletsIO();
break;
case 'D': quadraticEquationIO();
break;
case 'E': unsignedLongIO();
break;

}

cout << "";
cin >> letter;
letter = toupper (letter);
}

return 0;
}