I am having trouble making this menu, I followed some instructions online but I can't seem to get it to loop back to the menu after I am done with a menu selection. Please Help!

```
#include <iostream>
#include <string>
#include <cmath>
using namespace std;
int main ()
{
int choice;
int loop=1;
while(loop==1)
{
system ("CLS");
cout << "****Patrick's Menu of Things****\n\n"
<< "1. Pythagorean Theorem Calculator v1.2\n"
<< "2. Area of a Triangle Calculator\n"
<< "3. Distance Calculator(XY Plane)\n"
<< "4. Another Thing\n"
<< "5. A Fifth Thing\n"
<< "6. **Exit**\n\n";
cin >> choice;
switch(choice)
{
case 1:
system ("CLS");
cout << "PYTHAGOREAN THEOREM CALCULATOR" << endl;
cout << "ENTER BOTH LEGS OF THE TRIANGLE" << endl;
int a, b;
float C;
cout << "LEG 1:";
cin >> a;
cout << "LEG 2:";
cin >> b;
C = sqrt ( ( a * a ) + ( b * b ) );
cout << "THE HYPONTENUSE IS:" << C << endl;
system ("PAUSE");
case 2:
system ("CLS");
cout << "TRIANGLE AREA CALCULATOR" << endl;
cout << "ENTER BASE AND HEIGHT OF TRIANGLE:" << endl;
int h, c;
cout << "BASE:";
cin >> b;
cout << "HEIGHT:";
cin >> h;
cout << "PROCESSING!" << endl;
c = ( b * h ) / 2;
cout << "THE AREA OF THE TRIANGLE IS:" << c << endl;
system("PAUSE");
case 3:
system ("CLS");
cout << "DISTANCE FORMULA CALCULATOR" << endl;
cout << "ENTER THE TWO COORDINATES HERE" << endl;
float X, Y, x, y, Distance;
cout << "ENTER FIRST COORDINATE(LEAVE A SPACE BETWEEN X AND Y):";
cin >> X >> Y;
cout << "ENTER SECOND COORDINATE(LEABE A SPACE BETWEEN X AND Y):";
cin >> x >> y;
Distance = sqrt(pow((X - x),2) + pow((Y - y),2));
cout << "THE DISTANCE IS:" << Distance << endl;
system("PAUSE");
case 4:
system ("CLS");
cout << "You Suck\n";
system ("PAUSE");
case 5:
system ("CLS");
cout << "You Suck More\n";
system ("PAUSE");
case 6:
if(choice==6)
{
exit(0);
}
}
}
}
```