Trying to have my Calculator go on infinite loop

[Magikarp3]

The line with For ( It says that h doesn't name a type.

  #include <iostream>
#include <cstdlib>
using namespace std;

int main ();
int x;
int y;
int x2;
int y2;
int x3;
int y3;
int x4;
int y4;
int n;
int c;
int Mode;
int h;


    for ( int h = 0; h > 10; h=h ) {

	cout << "Welcome to Brian's Calculator!";
	cout << endl;
	cout << "Pick a mode.";
	cout << endl;
 	cout << "1 is Addition.";
 	cout << endl;
 	cout << "2 is Subtraction.";
	cout << endl;
	cout << "3 is Multiplication.";
	cout << endl;
	cout << "4 is Division.";
	cout << endl;
	cout << "5 for Pi!";
	cout << endl;
	cout << "6 to square a number. (n*n)";
	cout << endl;
	cout << "7 to find the circumference of a circle.";
	cout << endl;
 	cout << endl;
	cin >> Mode;
	
	if (Mode==1){
		cout << endl;
	cout << "You chose addition.";
		cout << endl;
   cout << "Pick a number.";
	cout << endl;
	cin >> x;
	cout << endl;
	cout << "Pick another.";
	cout << endl;
	cin >> y;
	cout << endl;
	cout << "The sum of the numbers you chose are: " << x+y <<".";
cin.get();
cin.get();
return 0;	
   }
   
    if (Mode==2){
    	cout << endl;
		cout << "You chose subtraction.";
		cout << endl;
		 cout << "Pick a number.";
	cout << endl;
	cin >> x2;
	cout << endl;
	cout << "Pick another.";
	cout << endl;
	cin >> y2;
	cout << endl;
	cout << "The difference of the numbers you chose are: " << x2-y2 <<".";
cin.get();
cin.get();
	return 0;
	};

 	if (Mode==3){
 		cout << endl;
		cout << "You chose Multiplication.";
		cout << endl;
		 cout << "Pick a number.";
	cout << endl;
	cin >> x3;
	cout << endl;
	cout << "Pick another.";
	cout << endl;
	cin >> y3;
	cout << endl;
	cout << "The product of the numbers you chose are: " << x3*y3 <<".";
cin.get();
cin.get();
	return 0;
	};
	
	 if (Mode==4){
	 	cout << endl;
		cout << "You chose Division.";
		cout << endl;
		 cout << "Pick a number.";
	cout << endl;
	cin >> x4;
	cout << endl;
	cout << "Pick another.";
	cout << endl;
	cin >> y4;
	cout << endl;
	cout << "The quotient of the numbers you chose are: " << x4/y4 <<".";
	cin.get();
cin.get();
	return 0;}
	
	if (Mode==5) {
		cout << endl;
	cout << "Pi is 3.1415926535897932384.";
cin.get();
cin.get();
	}
	
	if (Mode==6) {
		cout << endl;
		cout << "You wished to square a number.";
		cout << endl;
		cout << "Pick a number to square.";
		cout << endl;
		cin >> n;
		cout << endl;
		cout << n << " squared is: " << n * n <<".";
	cin.get();
cin.get();
		return 0;}
		
	if (Mode==7) {
		cout << endl;
		cout << "Enter the diameter of the circle.";
		cout << endl;
		cout << endl;
		cin >> c;
		cout << endl;
		cout << "The circumference is: " << c * 3.14 <<".";
	cin.get();
cin.get();
		return 0;}

		
	

	if (Mode>7) { 
	   cout << endl;
 	   cout << "I'm sorry. I don't understand...";
 	   cout << endl;
 	   cout << "Try again.";
 	   cin.get();
cin.get();
 	   return 0;}
 	   
	}
	} while o >= 0;
	
	return 0;

[wildblue]

line 5 - remove the semicolon and add an opening { for the main function.

You only need one return 0 at the end of main.

Edit:

for ( int h = 0; h > 10; h=h )

If h starts at 0, it won't be greater than 10 to run this.

} while o >= 0;

There's a closing while for a do..while loop, but no do.

[xenovia12]

line 159 should have change into this while( o >= 0)
if you are doing do-while loop you need to have do in line 22 otherwise just parenthesis.

line 5 remove the semicolon (hehe i often put a semicolon on main function too)
you could move the int main() in line 19 if you want the declaration to be global variables