Help! Beginner Programmer....

Hey, this is my first post, and I am a beginner programmer, just started learning C++ a week ago. This is my first program, but i can not tell what is wrong...

Objective:
make a menu
user types number
runs program
***returns to menu (how do i do this?)

My Error/s:
I had them all (IF... IF.... IF....) and whatever value I put in the menu, it would only display the first one (addition). I changed it to (IF... ELSE IF.... ELSE IF...) and now i cant compile, because i have errors... (expected primary expression before "else" and expected ";" before "else") for each place where i have ELSE IF...

this is my code...

Code:

//Mathematics

//Library
#include <iostream>
#include <iomanip>
#include <conio.h>
#include <cstdio>
#include <cmath>

//Const

//Var
using namespace std;
double ratep, rate, principle, years, x, x1, x2, x3, y, y2, y3, y4, z, z1, z2, z3;
int X;

//Main
int main ()

{
 cout << "######## Mathematics ########" << endl;
 cout << "(C) 2010-2011" << endl;
 cout << " " << endl;
 cout << "Type The Number and Press Enter..." << endl;
 cout << " " << endl;
 cout << "(1): Addition" << endl;
 cout << "(2): Subtraction" << endl;
 cout << "(3): Multiplication" << endl;
 cout << "(4): Division" << endl;
 cout << "(5): Simple Interest Calculator" << endl;
 cout << "(6): Credits" << endl;
 cout << "(7): Quit" << endl;
 cin >> X;

if (X==1);
  {
  //Addition
  
  cout << " " << endl;
  cout << "Addition" << endl;
  cout << "X+Y=Z" << endl;
  cout << "What is X?" << endl;
  cin >> x;
  cout << "What is Y?" << endl;
  cin >> y;
  double z (x+y);
  cout << "Z equals to " << z << endl;
  cin.get();
  cin.get();
  return(0);  
  };
else if (X==2);
  {
  //Subtraction
  
  cout << " " << endl;
  cout << "Subtraction" << endl;
  cout << "X-Y=Z" << endl;
  cout << "What is X?" << endl;
  cin >> x1;
  cout << "What is Y?" << endl;
  cin >> y2;
  double z1 (x1-y2);
  cout << "Z equals to " << z1 << endl;
  cin.get();
  cin.get();
  return(0);
  };
else if (X==3);
  {
  //Multiplication
  
  cout << " " << endl;
  cout << "Multiplication" << endl;
  cout << "X*Y=Z" << endl;
  cout << "What is X?" << endl;
  cin >> x2;
  cout << "What is Y?" << endl;
  cin >> y3;
  double z2 (x2*y3);
  cout << "Z equals to " << z2 << endl;
  cin.get();
  cin.get();
  return(0);
  };
else if (X==4);
  {
  //Division
  
  cout << " " << endl;
  cout << "Division" << endl;
  cout << "X/Y=Z" << endl;
  cout << "What is X?" << endl;
  cin >> x3;
  cout << "What is Y?" << endl;
  cin >> y4
  double z3 (x3/y4);
  cout << "Z equals to " << z3 << endl;
  cin.get();
  cin.get();
  return(0);
  };
else if (X==5); 
  {
  //Simple Interest Calculator
  
  cout << " " << endl;
  cout << "Interest Calculator-Simple" << endl;
  cout << "What is the Principle? ($)" <<endl;
  cin >> principle;
  cout << "What is the Rate? (%)" << endl;
  cin >> ratep;
  double rate = (1+(ratep/100));
  cout << "What is the rate of time? (Years)" << endl;
  cin >> years;
  cout << "The New Value of $" << principle << " at " << ratep << "% after " << years << " years:" << endl;
  cout << principle*rate*years << endl;
  cin.get();
  cin.get();
  return(0);
  };
else if (X==6);
  {
  //Credits
   
  cout << " " << endl;
  cout << "Mathematics" << endl;
  cout << "(c) 2010-2011" << endl;
  cin.get();
  cin.get();
  return(0);  
  };
else if (X==7);
  {
  //Exit
  
  cout << "Terminating Program" << endl;
  cout << "Mathematics" << endl;
  cout << "(c) 2010-2011" << endl;
  cin.get();
  cin.get();
  return(0);
  };
};

I Appreciate the HELP!

The correct syntax is

Code:

if (exp) {

} else if (exp2) {

}

You are doing

Code:

if (exp); {

}; else if (exp2); {

}

That's what I saw so far, aside from the programming design and logic.

Thank you so much! My program now works. may i ask, do you know how i could make the program return back to the main menu after completing the set task?

again, thank you so much!

Try something like

Code:

X = 0
while (X != 7) {
  X = call_menu()
}

i.e. put everything inside a while whose stopping condition is the quit entry.

Hope this helps.

I always used switch case while doing these and it really makes it real easy.

Also, global variables are bad. Move all your variables into the main function.

And you really don't need to declare all variables at top. Declare them as locally as possible instead. If you're inputting two numbers, declare them just before reading them. It reduces clutter.